Research activity information

• Jun. 2024 Soils and Foundations, 2023 Editorial Board Member Award

  Yutaka Sawada


• Nov. 2023 国際ジオシンセティックス学会日本支部, 技術奨励賞, GCLを用いたため池堤体に関するこれまでの研究と設計・施工マニュアルの確立に向けた取り組み

  小田哲也, 澤田豊, 泉明良, 堀俊和, 河端俊典


• Oct. 2022 神戸大学農学部六篠会, 六篠業績賞, 大規模な実験によるため池等の耐震性評価とGCLによる対策技術開発に関する一連の研究

  澤田 豊


• Aug. 2021 公益社団法人農業農村工学会, 研究奨励賞, 大規模な実験によるため池等の耐震性評価とGCLによる対策技術開発に関する一連の研究

  澤田豊


• Jun. 2020 公益社団法人地盤工学会, 論文賞（英文部門）, Seismic performance of small earth dams with sloping core zones and geosynthetic clay liners using full-scale shaking table tests

  澤田 豊, 中澤 博志, 小田 哲也, 小林 成太, 澁谷 啓, 河端 俊典

  International society


• Jan. 2016 公益社団法人 農業農村工学会材料施工部会, 研究奨励賞, Pore Water Pressure and Liquefaction in Saturated Sand Bed Induced by Tsunami

  澤田 豊

  Japan society


• Nov. 2012 ジオシンセティックス学会日本支部, 技術奨励賞, ジオグリッドによる圧力管屈曲部の耐震化工法の研究開発

  河端 俊典, 澤田 豊, 毛利栄征

  Japan society


• Sep. 2011 公益社団法人農業農村工学会, 優秀論文賞, 圧力曲管部スラスト防護工法の設計手法の提案

  澤田 豊, 河端 俊典, 毛利 栄征

  Japan society


• Dec. 2004 ジオシンセティックス学会日本支部, 論文奨励賞, ジオグリッドを用いた圧力管路曲管部スラスト防護工法に関する実験

  澤田 豊

  Japan society

• Shaking Table Tests on Geocell-Based Countermeasures against Pipe Flotation

  Taishi Nagatani, Ruka Ikebata, Yusuke Sonoda, Shuji Ito, Yutaka Sawada

  This study investigates the effectiveness of the geocell-based countermeasures against pipe flotation in liquefied ground using shaking table tests. Liquefaction-induced pipe flotation is a significant issue, particularly for agricultural pipelines, which are often installed in areas with high groundwater level. A conventional method, such as using geotextiles combined with gravel, is effective in mitigating this problem. However, the conventional method includes challenges in terms of workability, presenting a need for more efficient solutions. We propose a novel approach that employs geocells to enhance resistance against pipe flotation while potentially reducing labor costs. Geocells, which can be transported in a compact form and expanded on-site, are filled with soil or gravel to form a robust reinforcement around the pipe. This method is expected to offer significant advantages in terms of ease of installation and overall cost-effectiveness. To validate the effectiveness of the proposed method, we conducted shaking table tests using an aluminum pipe buried in saturated sand within a steel container. In this study, four different experimental cases were conducted: an unreinforced case, a case for the conventional geotextile method, and two cases for the geocell reinforcement. For the two cases with geocell reinforcement, the two experimental conditions were varied in the method of fixing the geocells and in the backfill material around the pipe. The results demonstrated that all conventional and geocell-reinforced methods significantly reduced pipe flotation compared to the unreinforced method. Compared to the unreinforced case, the case for the geocell reinforcement reduced pipe flotation by 24.6 times, and the conventional method reduced it by 13.6 times. In conclusion, the proposed method using geocells to prevent pipe flotation in liquefied ground has been confirmed as an effective alternative to the conventional method. This study provides a practical and labor-saving solution for improving the seismic resistance of buried pipelines in earthquake-prone areas.

  Corresponding, Ahli Teknik Tanah Indonesia, Dec. 2024, Indonesian Geotechnical Journal, 3(3) (3), 71 - 80, English, International magazine

  [Refereed][Invited]

  Scientific journal


• Lateral force–displacement relationships for shallowly buried pipe reinforced by geocells

  Yutaka Sawada, Megumi Kitada, Hoe I. Ling, Toshinori Kawabata

  Emerald, Oct. 2024, Geosynthetics International, 31(5) (5), 638 - 651, English, Co-authored internationally

  [Refereed]

  Scientific journal


• Flume model test on the behavior of debris flows into the reservoir and the impact pressure acting on the dam embankment

  Yusuke Sonoda, Yutaka Sawada

  Abstract The number of cases of damage to reservoirs due to debris flows has increased. In this study, granular material was released down the slope in a flume model to observe the debris flow morphology in a reservoir and to examine the impact pressure on a model dam embankment. The model flume had a slope angle of 30°, slope section width of 300 mm, and reservoir section width of 800 mm, and a model embankment with pressure and water pressure gauges was installed. Several experiments were conducted by varying the grain size of the granular materials to 3, 6 mm, mixed, and initial water storage levels. Observations from a high-speed camera indicate that when the debris flow enters the reservoir, the momentum rapidly decreases immediately after inflow. However, a solitary wave was generated, with heights reaching up to 2.5 times the initial water level. Additionally, during the impact of the debris flow on the model embankment, a large impact pressure was instantaneously generated. The magnitude and frequency of the occurrence tended to be more pronounced when the grain size was large. Additionally, the instantaneous impact pressure reached approximately twice the average impact pressure. However, with the exception of instantaneous large impact pressures, the existing equations used in the design of Sabo dams and coefficients with a specific range proposed in previous studies can be used to successfully calculate the impact pressure acting on the embankment in relation to the velocity.

  Corresponding, Springer Science and Business Media LLC, Aug. 2024, Paddy and Water Environment, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Centrifuge Model Studies on the Mechanical Behavior of a Buried Pipe with Voids Surrounding the Bottom and the Effectiveness of EPS as a Countermeasure

  Yusuke Sonoda, Yutaka Sawada, Hoe I. Ling, Liming Li, Toshinori Kawabata

  Corresponding, American Society of Civil Engineers (ASCE), Aug. 2024, Journal of Geotechnical and Geoenvironmental Engineering, 150(8) (8), English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A Labor-Saving Method of Pipe Uplifting Countermeasure with Geocell-Geotextile Combination

  Taishi Nagatani, Yutaka Sawada, Ruka Ikebata, Shuji Ito, Yusuke Sonoda, Toshinori Kawabata

  Abstract In this study, we proposed a new method which mitigates pipe uplifting by utilizing geocells and geotextiles. The method resulted in labor saving in construction. To verify the effectiveness of the proposed method, we reproduced pipe uplift by conducting push-up tests using a 150-mm-diameter pipe. The test results showed that the proposed method increased the peak resistance and the resistance at large displacement by 1.47 and 3.35 times, respectively, compared to the unreinforced method. The proposed method also increased the peak resistance by 1.13 times compared to the conventional method widely used in Japan. It demonstrated consistently high resistance even after the peak. This indicated that the proposed method is very effective as a countermeasure against pipe uplift. Furthermore, increasing the overall width of the geocell improved the resistance. In this study, two different approaches were used to evaluate the uplift resistance of the pipe. The approaches showed that, with geocell reinforcement, most of the dead weight at the pipe sides and above them contributed to the peak resistance. It was also found that the peak resistance of the proposed method can be predicted to some extent by modifying the previously proposed equation.

  Corresponding, Springer Science and Business Media LLC, Jun. 2024, Transportation Infrastructure Geotechnology, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• New geocell utilisation as a pipe uplifting countermeasure and its validation using model experiments

  Taishi Nagatani, Yutaka Sawada, Yusuke Inoue, Shuji Ito, Hoe I. Ling, Toshinori Kawabata

  Corresponding, Elsevier BV, Jun. 2024, Geotextiles and Geomembranes, 52(3) (3), 319 - 331, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal


• ベントナイト系遮水シートを用いて改修されるため池堤体上流側覆土の安定計算に関する検討

  小田 哲也, 澤田 豊, 前田 真宏, 野村 純数, 福永 隼也, 泉 明良, 堀 俊和

  Corresponding, Dec. 2023, ジオシンセティックス論文集, 38, 56 - 61, Japanese, Domestic magazine

  [Refereed]

  Scientific journal


• Modelling a geosynthetic clay liner in a centrifuge and its application to the dynamic stability of small-sized earth-fill dams

  Yutaka Sawada, Akira Izumi, Toshikazu Hori, Haruki Abe, Ruka Ikebata

  Elsevier BV, Dec. 2023, Soil Dynamics and Earthquake Engineering, 175, 108258 - 108258, English, International magazine

  [Refereed]

  Scientific journal


• Strategic coastal dike shape for enhanced tsunami overflow reduction

  Naoki Takegawa, Yutaka Sawada, Noriyuki Furuichi

  Public Library of Science (PLoS), Oct. 2023, PLoS ONE, 18(10 October) (10 October), e0292930 - e0292930, English, International magazine

  [Refereed]

  Scientific journal


• Examining SGF orientation in polyethylene reinforced with short glass fibers pipe

  Mitsuaki Tokiyoshi, Yutaka Sawada, Yasuhiko Otsuki, Kensei Inoue, Takashi Kuriyama, Toshinori Kawabata

  Sep. 2023, Proceedings of the 21st Plastic Pipes Conference, 1 - 11, English, International magazine, Co-authored internationally

  [Refereed]

  International conference proceedings


• Improved Thrust Restraint Design Considering Displacement of Pipe Bend and Joint Separation

  Yoko Ohta, Yutaka Sawada, Megumi Kitada, Toshinori Kawabata

  Corresponding, May 2023, Journal of Pipeline Systems Engineering and Practice, 14(2) (2), English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Geocell Reinforcements for Pipe Bends Under Lateral Loading

  Megumi Kitada, Yutaka Sawada, Toshinori Kawabata

  Corresponding, Feb. 2023, Transportation Infrastructure Geotechnology, 10(1) (1), 82 - 97, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• 既設水路壁による管路屈曲部スラスト対策効果とジオグリッドによる水路壁補強効果の検討

  太田 遥子, 永谷 太志, 澤田 豊, 河端 俊典

  Corresponding, Dec. 2022, ジオシンセティックス論文集, 37, 1 - 8, Japanese, Domestic magazine

  [Refereed]

  Scientific journal


• Model Experiments on Resistant Mechanisms of Thrust Countermeasures for Pipe Bends in Liquefied Ground

  Ohta, Y, Nagatani, T, Kitada, M, Sawada, Y, Kawabata, T

  Nov. 2022, Proceedings of the 7th Asian Regional Conference on Geosynthetic on Hazard’s Risk Management, Innovation, and Sustainability, English

  [Refereed]

  International conference proceedings


• Small-sized Buried Model Tests on Effectiveness of EPS Pipe Foundation

  Sonoda, Y, Kawamura, M, Sawada, Y, Kudo, H, Kawabata, T

  Nov. 2022, Proceedings of the 7th Asian Regional Conference on Geosynthetic on Hazard’s Risk Management, Innovation, and Sustainability, Reference No. N-009, English

  [Refereed]

  International conference proceedings


• MODEL TESTS ON EFFECTIVENESS OF EPS FOUNDATION AS A COUNTERMEASURE AGAINST INSUFFICIENT COMPACTION AROUND BURIED PIPE

  SONODA Yusuke, SAWADA Yutaka, IKAWA Chihaya, TAKAHARA Gentaro, KAWABATA Toshinori

  It is difficult to backfill and compact the narrow space in the bottom side of the pipe and ensure sufficient quality. Insufficient backfilling may cause unexpected deformation and stress concentration in the pipe. In this study, a method of installing EPS as a pipe foundation was proposed, and its effectiveness was examined through a model experiment using 300 polyethylene pipes. The results showed that, when EPS is installed, depending on its geometry, slightly larger strains may occur at the bottom of the pipe or at the contact point between the pipe and EPS, but these strains are significantly smaller than the strain concentrations caused by insufficient backfilling and are not large enough to cause pipe failure, indicating the effectiveness of the EPS as a pipe foundation.

  Corresponding, Japan Chapter of International Geosynthetics Society, Oct. 2022, Geosynthetics Engineering Journal, 37, 85 - 92, Japanese

  [Refereed]

  Scientific journal


• Effects of gravel layer as thrust restraint for pipe bends subjected to earthquake loading

  Yoko Ohta, Yutaka Sawada, Mitsuru Ariyoshi, Yoshiyuki Mohri, Toshinori Kawabata

  Corresponding, Mar. 2022, International Journal of Physical Modelling in Geotechnics, 22(2) (2), 99 - 110, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Development of Flexible Structural Precast Concrete Conduits for Earth Dams

  Yutaka Sawada, Junichi Arita, Masaki Omori, Mitsuru Ariyoshi, Toshinori Kawabata

  Feb. 2022, Journal of Pipeline Systems Engineering and Practice, 13(1) (1), English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Three-dimensional Deformation Behavior for Buried Pipe Joints Subjected to Local Differential Settlement Using Three-direction Strain Measurement

  Yusuke Sonoda, Yutaka Sawada, Kohei Ono, Yoko Ohta, Toshinori Kawabata

  Corresponding, Aug. 2022, Transportation Infrastructure Geotechnology, English, International magazine

  [Refereed]

  Scientific journal


• Improvement of Calculation for Phreatic Lines in Small Earth Dams

  MATSUMOTO Takeru, SAWADA Yutaka, SHIMIZU Masayoshi, KAWABATA Toshinori

  In recent years, many small earth dams have been retrofitted because of deterioration. The phreatic lines in small earth dams with sloping cores are geometrically calculated with the sectional shape of embankment, the water elevation and the permeability of soil materials in the current design. However, there is possibility that actual phreatic lines and calculated ones are different because of the assumption that the foundation ground is impermeable. In this study, the problems of the calculation method for phreatic line in the current design have been organized based on the results of FEM analysis. As a result, it was found that when the permeability of the sloping core is low, the phreatic line calculated by the design calculation is on the dangerous side, and that the seepage flow of the foundation soil affects the phreatic line. To solve these two problems, we proposed methods to reduce the calculation error of the current design by using functions that include the permeability of each embankment material and to obtain results that are closer to the actual phreatic lines.

  Corresponding, The Japanese Society of Irrigation, Drainage and Rural Engineering, 2022, Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering, 90(2) (2), I_259 - I_266, Japanese, Domestic magazine

  [Refereed]

  Scientific journal


• Development and Performance Evaluation of Rotary Underwater Abrasion Tester

  KANAMORI Takuya, ARITA Junichi, ASANO Isamu, KAWABE Shohei, AOYANAGI Kunio, KAWABATA Toshinori, SAWADA Yutaka, MORI Mitsuhiro

  We developed a rotary underwater abrasion tester that can be applied to high strength concrete materials with a large coarse aggregate. In this study, firstly, we experimentally investigated the test conditions under which the developed tester can generate stable flow and large abrasion action. The results confirmed that (1) a stable water flow can be generated when the initial water level is 40 cm and rotational speed is 70 rpm and (2) a large abrasive force was generated by using an abrasive material in the shape of a prism with a length of 19 mm, width of 19 mm, and height of 20 mm. Secondly, we performed an accelerated abrasion test for concrete and mortar and confirmed the characteristics of abrasion on the specimens. The results indicated that, when dissimilar materials are adjacent to each other, the downstream specimen, where the materials are switched, is affected by the dissimilar materials. Conversely, it was confirmed that a longer flow distance of the same material was effective in reducing the effect of the dissimilar materials.

  The Japanese Society of Irrigation, Drainage and Rural Engineering, 2022, Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering, 90(1) (1), I_139 - I_148, Japanese, Domestic magazine

  [Refereed]

  Scientific journal


• ジオグリッドによる矢板引抜き時のたわみ性管の変形抑制効果について

  園田悠介, 徳増美月, 澤田豊, 河端俊典

  Corresponding, Dec. 2021, ジオシンセティックス論文集, 36, 37 - 44, Japanese, Domestic magazine

  [Refereed]

  Scientific journal


• ジオシンセティッククレイライナーが敷設されたため池堤体の浸潤線設定方法の提案

  澤田 豊, 松本 赳, 井上 和徳, 浦部 朋子, 河端 俊典

  Dec. 2021, 農業農村工学会論文集, 89(2) (2), I_363 - I_369, Japanese

  [Refereed]

  Scientific journal


• Centrifuge modelling of small earth dams subjected to the combined effects of rainfall and earthquakes

  Akira Izumi, Yutaka Sawada, Toshikazu Hori, Riku Maki

  Corresponding, Dec. 2021, Soil Dynamics and Earthquake Engineering, 151, 106963 - 106963, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Dynamic Centrifuge Experiments on Thrust Restraint for Pipe Bend Using Consolidation Method for Backfill Material

  ARIYOSHI Mitsuru, OHTA Yoko, SAWADA Yutaka, MOHRI Yoshiyuki, IZUMI Akira, KAWABATA Toshinori

  The liquefaction of backfill materials induced by earthquake shaking may cause the movement of pipe bend resulting in joint separation. Thus, in order to prevent the movement of pipe bend buried in the site where only backfill material is liquefied, we propose a thrust restraint using soil-cement produced by grouting or mixing cement with sand as a backfill material. Dynamic centrifuge tests were conducted to validate the restrain method. The test results indicate the followings: (1) When only the backfill material is liquefied, the pipe moves mainly within the range of the backfill material and the original ground is barely deformed; and (2) placing the soil-cement as the backfill material around the sides of the pipe along the direction of thrust force can significantly reduce the pipe movement during an earthquake. Even if the excess pore water pressure generated in the sand―which is the backfill material―is transmitted to the soil-cement, which can resist the thrust due to its adhesive force.

  The Japanese Society of Irrigation, Drainage and Rural Engineering, Jul. 2021, Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering, 89(2) (2), I_271 - I_278, Japanese, Domestic magazine

  [Refereed]


• Mitigating tsunami damage by promoting ground erosion

  Naoki Takegawa, Yutaka Sawada, Toshinori Kawabata

  Corresponding, Apr. 2021, Journal of Earthquake and Tsunami, 15(2) (2), English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Scour reduction in sand beds against vertical jets by applying sheet-like countermeasures

  Naoki Takegawa, Yutaka Sawada, Toshinori Kawabata

  Corresponding, Jun. 2021, Marine Georesources and Geotechnology, 39(6) (6), 649 - 658, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Damage characteristics of conduits in irrigation earth dams

  Yutaka Sawada, Junichi Arita, Masaki Omori, Toshinori Kawabata

  Jan. 2021, Paddy and Water Environment, 19(1) (1), 239 - 247, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Changes of Deformation and Earth Pressure for Flexible Pipe during Sheet-Pile Extraction and Effect of the Breadth of Sheet-Pile

  SONODA Yusuke, TOKUMASU Mizuki, SAWADA Yutaka, KAWABATA Toshinori

  Sheet pile construction has often been adopted for installations of pipelines in cases such as limited worksites or high ground water level. However, the sheet-pile extraction is likely to cause significant damage to buried flexible pipe. In the Japanese current design standard for irrigation pipeline, the influence of the sheet-pile extraction is empirically considered only by reducing the coefficient of subgrade reaction e´₀. Thus, the difference in construction conditions is not accurately reflected in the design. In this study, the model tests on the sheet-pile extraction were conducted under the difference conditions of breadth of sheet-pile, using the flexible pipe in which the 20 biaxial load cells were installed circumferentially. As a result, the significant decrease in the earth pressure acting on the pipe and most of the pipe deformation occurred before the lower end of sheet-pile was extracted to the top of pipe. In addition, the wider the breadth between sheet-piles in this study was, the smaller the pipe deflection was, because the reduction of horizontal earth pressure was suppressed and vertical one was decreased.

  Corresponding, The Japanese Society of Irrigation, Drainage and Rural Engineering, 2021, Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering, 89(2) (2), I_379 - I_386, Japanese

  [Refereed]


• MECHANICAL BEHAVIOR OF SHALLOWLY BURIED PIPELINE USING GEOGRIDS DURING SHEET-PILE EXTRACTION

  Toda Mayu, Miyazaki Noritake, Sawada Yutaka, Kawabata Toshinori

  Sheet-piles are used in order to install pipelines. Sheet-pile extraction causes pipe damages such as excessive deformation and cracks. In recent years, it is required that pipelines be buried shallowly because of reduction of construction cost. There are few studies on the influence of construction on the shallowly buried pipe using geogrid. In the present study, model experiments were conducted in order to clarify the influence of sheet-pile extraction on shallowly buried pipe using geogrid. Test results showed that the pipe deformation was small in the case of using geogrid and gravel. However, the reduction of bedding due to the sheet-pile extraction may cause the concentration of earth pressure on the bottom of the pipe.

  Japan Chapter of International Geosynthetics Society, Dec. 2020, Geosynthetics Engineering Journal, 35, 179 - 184, Japanese

  [Refereed]

  Link to Kobe Univ. Repository (Kernel)


• Model tests on the deformation and collapse processes of small earth dams due to earthquakes and rainfall

  Nakazawa, H, Ishizawa, T, Danjo, T, Sawada, Y. Onoue

  Sep. 2020, Proceedings of the 17th World Conference on Earthquake Engineering, English

  [Refereed]

  International conference proceedings


• Seismic performance and numerical simulation of earth-fill dam with geosynthetic clay liner in shaking table test

  Kyungbeom Jeong, Satoru Shibuya, Toshinori Kawabata, Yutaka Sawada, Hiroshi Nakazawa

  Apr. 2020, Geotextiles and Geomembranes, 48(2) (2), 190 - 197, English

  [Refereed]

  Scientific journal


• Geogrid-based countermeasures against scour behind coastal dikes under tsunami overflow

  Naoki Takegawa, Yutaka Sawada, Toshinori Kawabata

  Corresponding, Jan. 2020, Marine Georesources and Geotechnology, 38(1) (1), 64 - 72, English, International magazine

  [Refereed]

  Scientific journal


• Model Experiment for Influence of Sheet Pile Characteristics on Mechanical Behavior of Buried Flexible Pipe

  Mizuki Tokumasu, Yutaka Sawada, Takuya Ishikawa, Ohta Yoko, Toshinori Kawabata

  American Society of Civil Engineers, Aug. 2020, Pipelines 2020: Utility Engineering, Surveying, and Multidisciplinary Topics - Proceedings of Sessions of the Pipelines 2020 Conference, 31 - 39, English

  [Refereed]

  International conference proceedings


• Post-Earthquake Performances of Small Earth Dams with Geosynthetic Clay Liners

  Nakazawa, H., Sawada, Y., Oda, T., Shibuya, S., Kawabata, T.

  Jan. 2020, Journal of the Society of Materials Science, 69(1) (1), 21 - 28, Japanese, Domestic magazine

  [Refereed]

  Scientific journal


• In Situ Water Level Measurement in a Small Earth Dam Repaired with Geosynthetic Clay Liners

  SAWADA Yutaka, MAKI Riku, KAMINOBU Koichi, TANIMOTO Mikio, NAKAZAWA Hiroshi, KAWABATA Toshinori

  In recent years, geosynthetic clay liners (GCLs) have been used for repair of deteriorated small earth dams because of exhaustion of high quality cohesive soils. However, the design method has not been established yet, and the long term performance remains unclear. In this study, in-situ water level measurement has been carried out for about one year in a small earth dam repaired with GCLs to examine the water barrier performance and the phreatic line. In addition to the field measurement, FEM seepage analysis have been performed for this site to estimate the phreatic line. As a result, the water barrier performance of the GCLs sufficiently maintained. Furthermore, it was revealed that the phreatic line rose by more than 1 m due to the heavy rainfall which occurred during this measurement period. As for the numerical analysis, the phreatic line obtained from FEM analysis was good agreement with the observed value, and a comparison of the models with and without GCLs showed the effects of lowering the phreatic line and reducing the leakage.

  The Japanese Society of Irrigation, Drainage and Rural Engineering, Dec. 2019, Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering, 87(2) (2), I_357 - I_363, Japanese

  [Refereed]


• Effect of installation geometry on dynamic stability of small earth dams retrofitted with a geosynthetic clay liner

  Yutaka Sawada, Hiroshi Nakazawa, W. Andy Take, Toshinori Kawabata

  Dec. 2019, Soils and Foundations, 59(6) (6), 1830 - 1844, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal


• Full scale investigation of GCL damage mechanisms in small earth dam retrofit applications under earthquake loading

  Yutaka Sawada, Hiroshi Nakazawa, W. Andy Take, Toshinori Kawabata

  Aug. 2019, Geotextiles and Geomembranes, 47(4) (4), 502 - 513, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Shaking table tests for buried pipe bends with thrust restraints using geogrid and gravel in liquefied ground

  Ohta, Y, Sawada, Y, Kawamura, M, Ono, K, Kawabata, T

  International Society of Ocean and Polar Engineering, Jun. 2019, Proceedings of the 29th International Ocean and Polar Engineering Conference, 2, 2373 - 2377, English

  [Refereed]

  International conference proceedings


• Model Experiments on Influence of Sheet-pile Extraction on Mechanical Behavior of Twin Buried Flexible Pipes

  Toda, M, Sawada, Y, Miyazaki, N, Ishikawa, T, Kawabata, T

  International Society of Ocean and Polar Engineering, Jun. 2019, Proceedings of the 29th International Ocean and Polar Engineering Conference, 2, 2383 - 2387, English

  [Refereed]

  International conference proceedings


• Effects of angle and interface friction of buried pipe bend on lateral resistance force

  Kawamura, M, Sawada, Y, Ohta, Y, Ono, K, Kawabata, T

  International Society of Ocean and Polar Engineering, Jun. 2019, Proceedings of the 29th International Ocean and Polar Engineering Conference, 2, 2378 - 2382, English

  [Refereed]

  International conference proceedings


• ジオグリッドを用いた埋設管スラスト防護工法の形状寸法が付加抵抗力に与える影響について

  Ohta, Y, Sawada, Y, Ono, K, Kawamura, M, Kawabata, T

  国際ジオシンセティックス学会日本支部, Dec. 2018, Geosynthetics Engineering Journal, (33) (33), 55 - 60, Japanese

  [Refereed]

  Scientific journal


• 遠心模型実験を用いた消波ブロック被覆堤の地盤吸出し現象の考察

  Araki, S, Sawada, Y, Miyamoto, J, Ushiyama, H, Tanaka, Y, Kotake, Y

  公益社団法人土木学会, Nov. 2018, 土木学会論文集B2（海岸工学）, 74(2) (2), I_1093 - I_1098, Japanese

  [Refereed]

  Scientific journal


• Seismic Behavior and Numerical Simulation of Earth-fill Dam with Geosynthetic Clay Liner in Shaking Table Test

  Jeong, K, Shibuya, S, Kataoka, S, Baek, J, Kawabata, T, Sawada, Y, Nakazawa, H

  International Geosynthetics Society, Sep. 2018, Proceedings of the 11th International Conference on Geosynthetics, English

  [Refereed]

  International conference proceedings


• Lateral force–displacement prediction for buried pipe under different effective stress condition

  Kohei Ono, Yu Yokota, Yutaka Sawada, Toshinori Kawabata

  Jul. 2018, International Journal of Geotechnical Engineering, 12(4) (4), 420 - 428, English, International magazine

  [Refereed]

  Scientific journal


• Seismic performance of small earth dams with sloping core zones and geosynthetic clay liners using full-scale shaking table tests

  Yutaka Sawada, Hiroshi Nakazawa, Tetsuya Oda, Seita Kobayashi, Satoru Shibuya, Toshinori Kawabata

  Jun. 2018, Soils and Foundations, 58(3) (3), 519 - 533, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Fluid Coupled-DEM Simulation of Lateral Loading Experiment for Buried Pipe in Saturated Sand

  Kohei Ono, Kenji Terada, Yutaka Sawada, Hoe I. Ling, Toshinori Kawabata

  Springer US, Jun. 2018, Transportation Infrastructure Geotechnology, 5(2) (2), 93 - 113, English, International magazine

  [Refereed]

  Scientific journal


• Model Experiments on Influence of the Bending Angles on Lateral Resistance Acting on Buried Pipe Bends

  Ohta,Y, Sawada,Y, Ono,K, Ling, H.I, Kawabata, T

  International Society of Ocean and Polar Engineering, Jun. 2018, Proceedings of the 28th International Ocean and Polar Engineering Conference, 2018-June, 589 - 593, English

  [Refereed]

  International conference proceedings


• 開水路継ぎ目部近傍の土砂吸い出し過程に関する実験的検討

  竹川 尚希, SAWADA YUTAKA, KAWABATA TOSHINORI

  公益社団法人 土木学会, Feb. 2018, 土木学会論文集B1(水工学), 74(4) (4), I_703 - I_708, Japanese

  [Refereed]

  Scientific journal


• Influence of liquefaction on scour behind coastal dikes due to tsunami overflow

  Naoki Takegawa, Yutaka Sawada, Kazuki Murai, Toshinori Kawabata

  Corresponding, Jan. 2018, International Journal of Geotechnical Engineering, 12(1) (1), 40 - 45, English, International magazine

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Shear Strength Characteristics of Internal Bentonite Layer of Needle-Punched GCL Used in Small Earth Dams under Cyclic Loading

  R. Shigemoto, Y. Sawada, R. Maki, T. Kawabata

  American Society of Civil Engineers (ASCE), 2018, Geotechnical Special Publication, 2018-(293) (293), 365 - 372, English, International magazine

  [Refereed]

  Scientific journal


• ベントナイト系遮水シートとため池堤体土のせん断強度特性

  重元 凜太郎, SAWADA YUTAKA, 眞木 陸, KAWABATA TOSHINORI

  国際ジオシンセティックス学会日本支部, Nov. 2017, ジオシンセティックス論文集, 32, 73 - 80, Japanese

  [Refereed]

  Scientific journal


• 津波越流により生じる海岸堤防裏法尻の洗掘形状の簡易推定法

  竹川 尚希, SAWADA YUTAKA, KAWABATA TOSHINORI

   In the 2011 off the Pacific coast of Tohoku Earthquake, massive tsunami caused serious damage to coastal structures, such as coastal dikes and seawalls. One of the failure mechanisms of coastal dikes has been considered as local scour at landward toes of coastal dikes. Therefore, prediction of scour profile is indispensable in order to propose scour countermeasures and design of coastal dikes. In the present study, hydraulic model experiments were conducted to clarify scour process at landward toes of coastal dikes. Furthermore, on the basis of the present experimental results and previous studies, two predictive equations for scour profile behind coastal dikes were examined. It has been revealed that the predictive equation approximately agrees with the results of the experiments and the field survey.

  公益社団法人土木学会, Oct. 2017, 土木学会論文集B2（海岸工学）, 73(2) (2), I_1045 - I_1050, Japanese

  [Refereed]

  Scientific journal


• 実大規模震動実験におけるため池堤体の残留変形調査

  中澤 博志, SAWADA YUTAKA, 小田 哲也, 古林 智宏, 小林 成太, KAWABATA TOSHINORI, SHIBUYA SATORU, KATAOKA SATSUKI, 山下 拓三

   In this study, full-scale shaking table tests for embankments were carried out in order to estimate the earthquake resistance of small earth dams with geosynthetics clay liner for a short supply of clay material which requires sloping core zones at many sites. In the experiment, two types of embankments of 3 m of height were constructed in large soil containers respectively. The dynamic behaviors of embankments were observed by sinusoidal wave of maximum acceleration of 471 Gal. After shaking, several longitudinal cracks without water leakage were occurred at the crest of the embankment with geosynthetics clay liner. Finally, a series of the three-dimensional terrestrial laser measurements was tried to grasp the characteristics on the residual deformations of the embankments. As a result, it was found out that some locations and forms of the cracks can be confirmed relatively. Therefore, it was indicated that three-dimensional terrestrial laser scanner is effective as a utility of the measurement method.

  公益社団法人土木学会, Sep. 2017, 土木学会論文集A1（構造・地震工学）, 73(4) (4), I_815 - I_826, Japanese

  [Refereed]

  Scientific journal


• Model Experiment on Earth Pressure Acting on Buried Pipe during Sheet Pile Extraction

  Terada, K, Takahara, S, Ono, K, SAWADA YUTAKA, KAWABATA TOSHINORI

  ASCE, Aug. 2017, Proceedings of the Pipelines 2017 Conference, English

  [Refereed]

  International conference proceedings


• Effect of Scour Protections against Tsunami Overflow at a Landward Toe of Coastal Dikes

  Takegawa, N, SAWADA YUTAKA, KAWABATA TOSHINORI

  International Society of Offshore and Polar Engineering, Jun. 2017, Proceedings of the 27th International Ocean and Polar Engineering Conference, 976 - 980, English

  [Refereed]

  International conference proceedings


• 動水勾配と載荷速度の変化が埋設管の水平抵抗力に与える影響

  小野 耕平, 横田 木綿, 井谷 昌功, SAWADA YUTAKA, KAWABATA TOSHINORI

  公益社団法人農業農村工学会, Feb. 2017, 農業農村工学会論文集, (304) (304), I_29 - I_35, Japanese

  [Refereed]

  Scientific journal


• Lateral Loading Experiments for Pipe-Soil Interactions in Liquefied Sandy Soil

  Kohei Ono, Yu Yokota, Yoko Ohta, Yutaka Sawada, Hoe I. Ling, Toshinori Kawabata

  American Society of Civil Engineers (ASCE), 2017, Pipelines 2017: Planning and Design - Proceedings of Sessions of the Pipelines 2017 Conference, 44 - 53, English

  [Refereed]

  International conference proceedings


• 地盤のせん断変形を受ける更生埋設管の変形挙動について

  泉 明良, 三木 太貴, SAWADA YUTAKA, KAWABATA TOSHINORI

  In recent years, many irrigation pipelines require a repair work by the deterioration. The aging pipelines have a risk for a leakage, a decrease of a capacity of flow and a serious damage during earthquake. As the repair work for aging pipelines, pipe rehabilitation has been used. However, the dynamic behavior of the rehabilitated pipe during earthquake has not been cleared. In this study, in order to clarify an influence of a shear deformation of grounds on the behavior of the buried rehabilitated pipe, shear tests and DEM analyses were conducted. As the results, it was revealed that the degree of the influence of the aging host pipe on the deformation of the rehabilitated pipe was divided into three types according to the damage levels of the host pipe and the relative density of the backfill material. In addition, the prediction equation on the deformation of the rehabilitated pipe to the shear deformation was proposed in consideration of the damage levels of the host pipe, the deformation modulus of the backfill material and the bending ring stiffness of the rehabilitated pipe.

  公益社団法人 農業農村工学会, Dec. 2016, 農業農村工学会論文集, 84(303) (303), I_241 - I_249, Japanese

  [Refereed]

  Scientific journal


• 前刃金工法および遮水シート工法により改修されたため池堤体の実大規模振動実験

  SAWADA YUTAKA, 中澤 博志, KATAOKA SATSUKI, 小林 成太, 小田 哲也, 古林 智宏, SHIBUYA SATORU, 山下 拓三, 谷 和夫, 梶原 浩一, KAWABATA TOSHINORI

  Lead, ジオシンセティックス学会日本支部, Dec. 2016, ジオシンセティックス論文集, 31, 167 - 174, Japanese

  [Refereed]

  Scientific journal


• 階段状に設置したベントナイト系遮水シートがため池堤体の地震時挙動におよぼす影響

  ODA TETSUYA, SAWADA YUTAKA, NAKAZAWA HIROSHI, KOBAYASHI SEITA, SHIBUYA SATORU, KAWABATA TOSHINORI

  ジオシンセティックス学会日本支部, Dec. 2016, ジオシンセティックス論文集, 31, 175 - 182, Japanese

  [Refereed]

  Scientific journal


• 液状化地盤のせん断抵抗力に与えるジオグリッドの補強効果に関する埋設管の水平載荷実験

  小野 耕平, 横田 木綿, SAWADA YUTAKA, KAWABATA TOSHINORI

  ジオシンセティックス学会日本支部, Dec. 2016, ジオシンセティックス論文集, 31, 261 - 268, Japanese

  [Refereed]

  Scientific journal


• Model experiments and simulations on influence of liquefaction on scour at a landward toe of coastal dykes due to tsunami overflow

  Naoki Takegawa, Yutaka Sawada, Kazuki Murai, Toshinori Kawabata

  CRC Press, Sep. 2016, Scour and Erosion - Proceedings of the 8th International Conference on Scour and Erosion, ICSE 2016, 343 - 348, English

  [Refereed]

  International conference proceedings


• Lateral Loading Experiments for Buried Pipe in Reinforced Ground with Geogrids under Different Hydraulic Gradient

  Ono, K, Yokota, Y, Sawada, Y, Kawabata, T

  Sep. 2016, Proceedings of the 6th European Geosynthetics Congress, 1322 - 1331, English

  [Refereed]

  International conference proceedings


• Lateral Loading Test for Buried Pipe under Different Hydraulic Gradient

  Ono, K, Yokota, Y, SAWADA YUTAKA, KAWABATA TOSHINORI

  International Society of Offshore and Polar Engineering, Jun. 2016, Proceedings of the 26th International Ocean and Polar Engineering Conference, 2016-January, 664 - 669, English

  [Refereed]

  International conference proceedings


• Influence of Effective Stress of Soil on Scour at Landward Toe of Coastal Dykes under Tsunami Overflow

  SAWADA YUTAKA, Takegawa, N, Murai, K, KAWABATA TOSHINORI

  Lead, International Society of Offshore and Polar Engineering, Jun. 2016, Proceedings of the 26th International Ocean and Polar Engineering Conference, 2016-January, 843 - 847, English

  [Refereed]

  International conference proceedings


• Axial Behavior of Buried Rehabilitated Pipe in Liquefaction Ground

  Akira Izumi, Kohei Ono, Syo Takahara, Yutaka Sawada, Toshinori Kawabata

  Springer US, Jun. 2016, Transportation Infrastructure Geotechnology, 3(2) (2), 60 - 73, English, International magazine

  [Refereed]

  Scientific journal


• 地盤のせん断変形がたわみ性埋設管のたわみ量に与える影響

  泉 明良, SAWADA YUTAKA, 三木 太貴, KAWABATA TOSHINORI

  A deformation behavior of a buried flexible pipe used as an irrigational pipeline is not substantially clear during earthquake. In this study, in order to clarify an influence of a deformation of ground on the dynamic behavior of the buried flexible pipe, cyclic shear tests for buried flexible pipes having an outside diameter of 140 mm and 150 mm in the laminar box and DEM analyses were conducted. As the results, it was found that the 45-225 and 135-315 degrees deflection of the buried flexible pipe were larger than the 0-180 deg. (vertical) and 90-270 deg. (horizontal) deflection. This tendency became remarkable as the relative density of the backfill material increased. It was indicated that the relationships between the deflection of the pipe and the shear strain obtained from the analyses results could be in good agreement with the test results. In addition, the buried flexible pipe was deformed due to the contact force acted on the oblique direction of the pipe during earthquake.

  公益社団法人土木学会, Feb. 2016, 土木学会論文集A2（応用力学）, 71(2) (2), I_869 - I_877, Japanese

  [Refereed]

  Scientific journal


• Seismic behavior and numerical simulation of a small-sized earth-fill with bentonite sheet observed in shaking table test

  Jeong Kyung-Beom, Shibuya Satoru, Kataoka Satsuki, Baek Je-Min, Kawabata Toshinori, Sawada Yutaka

  Recently, a bentonite sheet is often employed in deteriorated earth-fill dams for preventing water leakage. However, it is concerned that a slipping type of failure may occur at the boundary between the bentonite sheet and the fill material in the event of seismic attack. In this paper, seismic behavior of a small-sized earth fill model inside which a bentonite sheet was mantled was examined in shaking table test, and it was simulated by numerical analysis. It is manifested in the shaking table test that a shallow slip surface developed in the fill above the bentonite sheet, and no harmful deformation was observed along the bentonite sheet when subjected to seismic motion, noting also that the shallow failure was successfully simulated by pseudo static limit equilibrium analysis. In addition, it was confirmed that the seismic response of the model earth-fill was unaffected by the existence of bentonite sheet as examined by FEM seismic numerical simulations.

  The Japanese Geotechnical Society, 2016, Japanese Geotechnical Society Special Publication, 4(2) (2), 27 - 30, English

  [Refereed]

  International conference proceedings


• Seismic behavior and numerical simulation of a full-scale earth-fill dam in shaking table test

  JEONG KYUNGBEOM, SHIBUYA SATORU, KATAOKA SATSUKI, BAEK JEMIN, KAWABATA TOSHINORI, SAWADA YUTAKA, 中澤 博志

  地盤工学会, 2016, 地盤工学シンポジウム論文集, 60, 249 - 254, Japanese

  [Refereed]

  Symposium


• Model Experiments for the Mechanical Behavior of Buried Rehabilitated Pipes under Eccentric Loading

  S. Takahara, K. Ono, Y. Sawada, T. Kawabata

  American Society of Civil Engineers (ASCE), 2016, Pipelines 2016: Out of Sight, Out of Mind, Not Out of Risk - Proceedings of the Pipelines 2016 Conference, 1698 - 1709, English

  [Refereed]

  International conference proceedings


• DEM Analysis on the Mechanical Behavior of Buried Pipe during Sheet-Pile Extraction

  K. Terada, K. Ono, S. Takahara, T. Miki, Y. Sawada, T. Kawabata

  American Society of Civil Engineers (ASCE), 2016, Pipelines 2016: Out of Sight, Out of Mind, Not Out of Risk - Proceedings of the Pipelines 2016 Conference, 1207 - 1217, English

  [Refereed]

  International conference proceedings


• 補強体を有する混成堤の津波外力作用下の安定性に関する解析的検討

  SAWADA YUTAKA, 三宅 達夫, 宮本 順司, KAWABATA TOSHINORI

  Lead, 公益社団法人土木学会, Nov. 2015, 土木学会論文集C（地圏工学）, 71(4) (4), 352 - 364, Japanese

  [Refereed]

  Scientific journal


• MPS法を用いた津波による海岸構造物背後地盤の洗掘に関する数値解析

  村井 和樹, SAWADA YUTAKA, KAWABATA TOSHINORI

  公益社団法人地盤工学会関西支部, Nov. 2015, Kansai Geo-Symposium 2015 論文集, 7 - 12, Japanese

  [Refereed]

  Symposium


• Numerical Analysis on Stability of Caisson-Type Breakwaters under Tsunami-Induced Seepage

  Yutaka Sawada, Michio Miyake, Junji Miyamoto, Toshinori Kawabata

  Springer US, Sep. 2015, Transportation Infrastructure Geotechnology, 2(3) (3), 120 - 138, English, International magazine

  [Refereed]

  Scientific journal


• Centrifuge Modeling for Mechanical Behavior of Liners in Damaged Host Pipes

  Kohei Ono, Yusuke Sonoda, Yutaka Sawada, Hoe I. Ling, Toshinori Kawabata

  Springer US, Sep. 2015, Transportation Infrastructure Geotechnology, 2(3) (3), 139 - 154, English

  [Refereed]

  Scientific journal


• Effect of Different Exposure Conditions on Degradation Characteristics of Biodegradable Resin Mortar

  Suzuki, M, Kubo, K, Suzuki, T, Sawada, Y, Kawabata, T

  公益社団法人農業農村工学会, Apr. 2015, IDRE Journal, (296) (296), I_19 - I_24, English

  [Refereed]

  Scientific journal


• 横波共振法を適用した農業用パイプラインの機能診断に関する研究

  茨田 匠, 井谷 昌功, SAWADA YUTAKA, KAWABATA TOSHINORI

  Recently, the irrigation pipelines gradually lose its performance due to the deterioration and other factors, and the replacement or the improvement are required. It is necessary to develop a diagnosis technique which is advantage in the cost in order to maintain the performance of the pipeline. In the present study, in order to discuss the application of a shear wave resonating method to the diagnosis technique for ductile iron pipes, several experiments were carried out using an examination object in which the corrosion was simulated. As a result, it is found that the corrosion can be detected by comparing the measurement wave form of normal part and damage part. In addition, in order to evaluate the deterioration degree, the classification method has been proposed on the basis of the power spectrum by the plurality of frequency bands.

  公益社団法人農業農村工学会, Feb. 2015, 農業農村工学会論文集, 83(295) (295), 31 - 38, Japanese

  [Refereed]

  Scientific journal


• 液状化地盤における埋設管の水平抵抗力に関する模型実験

  井谷 昌功, 藤田 信夫, SAWADA YUTAKA, 有吉 充, 毛利 栄征, KAWABATA TOSHINORI

  Generally, the damage of pipeline becomes heavy when liquefaction occurs. However, the seismic behavior of pipeline in the liquefied ground is unknown enough. Therefore, the seismic design are not established systematically. In particular, the thrust force due to internal pressure constantly acts on pipe bend of the pressure line, such as irrigation pipelines. The resistance for the thrust force is passive earth pressure behind the pipe bend, but it is not considered that the passive earth pressure decreases when the liquefaction occurs. In the present study, model experiments were carried out in order to discuss the mechanical behavior of the pipe bend laterally loaded in the liquefied ground. As a result, it was revealed that the horizontal displacement of the pipe is increase and the horizontal resistance force is decrease significantly during liquefaction. In addition, it was found that the coefficient of subgrade reaction in the liquefied ground was reduced to 1/7 to 1/8 compared to that in non-liquefied ground.

  公益社団法人農業農村工学会, Feb. 2015, 農業農村工学会論文集, 83(295) (295), 77 - 83, Japanese

  [Refereed]

  Scientific journal


• DEM analyses on L-shaped breakwaters subjected to lateral loads

  Y. Sawada, T. Kawabata

  Lead, 2015, Computer Methods and Recent Advances in Geomechanics - Proceedings of the 14th Int. Conference of International Association for Computer Methods and Recent Advances in Geomechanics, IACMAG 2014, 1779 - 1784, English

  [Refereed]

  International conference proceedings


• Instability of breakwater foundation during tsunami in a drum centrifuge

  Junji Miyamoto, Michio Miyake, Kazuhiro Tsurugasaki, Hiroko Sumida, Yutaka Sawada, Kenichi Maeda, Tatsuya Matsuda

  2015, Proceedings of the International Offshore and Polar Engineering Conference, 2015-January, 846 - 850, English

  [Refereed]

  International conference proceedings


• Shaking Table Test for Axial Behavior of Buried Inner Rehabilitated Pipes Affected by Aging Pipes in Liquefied Ground

  A. Izumi, K. Ono, S. Takahara, Y. Sawada, M. Ariyoshi, Y. Mohri, T. Kawabata

  American Society of Civil Engineers (ASCE), 2015, Pipelines 2015: Recent Advances in Underground Pipeline Engineering and Construction - Proceedings of the Pipelines 2015 Conference, 316 - 324, English

  [Refereed]

  International conference proceedings


• 防波堤背後の洗掘が水平抵抗力に及ぼす影響

  SAWADA YUTAKA, KAWABATA TOSHINORI

  Lead, 土木学会, Oct. 2014, 土木学会論文集B3（海洋開発）, 70(2) (2), 510 - 515, Japanese

  [Refereed]

  Scientific journal


• 同一環剛性を有する管厚の異なるたわみ性パイプの力学挙動特性

  泉 明良, SAWADA YUTAKA, 日野林 譲二, 毛利 栄征, 有吉 充, KAWABATA TOSHINORI

  公益社団法人 農業農村工学会, Aug. 2014, 農業農村工学会論文集, (292) (292), 231 - 239, Japanese

  [Refereed]

  Scientific journal


• 既設老朽管の損傷レベルが更生管力学挙動に与える影響

  SAWADA YUTAKA, 園田 悠介, 小野 耕平, INOUE KAZUYA, 毛利 栄征, 有吉 充, KAWABATA TOSHINORI

  近年，耐用年数を迎える農業用管路の増加に伴い，非開削での施工が可能な管路更生工法の採用が進展している。しかしながら，更生管の力学挙動は未解明で，設計手法も確立されていない現状にある。更生工法では，老朽化した既設管を撤去せずに管路を更新するため，半永久的に更生管外周に既設管が残存する。本研究では，既設管損傷レベルと荷重条件を変化させた土中埋設実験を実施し，既設管が更生管力学挙動に与える影響について検討した。その結果，既設管損傷レベルの進行に伴い，更生管のたわみが増大することが明らかになった。また，損傷状態によっては，既設管と更生管が点接触することで，局所的に卓越したひずみが発生することがわかった。さらに，地表面偏心荷重の場合，ひずみが卓越する箇所が損傷レベルにより異なることが明らかになった。

  農業農村工学会, Jun. 2014, 農業農村工学会論文集, (291) (291), 25 - 31, Japanese

  [Refereed]

  Scientific journal


• Mechanical Characteristics of Environmetally-friendly Biodegradable Resin Concrete

  Suzuki, M, Kubo, K, SAWADA YUTAKA, KAWABATA TOSHINORI

  Jun. 2014, Cocrete Innovation Conference 2014, 7pages, English

  [Refereed]

  International conference proceedings


• Finite Element Analyses on Mechanical Behavior of Inner Rehabilitated Pipes Affected by Outer Aging Pipes

  Ono, K, SAWADA YUTAKA, Izumi, A, Miki, T, Sonoda, Y, INOUE KAZUYA, KAWABATA TOSHINORI, Ligh, H. I, Hinobayashi, J

  Jun. 2014, Proceedings of the 24th International Ocean and Polar Engineering Conference, 709 - 714, English

  [Refereed]

  International conference proceedings


• Pore Water Pressure and Liquefaction in Saturated Sand Bed Induced by Tsunami

  Yutaka Sawada, Michio Miyake, Hiroko Sumida, Toshinori Kawabata

  Apr. 2014, IDRE Journal, (290) (290), 55 - 62, English, Domestic magazine

  [Refereed]

  Scientific journal


• Lateral Behavior of L-Shaped Breakwaters Subjected to Scour

  SAWADA YUTAKA, KAWABATA TOSHINORI

  Lead, Research Center for Urban Safety and Security, Kobe University, Mar. 2014, Report of Research Center for Urban Safety and Security, 18, 198 - 202, English

  Research institution


• Multi-phase mechanics of the interaction between the soil, water, and coastal structure during the tsunami disaster

  Imase Tatsuya, Maeda Kenichi, Miyake Michio, Tsurugasaki Kazuhiro, Sumida Hiroko, Sawada Yutaka

  American Society of Civil Engineers (ASCE), 2014, Geotechnical Special Publication, 236(236) (236), 528 - 537, English

  [Refereed]

  International conference proceedings


• Centrifuge model test for buried inner rehabilitated pipes affected by aging pipes with different damage levels

  K. Ono, K. Inoue, Y. Sawada, A. Izumi, Y. Sonoda, T. Miki, Y. Mohri, H. I. Ling, L. Li, J. Hinobayashi, T. Kawabata

  American Society of Civil Engineers (ASCE), 2014, Pipelines 2014: From Underground to the Forefront of Innovation and Sustainability - Proceedings of the Pipelines 2014 Conference, 1040 - 1048, English

  [Refereed]

  International conference proceedings


• 防波堤堤頭部の津波に対する粘り強い構造の提案

  SAWADA YUTAKA, 三宅 達夫, 角田 紘子, 鶴ヶ崎 和博, 前田 健一, 今瀬 達也

  Many breakwaters were damaged by the 2011 off Pacific Coast of Tohoku Earthquake Tsunami. Especially the breakwater tilted or turned over due to scour at the rubble mound of the breakwater head and a lack of bearing capacity.
   In this study, in order to discuss the stability of the breakwater head, centrifuge model tests to simulate tsunami flow and a numerical analysis using CADMAS-SURF/3D were conducted. As a result, the rubble mound was enormously scoured due to tsunami flow. In addition, it was shown that the area of scour was predicted with the flow velocity distribution in the numerical analysis and the estimation formula for the stability of the rubble mound.
   Moreover, in this study, some preventions against scouring were suggested and the effect of them was velified by model tests. According to results of model tests, in case of covering over the surface of the rubble mound with the units packed gravels and installing the L-shape block at the corner of mound, it was revealed that the prevention was significantly effective although the rubble mound was partially or locally damaged.

  Lead, 土木学会, Sep. 2013, 土木学会論文集B3（海洋開発）, 69(2) (2), 461 - 466, Japanese

  [Refereed]

  Scientific journal


• 人工干潟造成における粘性土袋詰め潜堤の安定性に関する研究

  鶴ヶ崎 和博, SAWADA YUTAKA, 角田 紘子, 菱沼 由美子, 土田 孝

  In the construction site of tidal flat made of dredged clayey soil, submerged breakwater and seawall are developed at first and coverd sand layer. If the foundation is firmly, submerged breakwater and seawall are able to construct with direct set of gravel. Foundation is soft condition on the contrary, ground improvements are need. In this study, applicability of geotextile bag filled with dredged clayey soil is examined to construct submerged breakwater on soft ground instead of gravel. Centrifuge model tests and numerical analyses were carried out to construct 3m of height of submerged breakwater using geotextile bag on normally consolidated ground.

  土木学会, Sep. 2013, 土木学会論文集B3（海洋開発）, 69(2) (2), 1066 - 1071, Japanese

  [Refereed]

  Scientific journal


• 地震および越流による地盤損傷を考慮した津波力を受ける混成堤の支持力破壊検討

  今瀬 達也, 前田 健一, 三宅 達夫, SAWADA YUTAKA, 鶴ヶ崎 和博, 角田 紘子, 張 峰

  土木学会, Nov. 2012, 土木学会論文集B2（海岸工学）, 68(2) (2), 866 - 870, Japanese

  [Refereed]

  Scientific journal


• 間隙圧の変化に着目した開水路流れ及び越流による洗掘メカニズムの実験的考察

  今瀬 達也, 前田 健一, 伊藤 嘉, 三宅 達夫, 鶴ヶ崎 和博, SAWADA YUTAKA, 角田 紘子

  土木学会, Nov. 2012, 土木学会論文集B2（海岸工学）, 68(2) (2), 836 - 840, Japanese

  [Refereed]

  Scientific journal


• カルシア改質土の管中混合方式による圧送実験

  鶴ヶ崎 和博, 前田 敏, 西 成孝, 高本 忠志, 草刈 成直, SAWADA YUTAKA

  Nov. 2012, 地盤の環境・計測技術に関するシンポジウム論文集, 14, 119 - 124, English

  [Refereed]

  Symposium


• Destabilization of a caisson-type breakwater by scouring and seepage failure of the seabed due to a tsunami

  Imase, T, Maeda, K, Miyake, M, SAWADA YUTAKA, Sumida, H, Tsurugasaki, K

  Aug. 2012, 6th International Conference on Scour and Erosion Proceedings, 807 - 814, English

  [Refereed]

  International conference proceedings


• 遠心模型実験およびSPH法による津波が作用する海岸構造物の被害予測技術開発

  今瀬達也, 前田健一, 三宅達夫, 澤田豊, 角田紘子, 鶴ヶ崎和博

  Mar. 2012, 地盤工学会誌, 60(3) (3), 12 - 14, English

  [Refereed]

  Scientific journal


• CENTRIFUGE MODEL TESTS AND FE ANALYSES FOR A WASTE REPOSITORY USING SAND MASTICS

  YAMASAKI Tomohiro, SAWADA Yutaka, TSURUGASAKI Kazuhiro, ISOGAI Yumiko, FURUICHI Kenji, NONOMURA Chisato, YAMADA Kouichi, KATAOKA Masaki

   Sand mastics, which have flow characteristics at high temperature, are useful for impermeable joints between impermeable sheets and impermeable bed in gentle slope-type seawall for controlled waste disposal. On the other hand, the strength is also dependent on the temperature. In this study, centrifugal model tests and FE analyses for a gentle slope-type seawall with sand mastics have been carried out in order to investigate the strength characteristics, the influence of the geomaterial characteristics and impermeable sheets on the stability.
   From experimental results, it was revealed that deformation of sand mastics was restrained by a constant overburden pressure. In addition, the strength decreased with the decrease of eccentric load due to a weight of the seawall and was evaluated as 2.5 kN/m² at 25 degree. From analytical results, it was shown that the stability of the seawall increased in the case of using geomaterials with large internal friction and impermeable sheets with large friction between geomaterials and sheets.

  Japan Society of Civil Engineers, 2012, Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering), 68(2) (2), I_474 - I_479, Japanese

  [Refereed]

  Scientific journal


• Ｌ型防波堤の安定性に関する遠心力模型実験

  三宅 達夫, SAWADA YUTAKA, 鶴ヶ崎 和博, 菊池 喜昭

  土木学会, Dec. 2011, 土木学会論文集B3（海洋開発）, 67(2) (2), 94 - 99, Japanese

  [Refereed]

  Scientific journal


• サンドマスチックの温度および載荷速度に対する強度特性試験

  山崎 智弘, SAWADA YUTAKA, 横井 敦

  土木学会, Dec. 2011, 土木学会論文集B3（海洋開発）, 67(2) (2), 406 - 410, Japanese

  [Refereed]

  Scientific journal


• LLDPE製遮水シートの折れ曲げ部の品質確認試験

  鶴ヶ崎 和博, 山崎 智弘, SAWADA YUTAKA, 近藤 三樹郎, 鳥居 一春

  This report is the investigation of the mechanical property of bending area of waterproof sheet applied in a coastal confined waste disposal site. Waterproof sheet, used in this investigation, was made of linear-low-densitypolyethylene (LLDPE). One dimensional tensile test and hydraulic bursting test were conducted at varied patterns as the number of bending, bending load and bending time. The result of the investigation, bending did not affect the mechanical properties of LLDPE sheet at the range of this test conditions.

  ジオシンセティックス学会, Dec. 2011, ジオシンセティックス論文集, 26, 127 - 130, Japanese

  [Refereed]

  Scientific journal


• 津波力を受ける捨石マウンド-海底地盤の透水現象に着目した海岸構造物の安定性

  今瀬 達也, 前田 健一, 三宅 達夫, 鶴ヶ崎 和博, SAWADA YUTAKA, 角田 紘子

  土木学会, Nov. 2011, 土木学会論文集A2（応用力学）, 67(1) (1), 133 - 144, Japanese

  [Refereed]

  Scientific journal


• 捨石マウンド－海底地盤への津波浸透による混成堤の不安定化

  今瀬 達也, 前田 健一, 三宅 達夫, 鶴ヶ崎 和博, SAWADA YUTAKA, 角田 紘子

  土木学会, Nov. 2011, 土木学会論文集B2（海岸工学）, 67(2) (2), 551 - 555, Japanese

  [Refereed]

  Scientific journal


• 液状化地盤内における内圧管路屈曲部スラスト防護工法の動的挙動に関する検討

  KAWABATA TOSHINORI, SAWADA YUTAKA, 毛利 栄征, LING Hoe I

  Sep. 2011, 土木学会論文集C（地圏工学）, 67(3) (3), 399 - 406, Japanese

  [Refereed]

  Scientific journal


• 津波が作用する可動式L型防波堤に関する遠心模型実験

  三宅 達夫, SAWADA YUTAKA, 角田 紘子, 鶴ヶ崎 和博

  In this study, centrifuge tests and numerical analyses for a movable L-shape breakwater subjected to tsunami were conducted in order to discuss the wave pressure. As a result of tests, it was revealed that the movable L-shape breakwater was stable for tsunami due to the vertical water pressure acting on the upper surface of the breakwater. In addition, the up-lift force was reduced from 30 to 40 % using an impermeable sheet. The level and the distribution of wave pressure in centrifuge tests were in good agreement with the results of numerical analyses. Furthermore in this study, the simple method to estimate the wave pressure was suggested. The suggested estimation method was also in good agreement with the test results.

  土木学会, Nov. 2010, 土木学会論文集B2（海岸工学）, 66(1) (1), 791 - 795, Japanese

  [Refereed]

  Scientific journal


• アスファルト混合物の温度および変位速度に対する強度特性試験

  山崎 智弘, SAWADA YUTAKA, 横井 敦

  土木学会, Jun. 2010, 海洋開発論文集, 26, 1029 - 1034, Japanese

  [Refereed]

  Scientific journal


• Design for Lightweight Thrust Restraint of Pipe Bend

  SAWADA Yutaka, KAWABATA Toshinori, MOHRI Yoshiyuki

  In bends of pressure pipelines, thrust forces generated due to internal pressure. Thrust forces act on the bends outward and tend to move the bends. In our previous study, a lightweight thrust restraint using geogrids and an anchor plate was proposed. In addition, the advantage of the proposed thrust restraint was verified by laboratory model tests and full-scale tests and the resistance mechanism was revealed by numerical analyses. Based on the failure mechanism, the maximum lateral resistance was evaluated by solving equations for the force equilibrium. In the present study, the lateral resistance of the proposed method was formulated considering the tensile characteristics of the geogrid. In addition, the calculated results were compared with the experimental results in order to verify the accuracy of the proposed formula. As results, it was revealed that the lateral resistance can be evaluated by the proposed formula. Furthermore the design method for the lightweight thrust restraint was suggested.

  Lead, The Japanese Society of Irrigation, Drainage and Rural Engineering, Feb. 2010, Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering, 78(1) (1), 33 - 40, Japanese

  [Refereed]

  Scientific journal


• Field verification test for buried bend with lightweight thrust restraint using geogrid

  T. Kawabata, A. Izumi, A. Kashiwagi, T. Hanazawa, S. Okuno, M. Suzuki, Y. Sawada

  May 2010, 9th International Conference on Geosynthetics - Geosynthetics: Advanced Solutions for a Challenging World, ICG 2010, 1327 - 1332, English

  [Refereed]

  International conference proceedings


• Lateral loading experiment on buried pipe using liquefied stabilized soil as backfill material for thrust restraint

  Toshinori Kawabata, Ayumu Kashiwagi, Yutaka Sawada, Satoshi Okuno, Hoe I. Ling, Yoshiyuki Mohri

  2010, Pipelines 2010: Climbing New Peaks to Infrastructure Reliability - Renew, Rehab, and Reinvest - Proc. of the Pipelines 2010 Conference, 386, 1244 - 1254, English

  [Refereed]

  International conference proceedings


• ジオグリッドを用いた軽量スラスト防護工法の現場実証実験

  KAWABATA TOSHINORI, SAWADA YUTAKA, 泉明 良, 柏木 歩, 花澤 貴文

  Thrust forces are generated at bend pipes due to internal water pressures. Generally concrete blocks are installed at bends to resist thrust forces. However, it has been reported that concrete blocks were one of the weak spots of the pipe system during earthquake. To improve the pipe system during earthquake, we previously proposed to replace concrete blocks with a lightweight thrust restraint technique using geogrids. In this study, the field test on the lightweight thrust restraint for buried bend pipe was carried out in order to examine the behavior of the bend pipe in the field. From the test results, it was found that the steel bend pipe with the proposed method performed satisfactorily under internal water pressures.

  ジオシンセティックス学会日本支部, Dec. 2009, ジオシンセティックス論文集, 24, 165 - 170, Japanese

  [Refereed]

  Scientific journal


• 圧力管曲部の軽量スラスト防護工法の実規模埋設実験

  KAWABATA TOSHINORI, SAWADA YUTAKA, 毛利 栄征

  農業農村工学会, Aug. 2009, 農業農村工学会論文集, (262) (262), 111 - 117, Japanese

  [Refereed]

  Scientific journal


• Field Test on Lightweight Thrust Restraint for Buried Bend

  KAWABATA TOSHINORI, Hanazawa, T, SAWADA YUTAKA, Izumi, A, Kashiwagi, A, Shigenaka, A, Nanno, I

  Jun. 2009, Proceedings of 19th International Offshore and Polar Engineering Conference, 2, 62 - 66, English

  [Refereed]

  International conference proceedings


• Evaluation for Additional Resistance by Lightweight Thrust Restraint on Pressure Pipe Bend

  SAWADA Yutaka, KAWABATA Toshinori, MOHRI Yoshiyuki, UCHIDA Kazunori

  Thrust force acts on pipe bend due to internal pressure. In previous study, the lightweight thrust restraint with geogrid and anchor plate has proposed and the effect has been proved by conducting lateral loading model tests. In the present study, a series of model tests for changing depth of cover and length of restraint were carried out, and image analysis for the ground surface in the model tests were carried out to discuss the failure mechanism of proposed method. Furthermore, the failure mechanisms in front of the anchor plate were assumed and the additional resistances due to the proposed method were calculated based on the force equilibrium. In addition, in order to examine the accuracy for the proposed formula, calculated values were compared with experimental values. As the results, additional resistance from calculation was corresponding to experimental value.

  Lead, The Japanese Society of Irrigation, Drainage and Rural Engineering, Feb. 2009, Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering, 77(1) (1), 43 - 51, Japanese

  [Refereed]

  Scientific journal


• ジオシンセティックスで補強した曲管部背面地盤の水平抵抗力に関する検討

  KAWABATA TOSHINORI, SAWADA YUTAKA, 柏木 歩, 毛利 栄征, UCHIDA KAZUNORI

  Thrust forces can be generated at the bend of a pipeline due to internal water pressure. Commonly, the thrust force is resisted by passive resistance acting on the bend. A concrete block can be installed at the bend when the thrust force is larger than the passive resistance. However, the heavy concrete block can become a weak point during an earthquake, because the concrete block moves largely due to inertia force. Therefore, new methods for thrust restraint are required.
  In this paper, new backfill methods for thrust restraint using geogrids are proposed. The new method comprised geogrids, installed in the passive area to improve the strength of the ground. In addition, gravel was used as backfill material in the passive area of the bend. In order to verify the effect of the proposed methods, lateral loading experiments were carried out using a model pipe with a diameter of 114 mm. The model pipe was backfilled with dry sand. After backfilling, the model pipe was laterally loaded at 0.5 mm/min. using a jack. The lateral resistance and lateral displacement acting on the model pipe were both measured. It was confirmed that the lateral resistance increased when using the proposed methods.
  In addition, numerical analyses (DEM) were performed to assess the resistance mechanism of the proposed methods. It was concluded that the lateral resistance was generated by the tensile force of the geogrid of the vertical side below the rupture surface.

  ジオシンセティックス学会日本支部, Dec. 2008, ジオシンセティックス論文集, 23, 127 - 132, Japanese

  [Refereed]

  Scientific journal


• ジオグリッドを用いた曲管部軽量スラスト防護工法の耐震性の検討

  KAWABATA TOSHINORI, SAWADA YUTAKA, 毛利 栄征, 泉明 良, 有吉 充, 平井 貴雄, 斉藤 喜久雄

  At a bend in a pressure pipeline, thrust force is generated by the bending angle and internal pressure. Generally a concrete block is installed around a bend. However, the concrete block is a weak point for an earthquake. Therefore, in our previous study, the lightweight thrust restrain using geogrids was suggested. Lateral loading tests, large scale tests and numerical analysis were conducted, and it is verified that the proposed restraint was effective against thrust force. In this study, four shaking table tests were conducted in order to verify the dynamic behavior of the proposed restraint. From the result, in case of the proposed restraint, the movement of the bend was restrained. In addition, using gravel around the geogrid, the lateral movement was extremely small.

  ジオシンセティックス学会日本支部, Nov. 2008, ジオシンセティックス論文集, 23, 133 - 138, Japanese

  [Refereed]

  Scientific journal


• Lateral Loading Tests for New Thrust Restraint Technique Using Liquefied Stabilized Soil with Geosynthetics

  KAWABATA TOSHINORI, SAWADA YUTAKA, Mohri, Y, Kashiwagi, A, Izumi, A, UCHIDA KAZUNORI

  Sep. 2008, Proceedings of the 4th European Geosynthetics Conference, English

  [Refereed]

  International conference proceedings


• Dynamic Behavior of Buried Pipe Bend with Lightweight Thrust Restraint during Liquefaction

  KAWABATA TOSHINORI, Mohri, Y, SAWADA YUTAKA, Izumi, A, Kashiwagi, A, Ariyoshi, M, UCHIDA KAZUNORI

  Sep. 2008, Proceedings of the 4th European Geosynthetics Conference, English

  [Refereed]

  International conference proceedings


• The Effect of Liquefied Stabilized Soil with Geosynthetics against Thrust Force of Buried Bend

  KAWABATA TOSHINORI, SAWADA YUTAKA, Kashiwagi, A, Izumi, A, UCHIDA KAZUNORI, Mohri, Y

  Jul. 2008, Proceedings of 18th International Offshore and Polar Engineering Conference, (2) (2), 768 - 772, English

  [Refereed]

  International conference proceedings


• Lateral Loading Tests for Buried Bend with Light-Weight Thrust Restraint in Liquefaction

  KAWABATA TOSHINORI, SAWADA YUTAKA, Izumi, A, Kashiwagi, A, UCHIDA KAZUNORI, Mohri, Y, Ariyoshi, M

  Jul. 2008, Proceedings of 18th International Offshore and Polar Engineering Conference, (2) (2), 660 - 664, English

  [Refereed]

  International conference proceedings


• Shaking table experiments on lightweight thrust restraint for buried bend

  Toshinori Kawabata, Yoshiyuki Mohri, Yutaka Sawada, Akira Izumi, Ayumu Kashiwagi, Misturu Ariyoshi, Kazunori Uchida

  ASCE, Jul. 2008, Proceedings of Pipelines Congress 2008 - Pipeline Asset Management: Maximizing Performance of Our Pipeline Infrastructure, 321, English

  [Refereed]

  International conference proceedings


• New thrust restraint technique using geosynthetics for buried bend

  Toshinori Kawabata, Yoshiyuki Mohri, Yutaka Sawada, Ayumu Kashiwagi, Akira Izumi, Takafumi Hanazawa, Kazunori Uchida

  Jul. 2008, Proceedings of Pipelines Congress 2008 - Pipeline Asset Management: Maximizing Performance of Our Pipeline Infrastructure, 321, English

  [Refereed]

  International conference proceedings


• ジオグリッドの伸び特性を考慮した圧力管曲部軽量スラスト防護工法の水平抵抗力算定手法

  SAWADA YUTAKA, 河端 俊典, 毛利 栄征, 内田 一徳

  In a bend of pressure pipeline, thrust force is generated due to internal pressure. A concrete block is used at the bend to resist the thrust force. However the concrete block will be a weak point during earthquake. In our previous study, a lightweight thrust restraint using geogrids and an anchor plate was proposed. In addition, the advantage of the proposed thrust restraint was verified from results of laboratory model tests and full-scale tests, and the resistance mechanism was examined by numerical analyses. Based on the failure mechanism, the maximum lateral resistance was evaluated by solving equations for force equilibrium. In the present study, the lateral resistance of the proposed method was formulated considering the elongation of geogrids. In addition, results calculated by the proposed formula were compared with experimental results. As the results, it was concluded that the lateral resistance can be evaluated by proposed formula.

  Lead, ジオシンセティックス学会日本支部, Nov. 2007, ジオシンセティックス論文集, 22, 253 - 258, Japanese

  [Refereed]

  Scientific journal


• Large Scale Tests of Buried Bend with Lightweight Thrust Restraint Method

  KAWABATA TOSHINORI, SAWADA YUTAKA, Ogushi, K, Totsugi, A, Hironaka, J, UCHIDA KAZUNORI

  Jul. 2007, Proceedings of 17th International Offshore and Polar Engineering Conference, 908 - 9013, English

  [Refereed]

  International conference proceedings


• Estimation of Incremental Resistance of Lightweight Thrust Restraint for Buried Bend Using Geosynthetics

  SAWADA YUTAKA, Kawabata, T, Mohri, Y, Uchida, K

  Lead, Jul. 2007, Proceedings of 17th International Offshore and Polar Engineering Conference, 914 - 920, English

  [Refereed]

  International conference proceedings


• Formulation for Lateral Resistance of Lightweight Thrust Restraint Considering Elongation of Geogrid

  SAWADA YUTAKA, Kawabata, T, Mohri, Y, Uchida, K

  Lead, Research Center for Urban Safety and Security, Kobe University, Mar. 2007, Report of Research Center for Urban Safety and Security, 11, 367 - 376, English

  Research institution


• Estimation method for incremental resistance on lightweight thrust restraint using geogrid

  SAWADA YUTAKA, KAWABATA TOSHINORI, 毛利 栄征, UCHIDA KAZUNORI

  Lead, ジオシンセティックス学会日本支部, Dec. 2006, ジオシンセティックス論文集, 21, 97 - 104, Japanese

  [Refereed]

  Scientific journal


• Large-scale experiments on pipe bend with lightweight thrust restraint using geogrid

  KAWABATA TOSHINORI, SAWADA YUTAKA, 大串 賢, 戸継 昭人, 弘中 淳市, 毛利 栄征, UCHIDA KAZUNORI

  ジオシンセティックス学会日本支部, Dec. 2006, ジオシンセティックス論文集, 21, 105 - 110, Japanese

  [Refereed]

  Scientific journal


• Verification of Effectiveness for Lightweight Thrust Restraint Method of Buried Bend and Mechanism of Lateral Resistance by Model Tests

  KAWABATA Toshinori, SAWADA Yutaka, MOHRI Yoshiyuki, UCHIDA Kazunori

  農業土木学会, Aug. 2006, Transactions of the Japanese Society of Irrigation, Drainage and Reclamation Engineering, 74(4) (4), 581 - 587, Japanese


• 模型実験による軽量曲管スラスト防護工法の機能検証とその発現機構

  KAWABATA TOSHINORI, SAWADA YUTAKA, 毛利 栄征, UCHIDA KAZUNORI

  農業土木学会, Aug. 2006, 農業土木学会論文集, (244) (244), 179 - 185, Japanese

  [Refereed]

  Scientific journal


• The behavior of buried flexible pipe in peat ground

  Toshinori Kawabata, Hoe I. Ling, Masato Osawa, Yutaka Sawada, Tetsuya Matsukawa

  ASCE, 2006, Proceedings of the 2006 Pipeline Division Specialty Conference - Pipelines 2006: Service to the Owner, 211 40854, 81, English

  [Refereed]

  International conference proceedings


• Resistant mechanism on thrust protecting method for buried bend with geogrid

  SAWADA YUTAKA, KAWABATA TOSHINORI, 北野 知洋, UCHIDA KAZUNORI, 平井 貴雄, 斉藤 喜久雄

  Lead, ジオシンセティックス学会日本支部, Dec. 2005, ジオシンセティックス論文集, 20, 217 - 222, Japanese

  [Refereed]

  Scientific journal


• Lateral Loading Experiments on Thrust Protecting Method for Buried Bend with Geogrid

  KAWABATA TOSHINORI, SAWADA YUTAKA, UCHIDA KAZUNORI, Hirai, T, Saito, K

  ASCE, Jul. 2005, Proceedings of Geo-Frontiers 2005, (130-142) (130-142), 2763 - 2770, English

  [Refereed]

  International conference proceedings


• Experiments for Aseismic Thrust Protection Using Geogrid

  KAWABATA TOSHINORI, SAWADA YUTAKA, Kitano, T, UCHIDA KAZUNORI

  Jul. 2005, Proceedings of International Conference on Energy, Environment and Disasters, English

  [Refereed]

  International conference proceedings


• Model tests on thrust protecting method for buried bend with geogrid

  KAWABATA TOSHINORI, SAWADA YUTAKA, UCHIDA KAZUNORI, 平井 貴雄, 斉藤 喜久雄

  ジオシンセティックス学会日本支部, Dec. 2004, ジオシンセティックス論文集, 19, 59 - 64, Japanese

  [Refereed]

  Scientific journal


• Thrust protecting method for buried pipeline bend using the geogrid, No.2

  Kawabata Toshinori, Tanaka Yasuo, Uchida Kazunori, Hirai Takao, Saito Kikuo, Sawada Yutaka, Nagata Masaya

  Kobe University, Mar. 2004, Report of Research Center for Urban Safety and Security, Kobe University, 8(8) (8), 327 - 333, Japanese

  Link to Kobe Univ. Repository (Kernel)


• Lateral loading tests for buried pipe with geosynthetics

  Toshinori Kawabata, Kazunori Uchida, Hoe I. Ling, Hitoshi Nakase, Yutaka Sawada, Takao Hirai, Kikuo Saito

  2004, Geotechnical Special Publication, 126(126 I) (126 I), 609 - 616, English, International magazine

  [Refereed]

  International conference proceedings


• Distribution of traffic loads for shallowly buried pipe by D.E.M. analyses

  T. Kawabata, M. Ariyoshi, K. Uchida, H. I. Ling, H. Nakase, Y. Sawada, Y. Mohri

  ASCE, Aug. 2004, Proceedings of the ASCE Pipeline Division Specialty Congress - Pipeline Engineering and Construction, 255 - 264, English

  [Refereed]

  International conference proceedings


• ジオシンセティックスを用いた曲管部スラスト防護工法に関する基礎研究

  KAWABATA TOSHINORI, UCHIDA KAZUNORI, 田中 泰雄, 平井 貴雄, 斉藤 喜久雄, SAWADA YUTAKA, 中瀬 仁, 平山 豪隆, 今井 正幸

  本論では,ジオシンセティクスを活用したスラスト防護工法の有効性を明らかにするため,∅90の模型パイプを対象に,乾燥砂地盤内で横引き実験を行い,その抵抗力について検討した.その結果,パイプの後方にジオグリッドを鉛直方向に設置する工法が,スラスト防護工法として極めて有効であるこが明らかになった.さらに,そのメカニズムについてDEM解析から検討を加えた.

  ジオシンセティックス学会日本支部, Dec. 2003, ジオシンセティックス論文集, 18, 215 - 220, Japanese

  [Refereed]

  Scientific journal


• Thrust protecting method for buried pipeline bend using the geogrid, Report No.1

  Kawabata Toshinori, Tanaka Yasuo, Uchida Kazunori, Hirai Takao, Nakase Hitoshi, Saito Kikuo, Sawada Yutaka, Imai Masayuki

  Kobe University, Mar. 2003, Report of Research Center for Urban Safety and Security, Kobe University, 7(7) (7), 299 - 305, Japanese

  Link to Kobe Univ. Repository (Kernel)

• セメント改良されたため池の経時変化に関する現地調査

  大山俊一, 泉明良, 徳村秀一, 澤田豊

  Last, Apr. 2025, 93(4) (4), 29 - 34, Japanese, Domestic magazine, Co-authored internationally

  [Refereed]

  Introduction scientific journal


• Design and Construction Standardization of Earth Dam Embankments with Geosynthetic Clay Liners in Hyogo Prefecture

  小田哲也, 澤田豊, 野村純数, 福永隼也, 前田真宏, 泉明良, 堀俊和

  Feb. 2024, 水土の知, 92(2) (2), 15 - 18, Japanese

  [Refereed]


• 全国初の「ため池ベントナイトシート工法設計・施工マニュアル」の策定

  泉明良, 澤田豊, 小田哲也, 徳村秀一, 大山俊一

  Jan. 2024, 大ダム, (266) (266), 5 - 8, Japanese


• Investigation of Orientation Angle of Short Glass Fiber in Polyethylene Pipe Using X-ray CT

  時吉 充亮, 竹内 翔吾, 木津 遼太郎, 澤田 豊, 河端 俊典

  The Japanese Society of Irrigation, Drainage and Rural Engineering, 2023, Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering, 91(1) (1), IV_1 - IV_4, Japanese, Domestic magazine

  [Refereed]

  Report scientific journal


• レキの掃流摩耗を模擬した「回転式水中摩耗試験」－河川構造物の耐摩耗性の評価に活用－

  金森拓也, 有田淳一, 浅野勇, 川邉翔平, 青柳邦夫, 澤田豊, 河端俊典, 森充広

  Oct. 2022, ARIC情報, (147) (147), 8 - 13


• GCLを用いたため池堤体に関するこれまでの研究と設計・施工マニュアル確立に向けた取り組み

  小田哲也, 澤田豊, 野村純数, 福永隼也, 泉明良, 堀俊和, 河端俊典

  Mar. 2022, ジオシンセティックス技術情報誌, 38(1) (1), 27 - 32, Japanese, Domestic magazine

  Introduction scientific journal


• Dynamic behavior of small earth dams subjected to the combined effects of rainfall and earthquakes

  Akira Izumi, Yutaka Sawada, Riku Maki, Toshikazu Hori

  Mar. 2022, 地盤工学会誌, 70(3) (3), 22 - 25, Japanese, Domestic magazine

  [Refereed]

  Introduction scientific journal


• 降雨と地震の作用下におけるため池堤体の変形・破壊に関する実験研究 －ため池の安全性向上に向けて－

  中澤 博志, 石澤 友浩, 檀上 徹, 澤田 豊, 尾上 修浩, 西 剛整

  近年，地球温暖化に起因する気候変動や極端気象による各種災害が頻発している．また，地震による大規模被害も多く生じており，考慮すべき地震動を含め，降雨を考慮したため池堤体の耐震性を検討する必要があるものと考えられる．本研究では降雨あるいは地震を再現し，先行する事象・外力による損傷レベルによる最終的な被害様相の違いを確認するため，典型的なため池堤体模型を用いた降雨・振動実験を実施した．実験では，土槽内に同一断面のため池堤体を2 ケース作製し，「先行降雨+地震」，および「先行地震+ 降雨」のケースで振動実験を実施した．一連の実験から，1）降雨前の振動台実験において，盛土上流側の加速度応答が大幅に増幅された．2）降雨と震動台実験の順序の違いにより，ため池堤体の残留変形が異なることを確認した．これは，降雨浸透過程の違いによるものであり，堤体内の飽和度の変化がため池堤体の耐震性と残留変形に及ぼす影響が明らかであることが示唆された．In Tokyo, inland floods occupy about 80 percent of the economic damages caused by floods. Thus, a countermeasure to inland floods is an important issue. In this study, the factors contributing to inland floods in Tokyo are analyzed with the discrimination analysis using the rainfall data derived from X-band multi-parameter radar and the grid data of national land information. The results showed that the most important factor contributing to the occurrence of inland floods in Tokyo is the maximum hourly rainfall. When hourly rainfall exceeds 50 mm, inland floods tend to occur. The area ratio of depressed ground and buildings also contribute to the occurrence of inland floods. On the other hand, gradient of the topography has negative contribution.

  防災科学技術研究所, 26 Jan. 2021, 防災科学技術研究所研究資料 = Technical Note of the National Research Institute for Earth Science and Disaster Resilience, 457, 1 - 29, Japanese


• ベントナイト系遮水シートにより改修されるため池の耐震性

  SAWADA YUTAKA, 中澤 博志, KAWABATA TOSHINORI

  新樹社, Apr. 2019, 防水ジャーナル, (2019年4月号) (2019年4月号), 68 - 71, Japanese

  [Invited]

  Introduction commerce magazine


• ベントナイト系遮水シートの設置方法がため池堤体の耐震性に与える影響

  中澤 博志, 澤田 豊, 重元 凜太郎, 古林 智宏, 谷本 幹夫, 澁谷 啓, 河端 俊典, 森田 明平, 小田 哲也, 梶原 浩一, 井上 貴仁

  近年のため池改修では，ベントナイト系遮水シート（GCL）を用いて改修する事例が増えている．既 往の研究で GCL および従来の前刃金工法を用いた堤体を対象とした実大規模震動実験で，両者の耐震 性が検証された．実際の施工では，GCL を継ぎ足す場合に重ね合わせ部が設けられる．また，階段状 のみならず直線状に設置される例も見られる．しかしながら，GCL 重ね合わせ部や設置方法の違いが 堤体の安定性におよぼす影響は明らかでない．そこで本研究では，重ね合わせ部および直線状に設置 された GCL を有する堤高 3 m の堤体を対象に震動実験を行い，既往研究の連続かつ階段状に設置され た GCL を有する堤体との比較検討を行った．実験結果から，レベル2 地震動により，重ね合わせ部の 相対変位は発生しないことが明らかになった．さらに，クラック発生状況および堤体の変形状況から， 直線状よりも階段状に設置した堤体の方が耐震性が高いことが明らかになった．Recent years, Geosynthetic Clay Liners (GCLs) have been used to repair deteriorated small earth dams as impermeable materials. In a past study, the seismic performance of the embankment, in which a continuous GCL was installed in a stairs shape was verified. When retrofitting a embankment with GCL, GCL panel overlap can be introduced. In addition to a stairs shape, GCLs are used in a straight shape. However, the effects of GCL panel overlap and difference of installation methods on the seismic performance of the embankments remain unclear. In this study, full-scale shaking table tests were performed for 3 m embankment models with GCLs installed in a stairs shape and a straight shape, which were compared with the embankment with a continuous GCL in the past study. As a result, it was indicated that no change in GCL overlap length occurred due to shear displacement associated with Level2 shaking. Moreover, comparing the damage survey of embankments, it was revealed that the seismic performance of the straight shape is lower than that of the stairs shape.

  防災科学技術研究所, 29 Jan. 2019, 防災科学技術研究所研究資料 = Technical Note of the National Research Institute for Earth Science and Disaster Resilience, 425, 1 - 102, Japanese


• ため池堤体の耐震安全性に関する実験研究 －改修されたため池堤体の耐震性能検証－

  中澤 博志, 澤田 豊, 古林 智宏, 小田 哲也, 小林 成太, 河端 俊典, 澁谷 啓, 片岡 沙都紀, 山下 拓三, 梶原 浩一, 井上 貴仁

  防災科学技術研究所, Feb. 2017, 防災科学技術研究所 研究資料, 410(410) (410), 1 - 87, Japanese


• 農業農村整備におけるジオシンセティックスの活用

  SAWADA YUTAKA, KAWABATA TOSHINORI

  国際ジオシンセティックス学会日本支部, Jul. 2016, ジオシンセティックス技術情報, 32(2) (2), 24 - 29, Japanese

  [Invited]

  Introduction scientific journal


• 兵庫県におけるため池の耐震調査と保全・管理について

  小田 哲也, 森脇 馨, 谷垣 和彦, 野村 純数, SAWADA YUTAKA, KAWABATA TOSHINORI

  公益社団法人農業農村工学会, Dec. 2015, 水土の知, 83(12) (12), 7 - 10, Japanese

  [Refereed]

  Introduction scientific journal


• 平成26年度農業農村工学会学術基金報告 地震による液状化が津波による構造物背後地盤の洗掘に及ぼす影響

  SAWADA YUTAKA

  公益社団法人 農業農村工学会, Apr. 2015, 水土の知, 83(4) (4), 66 - 67, Japanese

  Others


• ため池の耐震化事例

  SAWADA YUTAKA

  神戸の減災研究会, Aug. 2013, 神戸の減災研究会研究成果報告書, 134 - 136, Japanese

  Introduction other


• 世界に先駆けた防災・減災技術の構築に向けて

  三宅 達夫, SAWADA YUTAKA

  中部土質試験協同組合, Sep. 2011, Geo-Labo Chubu ニュースレター, (121) (121), 2 - 4, Japanese

  Introduction other


• ジオグリッドによる圧力管屈曲部の耐震化工法の研究開発

  KAWABATA TOSHINORI, SAWADA YUTAKA, 毛利 栄征

  ジオシンセティックス学会日本支部, Jul. 2011, ジオシンセティックス技術情報, 27(2) (2), 28 - 35, Japanese

  [Refereed]

  Introduction scientific journal


• 遠心力場における津波実験手法の開発

  三宅 達夫, 鶴ヶ崎 和博, SAWADA YUTAKA

  Mar. 2011, 電力土木, (352) (352), 125 - 127, Japanese

  Introduction commerce magazine


• 遠心力場における地震・津波実験手法の開発

  三宅 達夫, SAWADA YUTAKA

  一般社団法人 日本埋立浚渫協会, Jul. 2010, marine voice 21 Summer 2010, (270) (270), 20 - 23, Japanese

  Introduction other

• Theory and application of hydraulic modeling : interaction between fluid and ground under water waves

  Arikawa, Taro, 土木学会, 土木学会海岸工学委員会

  Joint work, Chapter 2, CRC Press, 2024, English, ISBN: 9781032544137

  Scholarly book


• 水理模型実験の理論と応用 : 波動と地盤の相互作用

  土木学会, 土木学会海岸工学委員会水理模型実験における地盤材料の取扱方法に関する研究小委員会

  Contributor, 2.3.2, 土木学会,丸善出版 (発売), Sep. 2021, 22-24, Japanese, ISBN: 9784810610376

  Scholarly book


• 奈良盆地

  KG-NET・関西圏地盤研究会, 関西地質調査業協会

  Contributor, 第Ⅰ編 5.地域の土質 (5)奈良県のため池, KG-NET・関西圏地盤研究会, Sep. 2018, pp.80-83, Japanese, ISBN: 9784990605322

  Scholarly book


• New Horizons in Earth Reinforcement, Full-Scale Experiments on Bend of Pressure Pipeline Using Geogrid

  SAWADA YUTAKA, KAWABATA TOSHINORI, Totsugi, A, Hironaka, J, UCHIDA KAZUNORI

  Joint work, Taylor & Francis, Nov. 2007, English

  Scholarly book


• Geosynthetics, Model tests for new lightweight thrust restrain using geogrid

  KAWABATA TOSHINORI, SAWADA YUTAKA, UCHIDA KAZUNORI, Kitano, T, Ling, H.I, Hirai, T, Saito, K

  Joint work, Millpress Science, Sep. 2006, English

  Scholarly book

• Model tests on pipe deformation and soil pressure during sheet pile extraction

  Sonoda Yusuke, Nagatomo Hina, Sawada Yutaka

  the 10th Asian Young Geotechnical Engineers Conference, Nov. 2024, English

  Oral presentation


• ジオセルで補強された埋設管の浮き上がり抵抗力について (その 1）

  池端瑠香, 永谷太志, 沢井拓, 伊藤修二, 園田悠介, 澤田豊

  第73回農業農村工学会大会講演会, Japanese

  Oral presentation


• ジオセルで補強された埋設管の浮き上がり抵抗力について (その2）

  永谷太志, 池端瑠香, 名黒康太, 伊藤修二, 園田悠介, 澤田豊

  第73回農業農村工学会大会講演会, Japanese

  Oral presentation


• ジオセルで補強された埋設管の浮き上がり抵抗力について (その3）

  永谷太志, 池端瑠香, 伊藤修二, 園田悠介, 澤田豊

  第73回農業農村工学会大会講演会, Japanese

  Oral presentation


• 埋設条件下における樹脂管の長期的変形性能について

  藤本光伸, 硲昌也, 日野林譲二, 澤田豊, 毛利栄征

  第73回農業農村工学会大会講演会, Japanese

  Oral presentation


• 天端の固化改良がため池堤体の地震時安定性に与える影響（その1）

  小西優輝, 大山峻一, 泉明良, 園田悠介, 澤田豊

  第73回農業農村工学会大会講演会, Japanese

  Oral presentation


• 天端の固化改良がため池堤体の地震時安定性に与える影響（その2）

  大山峻一, 泉明良, 澤田豊

  第73回農業農村工学会大会講演会, Japanese

  Oral presentation


• ため池堤体の変形挙動に関する動的遠心載荷模型実験

  泉明良, 大山峻一, 澤田豊

  第73回農業農村工学会大会講演会, Japanese

  Oral presentation


• リブ付きポリエチレン管の内圧負荷時の応力に関する一考察

  園田 悠介, 森野 直毅, 髙原 源太朗, 宮永 久詩, 澤田 豊

  第73回農業農村工学会大会講演会, Sep. 2024, Japanese

  Oral presentation


• ため池に流入する土石流が堤体に及ぼす衝撃圧の評価に関する水路模型実験

  園田 悠介, 松本 赳, 蓮尾 佑帆, 澤田 豊

  第73回農業農村工学会大会講演会, Sep. 2024, Japanese

  Oral presentation


• ジオセルが矢板引抜き時の管の力学挙動に与える影響，第73回農業農村工学会大会講演会

  園田 悠介, 重吉 振一郎, 長友 陽奈, 澤田 豊

  第73回農業農村工学会大会講演会, Sep. 2024, Japanese

  Oral presentation


• 浮上防止としてジオセル補強された埋設管の水平載荷実験

  永谷 太志, 池端 瑠香, 蘆田 彩絵, 伊藤 修二, 園田 悠介, 澤田 豊

  第73回農業農村工学会大会講演会, Sep. 2024, Japanese

  Oral presentation


• 矢板施工におけるたわみ性管の挙動に関する模型実験―矢板厚が小さい条件での影響について―

  長友 陽奈, 園田 悠介, 澤田 豊, 河端 俊典

  第73回農業農村工学会大会講演会, Sep. 2024, Japanese

  Oral presentation


• スラスト力を受ける二条埋設管路の挙動に関する個別要素法解析

  井上 優佑, 太田 遥子, 園田 悠介, 澤田 豊, 河端 俊典

  第73回農業農村工学会大会講演会, Sep. 2024, Japanese

  Oral presentation


• ジオセルを用いた埋設管浮上対策に関する振動台実験

  池端 瑠香, 永谷 太志, 伊藤 修二, 園田 悠介, 澤田 豊

  第73回農業農村工学会大会講演会, Sep. 2024, Japanese

  Oral presentation


• Flume model test on granular materials flowing into a small fill dam

  Sonoda Y, Tsujimoto, K, Matsumoto, T, Sawada, Y

  6th World Landslide Forum 2023, Nov. 2023


• スラスト力を受ける二条埋設管路の模型実験

  井上 優佑, 太田 遥子, 澤田 豊, 園田 悠介, 河端 俊典

  第80回農業農村工学会京都支部研究発表会, Nov. 2023, Japanese

  Oral presentation


• 既設開水路内に設置された埋設管屈曲部における遠心模型振動実験

  永谷太志, 澤田豊, 有吉充, 河端俊典

  第58回地盤工学研究発表会, Jul. 2023, Japanese

  Oral presentation


• 貯留水に流入する粒状体の流動性に関する一考察

  園田 悠介, 松本 赳, 澤田 豊

  第79回農業農村工学会京都支部研究発表会, Nov. 2022, Japanese, Domestic conference

  Oral presentation


• 基礎地盤の透水性がため池堤体内の浸潤線に及ぼす影響

  松本 赳, 澤田 豊, 清水 正義, 河端 俊典

  第71回農業農村工学会大会講演会, Aug. 2022, Japanese, Domestic conference

  Oral presentation


• 管底側部に設置したEPS基礎がたわみ性埋設管の力学挙動に与える影響に関する埋設模型実験

  園田 悠介, 伊川 千颯, 辻本 琴音, 永谷 太志, 工藤 秀穂, 澤田 豊, 河端 俊典

  第71回農業農村工学会大会講演会, Aug. 2022, Japanese, Domestic conference

  Oral presentation


• 矢板施工における矢板厚と根入れ長がたわみ性埋設管の土圧に与える影響

  徳増 美月, 池端 瑠香, 園田 悠介, 澤田 豊, 河端 俊典

  第71回農業農村工学会大会講演会, Aug. 2022, Japanese, Domestic conference

  Oral presentation


• 既設開水路内に設置された埋設管屈曲部における水平載荷実験

  永谷 太志, 太田 遥子, 澤田 豊, 河端 俊典

  第71回農業農村工学会大会講演会, Aug. 2022, Japanese, Domestic conference

  Oral presentation


• 貯留状態のため池に流入する土石流に関する基礎的実験

  園田 悠介, 松本 赳, 井上 優佑, 澤田 豊, 河端 俊典

  第71回農業農村工学会大会講演会, Aug. 2022, Japanese, Domestic conference

  Oral presentation


• プレキャストコンクリート板を用いた埋設管路屈曲部のスラスト対策工法に関する水平載荷実験

  永谷 太志, 太田 遥子, 澤田 豊, 河端 俊典

  第57回地盤工学研究発表会, Jul. 2022, Japanese


• ジオグリッドを用いた 管路屈曲部スラスト対策工法の水平抵抗力予測手法

  太田 遥子, 喜多田 恵, 澤田 豊, 河端 俊典

  第78回農業農村工学会京都 支部研究発表会, Nov. 2021, Japanese, Domestic conference

  Oral presentation


• ベントナイト系遮水シートを用いたため池堤体の浸潤線について

  松本 赳, 澤田 豊, 井上 和徳, 浦部 朋子, 河端 俊典

  第70回農業農村工学会大会講演会, Aug. 2021, Japanese, Domestic conference


• たわみ性埋設管の管底側部の締固め不足に対する対策工に関する実験的検討

  河村 未奈, 青木 達也, 伊川 千颯, 園田 悠介, 日野林 譲二, 澤田 豊, 河端 俊典

  第70回農業農村工学会大会講演会, Aug. 2021, Japanese, Domestic conference

  Oral presentation


• フィルターユニットのため池補強効果に関する遠心模型実験

  阿部 春輝, 廣川 慎, 澤田 豊, 泉 明良, 堀 俊和, 河端 俊典

  第70回農業農村工学会大会講演会, Aug. 2021, Japanese, Domestic conference

  Oral presentation


• 既設開水路内に敷設された圧力管路屈曲部における水平載荷実験

  永谷 太志, 太田 遥子, 澤田 豊, 河端 俊典

  第70回農業農村工学会大会講演会, Aug. 2021, Japanese, Domestic conference

  Oral presentation


• 載荷幅がジオセル補強地盤の水平抵抗力に与える影響

  喜多田 恵, 山下 日菜, 澤田 豊, 河端 俊典

  第70回農業農村工学会大会講演会, Aug. 2021, Japanese, Domestic conference

  Oral presentation


• 矢板引抜き時の埋設たわみ性管に作用する土圧について

  徳増 美月, 園田 悠介, 戸田 茉優, 澤田 豊, 河端 俊典

  第70回農業農村工学会大会講演会, Aug. 2021, Japanese, Domestic conference

  Oral presentation


• ジオセルで補強されたアンカープレートの水平載荷実験①内部充填材の影響

  喜多田 恵, 山下 日菜, 澤田 豊, 河端 俊典

  第56回地盤工学研究発表会, Jul. 2021, Japanese, Domestic conference

  Oral presentation


• ジオセルで補強されたアンカープレートの水平載荷実験②ジオセルの配置方向の影響

  喜多田 恵, 山下 日菜, 澤田 豊, 河端 俊典

  第56回地盤工学研究発表会, Jul. 2021, Japanese, Domestic conference

  Oral presentation


• 砕石による圧力管路屈曲部のスラスト対策に関する遠心振動実験

  太田 遥子, 喜多田 恵, 澤田 豊, 有吉 充, 泉 明良, 井上 一哉, 毛利 栄征, 河端 俊典

  2020年度農業農村工学会大会講演会, Aug. 2020, Domestic conference

  Oral presentation


• 地中連続壁により改修されたため池堤体の越流浸食に関する数値解析

  廣川 慎, 澤田 豊, 川崎 哲人, 小西 一生, 河端 俊典

  2020年度農業農村工学会大会講演会, Aug. 2020, Domestic conference

  Oral presentation


• 矢板引抜きに伴う浅埋設パイプラインの力学挙動に関する実験的検討

  戸田 茉優, 宮崎 礼丈, 澤田 豊, 河端 俊典

  2020年度農業農村工学会大会講演会, Aug. 2020, Domestic conference

  Oral presentation


• 地盤密度および矢板の物理特性がたわみ性埋設管に及ぼす影響について

  徳増 美月, 石川 拓也, 澤田 豊, 河端 俊典

  2020年度農業農村工学会大会講演会, Aug. 2020, Domestic conference

  Oral presentation


• 降雨と地震の複合作用を受けるため池堤体に関する遠心模型実験

  阿部 春輝, 眞木 陸, 泉 明良, 澤田 豊, 堀 俊和, 河端 俊典

  2020年度農業農村工学会大会講演会, Aug. 2020, Domestic conference

  Oral presentation


• 圧力管路屈曲部スラスト防護工法の水平抵抗力の推定

  喜多田 恵, 太田 遥子, 澤田 豊, 河端 俊典

  2020年度農業農村工学会大会講演会, Aug. 2020, Domestic conference

  Oral presentation


• ため池堤体法面内への降雨浸透に関する実験的検討

  眞木 陸, 阿部 春輝, 松本 赳, 澤田 豊, 河端 俊典

  2020年度農業農村工学会大会講演会, Aug. 2020, Domestic conference

  Oral presentation


• 地中連続壁により改修されたため池堤体天端の越流時浸食特性に関する実験的検討

  角川 莉央, 永谷 太志, 澤田 豊, 川﨑 哲人, 小西 一生, 河端 俊典

  2020年度農業農村工学会大会講演会, Aug. 2020, Domestic conference

  Oral presentation


• 矢板引抜きに伴う浅埋設たわみ性管の力学挙動に関するDEM解析

  宮崎 礼丈, 戸田 茉優, 青木 達也, 澤田 豊, 河端 俊典

  2020年度農業農村工学会大会講演会, Aug. 2020, Domestic conference

  Oral presentation


• 固結工法による圧力管路屈曲部のスラスト力対策に関する遠心振動実験

  有吉 充, 太田 遥子, 澤田 豊, 喜多田 恵, 毛利 栄征, 泉 明良, 河端 俊典

  2020年度農業農村工学会大会講演会, Aug. 2020, Domestic conference

  Oral presentation


• ベントナイト系遮水シートを敷設したため池堤体の浸潤線の位置に関する解析的検討

  阿部 春輝, 眞木 陸, 澤田 豊, 河端 俊典

  第76回農業農村工学会京都支部研究発表会, Nov. 2019, Domestic conference

  Oral presentation


• ベントナイト系遮水シートを敷設したため池堤体の現地水位計測

  眞木 陸, 澤田 豊, 河端 俊典, 神信 浩一, 谷本 幹夫, 中澤 博志

  第76回農業農村工学会京都支部研究発表会, Nov. 2019, Domestic conference

  Oral presentation


• 3次元FEMによる軟弱地盤内のPE管及び継手の挙動に関する検討

  上田 前向, 徳増 美月, 高原 源太朗, 日野林 譲二, 澤田 豊, 河端 俊典

  平成31年度農業農村工学会大会講演会, Sep. 2019, Domestic conference

  Oral presentation


• EPS 破砕片を用いた地盤侵食の促進に関する水理実験

  竹川 尚希, 角川 莉央, 澤田 豊, 河端 俊典

  平成31年度農業農村工学会大会講演会, Sep. 2019, Domestic conference

  Oral presentation


• 矢板施工時における二条埋設管の敷設間隔が変形挙動に及ぼす影響

  戸田 茉優, 宮崎 礼丈, 石川 拓也, SAWADA YUTAKA, KAWABATA TOSHINORI

  第54回地盤工学研究発表会, Jul. 2019, Japanese, さいたま市, Domestic conference

  Oral presentation


• 埋設管の屈曲角度が水平抵抗力に与える影響に関する3次元個別要素法解析

  廣川 慎, 寺田 健司, SAWADA YUTAKA, KAWABATA TOSHINORI

  第54回地盤工学研究発表会, Jul. 2019, Japanese, さいたま市, Domestic conference

  Oral presentation


• 屈曲角度および表面摩擦が異なる曲管の水平載荷実験

  河村 未奈, 太田 遥子, SAWADA YUTAKA, KAWABATA TOSHINORI

  第54回地盤工学研究発表会, Jul. 2019, Japanese, さいたま市, Domestic conference

  Oral presentation


• ジオグリッドと砕石を用いた圧力管路屈曲部スラスト対策工法に関する1G場小型振動実験②（液状化地盤での有効性の検討）

  太田 遥子, 河村 未奈, 喜多田 恵, SAWADA YUTAKA, KAWABATA TOSHINORI

  第54回地盤工学研究発表会, Jul. 2019, Japanese, さいたま市, Domestic conference

  Oral presentation


• ジオグリッドと砕石を用いた圧力管路屈曲部スラスト対策工法に関する1G場小型振動実験①（耐震性の検討）

  喜多田 恵, 太田 遥子, 河村 未奈, SAWADA YUTAKA, KAWABATA TOSHINORI

  第54回地盤工学研究発表会, Jul. 2019, Japanese, さいたま市, Domestic conference

  Oral presentation


• 矢板引抜きが二条埋設たわみ性管に及ぼす影響関するDEM解析

  宮崎 礼丈, 石川 拓也, 戸田 茉優, 澤田 豊, KAWABATA TOSHINORI

  農業農村工学会京都支部第75回研究発表会, Nov. 2018, Japanese, Domestic conference

  Oral presentation


• 不同沈下させたポリエチレン管路の繰り返し内水圧負荷時の力学的挙動

  上田 前向, 澤田 豊, KAWABATA TOSHINORI, 日野林 讓二, 髙原 源太朗

  農業農村工学会京都支部第75回研究発表会, Nov. 2018, Japanese, Domestic conference

  Oral presentation


• 軽量スラスト防護工法の形状寸法効果に関する一考察

  太田 遥子, 河村 未奈, 澤田 豊, KAWABATA TOSHINORI

  農業農村工学会京都支部第75回研究発表会, Nov. 2018, Japanese, Domestic conference

  Oral presentation


• 圧力管路屈曲部の角度が水平スラスト抵抗力に与える影響

  河村 未奈, 太田 遥子, 澤田 豊, KAWABATA TOSHINORI

  農業農村工学会京都支部第75回研究発表会, Nov. 2018, Japanese, Domestic conference

  Oral presentation


• 基床部の緩みが埋設管継手部近傍の管体挙動に与える影響

  石川 拓也, 小野 耕平, 澤田 豊, 春本 朋洋, 森上 浩伸, KAWABATA TOSHINORI

  平成30年度農業農村工学会大会講演会, Sep. 2018, Japanese, Domestic conference

  Oral presentation


• 海岸堤防を越流する津波想定した鉛直噴に対する洗堀策の実験的検討

  竹川 尚希, 戸田 茉優, 澤田 豊, KAWABATA TOSHINORI

  平成30年度農業農村工学会大会講演会, Sep. 2018, Japanese, Domestic conference

  Oral presentation


• ジオグリッドを用いた埋設管屈曲部のスラスト防護工法に関する個別要素法シミュレーション

  寺田 健司, 廣川 慎, 澤田 豊, KAWABATA TOSHINORI

  平成30年度農業農村工学会大会講演会, Sep. 2018, Japanese, Domestic conference

  Oral presentation


• コンクリート製柔構造底樋の動的挙動に関する実験的検討

  宮崎 礼丈, 有吉 充, 有田 淳一, 澤田 豊, KAWABATA TOSHINORI

  平成30年度農業農村工学会大会講演会, Sep. 2018, Japanese, Domestic conference

  Oral presentation


• ガラス繊維強化ポリエチレン管システムの地盤変状による管軸方向変位が生じた場合の繰り返し内水圧による挙動

  髙原 源太朗, 上田 前向, 澤田 豊, 日野林 譲二, 加後 郁也, 中村 和正, KAWABATA TOSHINORI

  平成30年度農業農村工学会大会講演会, Sep. 2018, Japanese, Domestic conference

  Oral presentation


• 遠心模型実験による消波ブロック被覆堤マウンド下部地盤の吸出し現象の再現

  荒木 進歩, SAWADA YUTAKA, 宮本 順司, 田中 佑弥, 牛山 弘己

  平成30年度土木学会全国大会第73回年次学術講演会, Aug. 2018, Japanese, 札幌, Domestic conference

  Oral presentation


• ドラム型遠心模型実験による消波ブロック被覆堤マウンド下部地盤の間隙水圧挙動

  田中 佑弥, 宮本 順司, 牛山 弘己, 荒木 進歩, 小竹 康夫, SAWADA YUTAKA

  平成30年度土木学会全国大会第73回年次学術講演会, Aug. 2018, Japanese, 札幌, Domestic conference

  Oral presentation


• 遮水シートを用いたため池堤体の耐震性に関する実大実験（その2）-実験後の堤体損傷状況-

  重元 凜太郎, 澤田 豊, 豊吉 巧也, 中澤 博志, 古林 智宏, 澁谷 啓, KAWABATA TOSHINORI

  第53回地盤工学研究発表会, Jul. 2018, Japanese, 高松市, Domestic conference

  Oral presentation


• 遮水シートを用いたため池堤体の耐震性に関する実大実験(その1)-プロジェクト概要-

  中澤 博志, 澤田 豊, 重元 凜太郎, 古林 智宏, 豊吉 巧也, 谷本 幹夫, 小田 哲也, 澁谷 啓, KAWABATA TOSHINORI

  第53回地盤工学研究発表会, Jul. 2018, Japanese, Domestic conference

  Oral presentation


• 遮水シートの敷設方法がため池堤体の動的挙動に及ぼす影響

  Maki, R, Shigemoto, R, Sawada, Y, Kotake, N, Suzuki, M, Kawabata, T

  第53回地盤工学研究発表会, Jul. 2018, Japanese, 高松市, Domestic conference

  Oral presentation


• 開水路継目部における背面土砂の吸い出しに関する水理模型実験

  竹川尚希, 澤田豊, KAWABATA TOSHINORI

  農業農村工学会京都支部第74回研究発表会講演会, Oct. 2017, Japanese, 金沢市, Domestic conference

  Oral presentation


• 個別要素法による矢板引抜き時における埋設管と周辺地盤の相互作用に関する検討

  寺田 健司, 高原 祥, SAWADA YUTAKA, KAWABATA TOSHINORI

  第52回地盤工学研究発表会, Sep. 2017, Japanese, 名古屋市, Domestic conference

  Oral presentation


• 異なる矢板設置条件におけるたわみ性埋設管の力学挙動に関する模型実験

  寺田 健司, 高原 祥, 宮崎 礼丈, 小野 耕平, 太田 遥子, SAWADA YUTAKA, KAWABATA TOSHINORI

  第52回地盤工学研究発表会, Sep. 2017, Japanese, 名古屋市, Domestic conference

  Oral presentation


• 津波越流により生じる海岸堤防背後における洗掘形状の推定について

  竹川 尚希, SAWADA YUTAKA, KAWABATA TOSHINORI

  平成29年度農業農村工学会大会講演会, Aug. 2017, Japanese, 藤沢市, Domestic conference

  Oral presentation


• 地盤沈下に伴うポリエチレン管及びその継手部近傍の変形挙動に関する模型実験

  上田 前向, 高原 源太朗, 日野林 譲二, SAWADA YUTAKA, KAWABATA TOSHINORI

  平成29年度農業農村工学会大会講演会, Aug. 2017, Japanese, 藤沢市, Domestic conference

  Oral presentation


• 遮水シート工法により改修されたため池堤体の動的挙動に関する小型振動実験

  重元 凜太郎, 眞木 陸, 澤田 豊, 小竹 望, 鈴木 麻里子, 清水 敬三, 井上 和徳, 神信 浩一, 中澤 博志, 小田 哲也, 河端 俊典

  平成29年度農業農村工学会大会講演会, Aug. 2017, Japanese, 藤沢市, Domestic conference

  Oral presentation


• 基床部の緩みが継手を有するたわみ性埋設管の力学挙動に及ぼす影響

  小野 耕平, 石川 拓也, SAWADA YUTAKA, 春本 朋洋, 森上 浩伸, KAWABATA TOSHINORI

  平成29年度農業農村工学会大会講演会, Aug. 2017, Japanese, 藤沢市, Domestic conference

  Oral presentation


• ため池堤体内に設置されるベントナイト系遮水シートの力学特性に関する検討

  重元 凜太郎, SAWADA YUTAKA, 清水 敬三, 西村 達也, 神信 浩一, KAWABATA TOSHINORI

  平成29年度農業農村工学会大会講演会, Aug. 2017, Japanese, 藤沢市, Domestic conference

  Oral presentation


• ジオグリッドを用いた海岸堤防背後地盤の洗掘対策に関する模型実験

  竹川 尚希, 堀尾 有加, SAWADA YUTAKA, KAWABATA TOSHINORI

  平成29年度農業農村工学会大会講演会, Aug. 2017, Japanese, 藤沢市, Domestic conference

  Oral presentation


• Model Experiment on Earth Pressure Acting on Buried Pipe during Sheet Pile Extraction

  TERADA KENJI, TAKAHARA SHO, ONO KOHEI, SAWADA YUTAKA, Hoe I. Ling, KAWABATA TOSHINORI

  International Conference of Pipeline 2017, ASCE, Aug. 2017, English, Phoenix, Arizona, International conference

  Poster presentation


• 様々な有効応力下における埋設管の水平抵抗力の予測

  小野 耕平, 横田 木綿, 太田 遥子, SAWADA YUTAKA, KAWABATA TOSHINORI

  第52回地盤工学研究発表会, Jul. 2017, Japanese, 名古屋市, Domestic conference

  Oral presentation


• 水平力を受ける埋設管の液状化時の変位特性に関する模型実験

  小野 耕平, 横田 木綿, 太田 遥子, SAWADA YUTAKA, KAWABATA TOSHINORI

  第52回地盤工学研究発表会, Jul. 2017, Japanese, 名古屋市, Domestic conference

  Oral presentation


• ニューマーク法による実物大ため池堤体加振実験の残留すべり解析

  丁 經凡, 白 濟民, SHIBUYA SATORU, KAWABATA TOSHINORI, KATAOKA SATSUKI, SAWADA YUTAKA, 中澤 博志

  第52回地盤工学研究発表会, Jul. 2017, Japanese, 名古屋, Domestic conference

  Oral presentation


• 矢板引抜きによる埋設管のたわみに関するDEM解析

  寺田 健司, 小野 耕平, 高原 祥, 上田 前向, SAWADA YUTAKA, KAWABATA TOSHINORI

  第51回地盤工学研究発表会, Sep. 2016, Japanese, 岡山市, Domestic conference

  Oral presentation


• 地盤のせん断変形を受ける埋設管たわみの予測について

  高原 祥, 泉 明良, 三木 太貴, 小野 耕平, SAWADA YUTAKA, KAWABATA TOSHINORI

  第51回地盤工学研究発表会, Sep. 2016, Japanese, 岡山市, Domestic conference

  Oral presentation


• 異なる動水勾配下における埋設管の水平抵抗力と載荷速度の関係

  小野 耕平, 横田 木綿, 重元 凛太郎, SAWADA YUTAKA, KAWABATA TOSHINORI

  第51回地盤工学研究発表会, Sep. 2016, Japanese, 岡山市, Domestic conference

  Oral presentation


• ベントナイトシートを敷設した小型ため池堤体模型の振動台実験

  丁 經凡, 白 濟民, SHIBUYA SATORU, KAWABATA TOSHINORI, KATAOKA SATSUKI, SAWADA YUTAKA

  第51回地盤工学研究発表会, Sep. 2016, Japanese, 岡山市, Domestic conference

  Oral presentation


• せん断変形を受ける二重構造管の既設管損傷過程を考慮した個別要素法解析

  高原 祥, 泉 明良, 三木 太貴, 小野 耕平, SAWADA YUTAKA, KAWABATA TOSHINORI

  平成28年度農業農村工学会大会講演会, Sep. 2016, Japanese, 仙台市, Domestic conference

  Oral presentation


• 津波越流による海岸堤防裏法尻の最大洗掘深の予測について

  竹川 尚希, SAWADA YUTAKA, 村井 和樹, KAWABATA TOSHINORI

  平成28年度農業農村工学会大会講演会, Aug. 2016, Japanese, 仙台市, Domestic conference

  Oral presentation


• 海岸堤防背後地盤の液状化が津波越流による洗掘に及ぼす影響

  SAWADA YUTAKA, 竹川 尚希, 村井 和樹, KAWABATA TOSHINORI

  平成28年度農業農村工学会大会講演会, Aug. 2016, Japanese, 仙台市, Domestic conference

  Oral presentation


• 液状化地盤における埋設管の水平載荷実験に関するPIV解析

  小野 耕平, 横田 木綿, SAWADA YUTAKA, KAWABATA TOSHINORI

  平成28年度農業農村工学会大会講演会, Aug. 2016, Japanese, 仙台市, Domestic conference

  Oral presentation


• ジオグリッドを用いた補強地盤における埋設管の水平抵抗力と液状化程度の関係

  横田 木綿, 小野 耕平, SAWADA YUTAKA, KAWABATA TOSHINORI

  平成28年度農業農村工学会大会講演会, Aug. 2016, Japanese, 仙台市, Domestic conference

  Oral presentation


• 地盤せん断変形時のたわみ性埋設管に作用する土圧分布に関する考察

  三木 太貴, 泉 明良, SAWADA YUTAKA, KAWABATA TOSHINORI

  平成27年度農業農村工学会京都支部講演会, Nov. 2015, Japanese, 大津市, Domestic conference

  Oral presentation


• 基床厚が埋設管のたわみに与える影響に関する一考察

  高原 祥, 小野 耕平, SAWADA YUTAKA, KAWABATA TOSHINORI

  平成27年度農業農村工学会京都支部講演会, Nov. 2015, Japanese, 大津市, Domestic conference

  Oral presentation


• ため池の耐震調査と整備について～兵庫県の事例～

  小田 哲也, 谷垣 和彦, 野村 純数, KAWABATA TOSHINORI, SAWADA YUTAKA

  平成27年度農業農村工学会京都支部講演会, Nov. 2015, Japanese, 大津市, Domestic conference

  Oral presentation


• 偏心荷重を受ける更生管の力学挙動に関する模型実験

  小野 耕平, 高原 祥, 竹川 尚希, SAWADA YUTAKA, KAWABATA TOSHINORI

  平成27年度農業農村工学会大会講演会, Sep. 2015, Japanese, 岡山市, Domestic conference

  Oral presentation


• 偏心荷重を受ける更生管の力学挙動に関する3次元有限要素解析

  高原 祥, 小野 耕平, SAWADA YUTAKA, KAWABATA TOSHINORI

  平成27年度農業農村工学会大会講演会, Sep. 2015, Japanese, 岡山市, Domestic conference

  Oral presentation


• 地盤のせん断変形がたわみ性管の力学挙動に与える影響

  泉 明良, 三木 太貴, 寺田 健司, SAWADA YUTAKA, KAWABATA TOSHINORI

  平成27年度農業農村工学会大会講演会, Sep. 2015, Japanese, 岡山市, Domestic conference

  Oral presentation


• 衝撃弾性波によるトンネル背面空洞探査に関する実験

  茨田 匠, 浅尾 瞳, SAWADA YUTAKA, KAWABATA TOSHINORI

  平成27年度農業農村工学会大会講演会, Sep. 2015, Japanese, 岡山市, Domestic conference

  Oral presentation


• 繰返しせん断変形を受ける更生管の変形挙動に関するDEM解析

  三木 太貴, 泉 明良, SAWADA YUTAKA, KAWABATA TOSHINORI

  平成27年度農業農村工学会大会講演会, Sep. 2015, Japanese, 岡山市, Domestic conference

  Oral presentation


• 管路更生管の変形挙動に関する繰返しせん断実験

  泉 明良, 三木 太貴, SAWADA YUTAKA, KAWABATA TOSHINORI

  平成27年度農業農村工学会大会講演会, Sep. 2015, Japanese, 岡山市, Domestic conference

  Oral presentation


• 液状化程度の異なる地盤の洗掘に関する検討

  SAWADA YUTAKA, 村井 和樹, KAWABATA TOSHINORI

  平成27年度農業農村工学会大会講演会, Sep. 2015, Japanese, 岡山市, Domestic conference

  Oral presentation


• ドラム遠心載荷装置における大規模津波実験の開発と防波堤基礎の安定性への適用

  三宅 達夫, 角田 紘子, 宮本 順司, 鶴ヶ崎 和博, SAWADA YUTAKA, 前田 健一, 松田 達也

  第50回地盤工学研究発表会, Sep. 2015, Japanese, 札幌市, Domestic conference

  Oral presentation


• ため池堤体土の非排水繰返し載荷に伴う強度低下特性に関する実験的検討

  小林 成太, SAWADA YUTAKA, KAWABATA TOSHINORI, 野村 純数, 小田 哲也, 三輪 顕, 藤澤 大吾, 田平 健二

  平成27年度農業農村工学会大会講演会, Sep. 2015, Japanese, 岡山市, Domestic conference

  Oral presentation


• 農業用パイプラインに用いるダクタイル鋳鉄管の機能診断手法に関する研究

  IBATA TAKUMI, ITANI YOSHINORI, SAWADA YUTAKA, KAWABATA TOSHINORI

  平成26年度農業農村工学会京都支部講演会, Nov. 2014, Japanese, 岐阜, Domestic conference

  Oral presentation


• 竹材による小規模斜面の補強効果に関する検討

  真木 貴也, SAWADA YUTAKA, KAWABATA TOSHINORI

  平成26年度農業農村工学会京都支部講演会, Nov. 2014, Japanese, 岐阜, Domestic conference

  Oral presentation


• 繰り返し載荷を受けるため池堤体土の強度低下特性の検討

  SAWADA YUTAKA, KOBAYASHI SEITA, 泉 明良, 鈴木 麻里子, 小野 耕平, KAWABATA TOSHINORI

  平成26年度農業農村工学会京都支部講演会, Nov. 2014, Japanese, 岐阜, Domestic conference

  Oral presentation


• 埋設管の水平抵抗力と液状化程度の関係

  井谷 昌功, 藤田 信夫, SAWADA YUTAKA, KAWABATA TOSHINORI, 有吉 充, 毛利 栄征

  平成26年度農業農村工学会大会講演会, Aug. 2014, Japanese, 新潟市, Domestic conference

  Oral presentation


• 同一環剛性を有する管厚の異なるたわみ性パイプの遠心力模型実験

  泉 明良, SAWADA YUTAKA, INOUE KAZUYA, KAWABATA TOSHINORI, 日野林 譲二, Hoe I. Ling, 毛利 栄征

  平成26年度農業農村工学会大会講演会, Aug. 2014, Japanese, Domestic conference

  Oral presentation


• 損傷レベルの異なる既設管が更生管変形特性に与える影響に関する遠心力模型実験

  SAWADA YUTAKA, INOUE KAZUYA, 園田 悠介, 小野 耕平, 三木 太貴, 泉 明良, KAWABATA TOSHINORI, 高原 祥, 毛利 栄征, Ling H.I

  平成26年度農業農村工学会大会講演会, Aug. 2014, Japanese, 新潟市, Domestic conference

  Oral presentation


• 衝撃弾性波を用いたコンクリート構造物の背面空洞深さ測定に関する実験

  茨田 匠, 浅尾 瞳, SAWADA YUTAKA, KAWABATA TOSHINORI

  平成26年度農業農村工学会大会講演会, Aug. 2014, Japanese, Domestic conference

  Oral presentation


• 斜面を対象とした竹材の補強効果に関する模型実験

  SAWADA YUTAKA, 甲賀 洋輔, 真木 貴也, KAWABATA TOSHINORI, 横田 木綿

  平成26年度農業農村工学会大会講演会, Aug. 2014, Japanese, 新潟市, Domestic conference

  Oral presentation


• 材料施工分野の広報活動に関する事例紹介

  INOUE KAZUYA, SAWADA YUTAKA, KAWABATA TOSHINORI, TANAKA TSUTOMU

  平成26年度農業農村工学会大会, Aug. 2014, Japanese, 農業農村工学会, 新潟市, Domestic conference

  Oral presentation


• 液状化地盤における断面形状の異なる埋設管の水平抵抗力

  藤田 信夫, 井谷 昌功, SAWADA YUTAKA, KAWABATA TOSHINORI, 有吉 充, 毛利 栄征

  平成26年度農業農村工学会大会講演会, Aug. 2014, Japanese, 新潟市, Domestic conference

  Oral presentation


• せん断変形を受ける埋設管のたわみ量に関する一考察

  SAWADA YUTAKA, 泉 明良, 原田 文, 小林 成太, KAWABATA TOSHINORI

  平成26年度農業農村工学会大会講演会, Aug. 2014, Japanese, 新潟市, Domestic conference

  Oral presentation


• 老朽既設管の影響を受ける更生管力学挙動に関する遠心力模型実験

  SAWADA YUTAKA, 園田 悠介, 小野 耕平, 三木 太貴, 高原 祥, 毛利 栄征, KAWABATA TOSHINORI

  第49回地盤工学研究発表会, Jul. 2014, Japanese, 北九州市, Domestic conference

  Oral presentation


• 竹材を利用した斜面補強に関する実験的検討

  SAWADA YUTAKA, 甲賀 洋輔, 真木 貴也, 横田 木綿, KAWABATA TOSHINORI

  第49回地盤工学研究発表会, Jul. 2014, Japanese, 北九州市, Domestic conference

  Oral presentation


• せん断変形を受ける埋設管のたわみ量の評価

  SAWADA YUTAKA, 泉 明良, 原田 文, 小林 成太, KAWABATA TOSHINORI

  第49回地盤工学研究発表会, Jul. 2014, Japanese, 北九州市, Domestic conference

  Oral presentation


• MECHANICAL CHARACTERISTICS OF ENVIRONMENTALLY-FRIENDLY BIODEGRADABLE RESIN CONCRETE

  Suzuki M, Kubo K, Sawada Y, Kawabata T

  Concrete Innovation Conference 2014, Jun. 2014, English, International conference

  Oral presentation


• 防波堤堤頭部の津波に対する粘り強い構造に関する実験的検証

  SAWADA YUTAKA, 三宅 達夫, 角田 紘子, 鶴ヶ崎 和博, 前田 健一, 今瀬 達也

  第48回地盤工学研究発表会, Jul. 2013, Japanese, 富山市, Domestic conference

  Oral presentation


• 津波に対する防波堤堤頭部基礎捨石マウンドの安定性の検討

  SAWADA YUTAKA, 三宅 達夫, 角田 紘子, 鶴ヶ崎 和博, 前田 健一, 今瀬 達也

  第48回地盤工学研究発表会, Jul. 2013, Japanese, 富山市, Domestic conference

  Oral presentation


• 混成堤の津波被害の形態および規模を考慮した対策効果の検討

  今瀬 達也, 前田 健一, 三宅 達夫, SAWADA YUTAKA, 角田 紘子, 鶴ヶ崎 和博

  第48回地盤工学研究発表会, Jul. 2013, Japanese, 富山市, Domestic conference

  Oral presentation


• 既設宅地を対象とした格子状改良による液状化対策工法の開発（その１）模型実験による合理的な改良形状の検討

  清水 英樹, 平田 昌史, 鶴ヶ崎 和博, SAWADA YUTAKA, 塚本 良道

  第48回地盤工学研究発表会, Jul. 2013, Japanese, 富山市, Domestic conference

  Oral presentation


• 管中混合方式で圧送されたカルシア改質土の材料特性

  前田 敏, 鶴ヶ崎 和博, 西 成孝, 高本 忠志, 草刈 成直, SAWADA YUTAKA

  第67回土木学会年次学術講演会, Sep. 2012, Japanese, 名古屋市, Domestic conference

  Oral presentation


• サンドマスチックの荷重伝達における温度特性

  山崎 智弘, SAWADA YUTAKA

  第67回土木学会年次学術講演会, Sep. 2012, Japanese, 名古屋市, Domestic conference

  Oral presentation


• カルシア改質土の空気圧送実験

  鶴ヶ崎 和博, 前田 敏, 西 成孝, 高本 忠志, 草刈 成直, SAWADA YUTAKA

  第67回土木学会年次学術講演会, Sep. 2012, Japanese, 名古屋市, Domestic conference

  Oral presentation


• 粘性土袋詰め潜堤の安定性および変形特性に関する遠心力模型実験

  鶴ヶ崎 和博, SAWADA YUTAKA, 角田 紘子, 菱沼 由美子, 土田 孝

  第47回地盤工学研究発表会, Jul. 2012, Japanese, 八戸市, Domestic conference

  Oral presentation


• 津波越流時における流れの衝突および乱れによる海底地盤の不安定化と混成堤の被災

  今瀬 達也, 前田 健一, 三宅 達夫, SAWADA YUTAKA, 角田 紘子, 鶴ヶ崎 和博

  第47回地盤工学研究発表会, Jul. 2012, Japanese, 八戸市, Domestic conference

  Oral presentation


• 地震と津波を受ける矢板式護岸に関する遠心力模型実験

  三宅 達夫, SAWADA YUTAKA, 角田 紘子, 鶴ヶ崎 和博, 前田 健一, 今瀬 達也

  第47回地盤工学研究発表会, Jul. 2012, Japanese, 八戸市, Domestic conference

  Oral presentation


• 砂・粘土の互層地盤上の防波堤に関する動的遠心載荷実験

  三宅 達夫, SAWADA YUTAKA, 鶴ヶ崎 和博, 角田 紘子, 菱沼 由美子, 前田 健一, 今瀬 達也, 張 鋒

  第47回地盤工学研究発表会, Jul. 2012, Japanese, 八戸市, Domestic conference

  Oral presentation


• 異なる地盤条件下の洗掘現象に及ぼす間隙圧の影響

  伊藤 嘉, 今瀬 達也, 前田 健一, 三宅 達夫, SAWADA YUTAKA, 角田 紘子, 鶴ヶ崎 和博

  第47回地盤工学研究発表会, Jul. 2012, Japanese, 八戸市, Domestic conference

  Oral presentation


• 粘性土袋詰め潜堤工の安定性に関する遠心模型実験

  鶴ヶ崎 和博, SAWADA YUTAKA, 土田 孝

  第66回土木学会年次学術講演会, Sep. 2011, Japanese, 松山市, Domestic conference

  Oral presentation


• 津波による捨石マウンド－海底地盤への押し波・引き波浸透が及ぼす混成堤の不安定化

  今瀬 達也, 前田 健一, 三宅 達夫, SAWADA YUTAKA

  第66回土木学会年次学術講演会, Sep. 2011, Japanese, 松山市, Domestic conference

  Oral presentation


• 鉛直管による土砂投入時の流動と堆積に関する遠心模型実験およびSPH法解析

  前田 健一, 今瀬 達也, 鶴ヶ崎 和博, SAWADA YUTAKA, 菱沼 由美子

  第66回土木学会年次学術講演会, Sep. 2011, Japanese, 松山市, Domestic conference

  Oral presentation


• 鉛直管を用いた粘性土砂投入に関する遠心模型実験

  鶴ヶ崎 和博, SAWADA YUTAKA, 菱沼 由美子, 今瀬 達也

  第46回地盤工学研究発表会, Jul. 2011, Japanese, 神戸市, Domestic conference

  Oral presentation


• 遠心力場における津波による洗掘の相似則に関する一考察（その２）

  三宅 達夫, SAWADA YUTAKA, 角田 紘子, 鶴ヶ崎 和博, 前田 健一, 今瀬 達也

  第46回地盤工学研究発表会, Jul. 2011, Japanese, 神戸市, Domestic conference

  Oral presentation


• 遠心力場における津波による洗掘の相似則に関する一考察（その１）

  三宅 達夫, SAWADA YUTAKA, 鶴ヶ崎 和博, 角田 紘子, 前田 健一, 今瀬 達也

  第46回地盤工学研究発表会, Jul. 2011, Japanese, 神戸市, Domestic conference

  Oral presentation


• SPH法を用いた捨石マウンド－海底地盤内部の浸透作用が及ぼす混成堤の津波被害要因

  今瀬 達也, 前田 健一, 三宅 達夫, 鶴ヶ崎 和博, SAWADA YUTAKA, 角田 紘子

  第46回地盤工学研究発表会, Jul. 2011, Japanese, 神戸市, Domestic conference

  Oral presentation


• 津波力を受ける捨石マウンド－海底地盤の浸透が与える海岸構造物への影響

  今瀬 達也, 前田 健一, 三宅 達夫, 鶴ヶ崎 和博, SAWADA YUTAKA, 角田 紘子

  第16回計算工学講演会, May 2011, Japanese, 東京都, Domestic conference

  Oral presentation


• 阪南２区人工干潟に敷設した生分解性シートの強度・分解追跡調査

  鶴ヶ崎 和博, 金澤 剛, SAWADA YUTAKA, 西川 俊一郎, 山中 智央, 中山 誠, 森口 芳文, 波左間 令一, 上野山 卓也

  第65回土木学会年次学術講演会, Sep. 2010, Japanese, 札幌市, Domestic conference

  Oral presentation


• 浚渫粘性土上への覆砂工に関する遠心模型実験

  鶴ヶ崎 和博, SAWADA YUTAKA, 菱沼 由美子

  第45回地盤工学研究発表会, Aug. 2010, Japanese, 横浜市, Domestic conference

  Oral presentation


• 津波による防波堤の安定性と開口部の影響に関する遠心模型実験（その２）

  三宅 達夫, SAWADA YUTAKA, 鶴ヶ崎 和博, 角田 紘子, 前田 健一, 今瀬 達也

  第45回地盤工学研究発表会, Aug. 2010, Japanese, 横浜市, Domestic conference

  Oral presentation


• 津波による防波堤の安定性と開口部の影響に関する遠心模型実験（その１）

  三宅 達夫, SAWADA YUTAKA, 鶴ヶ崎 和博, 角田 紘子, 前田 健一, 今瀬 達也

  第45回地盤工学研究発表会, Aug. 2010, Japanese, 横浜市, Domestic conference

  Oral presentation


• 津波が作用する海岸構造物および海底地盤のSPH 法を用いた安定解析

  今瀬 達也, 前田 健一, 坂井 宏隆, 三宅 達夫, SAWADA YUTAKA, 角田 紘子

  第45回地盤工学研究発表会, Aug. 2010, Japanese, 横浜市, Domestic conference

  Oral presentation


• SPH法による津波が作用するケーソン防波堤および海底地盤の安定解析

  今瀬 達也, 前田 健一, 坂井 宏隆, 三宅 達夫, SAWADA YUTAKA, 角田 紘子

  第59回理論応用力学講演会, Jun. 2010, Japanese, 東京都, Domestic conference

  Oral presentation


• Field verification test for buried bend with lightweight thrust restraint using geogrid

  Kawabata T, Sawada Y, Izumi A, Kashiwagi A, Hanazawa T, Okuno S, Suzuki M

  Proceedings of International Geosynthetics Society, May 2010, English, International conference

  Oral presentation


• 内圧管屈曲部背面地盤の補強効果に関する検討

  柏木 歩, SAWADA YUTAKA, KAWABATA TOSHINORI, 毛利 栄征, 有吉 充, 花澤 貴文, 志村 和信, 中島 博文

  平成20年度農業農村工学会京都支部講演会, Nov. 2008, Japanese, 福井市, Domestic conference

  Oral presentation


• 圧力管曲部軽量スラスト防護工法の動的挙動の検討

  泉 明良, KAWABATA TOSHINORI, SAWADA YUTAKA, 毛利 栄征, 有吉 充, UCHIDA KAZUNORI

  平成20年度農業農村工学会京都支部講演会, Nov. 2008, Japanese, 福井市, Domestic conference

  Oral presentation


• 埋設曲管スラスト対策に関する振動台実験

  泉 明良, KAWABATA TOSHINORI, SAWADA YUTAKA, 毛利 栄征, 有吉 充, UCHIDA KAZUNORI

  平成20年度農業農村工学会大会講演会, Aug. 2008, Japanese, 秋田市, Domestic conference

  Oral presentation


• 埋設管曲部軽量スラスト防護工法の現場実証試験

  KAWABATA TOSHINORI, SAWADA YUTAKA, 泉 明良, 花澤 貴文, 戸継 昭人, 平井 貴雄, 武田 久和, 福田 武治

  平成20年度農業農村工学会大会講演会, Aug. 2008, Japanese, 秋田市, Domestic conference

  Oral presentation


• ジオグリッドを用いた曲管部背面地盤の補強効果に関する模型実験

  柏木 歩, KAWABATA TOSHINORI, SAWADA YUTAKA, 毛利 栄征, 花澤 貴文, 志村 和信, 中島 博文

  平成20年度農業農村工学会大会講演会, Aug. 2008, Japanese, 秋田市, Domestic conference

  Oral presentation


• DEMによる曲管部背面地盤の補強効果検討

  SAWADA YUTAKA, 灘本 優太, KAWABATA TOSHINORI, 毛利 栄征, 花澤 貴文, 中島 博文, 志村 和信, UCHIDA KAZUNORI

  平成20年度農業農村工学会大会講演会, Aug. 2008, Japanese, 秋田市, Domestic conference

  Oral presentation


• 埋設管曲部軽量スラスト防護工法の振動台実験

  KAWABATA TOSHINORI, 毛利 栄征, SAWADA YUTAKA, 泉 明良, 有吉 充, 藤本 夏子

  第43回地盤工学研究発表会, Jul. 2008, Japanese, 広島市, Domestic conference

  Oral presentation


• 背面地盤を補強した曲管部の水平載荷実験

  KAWABATA TOSHINORI, SAWADA YUTAKA, 柏木 歩, 花澤 貴文, 毛利 栄征, UCHIDA KAZUNORI

  第43回地盤工学研究発表会, Jul. 2008, Japanese, 広島市, Domestic conference

  Oral presentation


• 背面地盤の補強による曲管部の水平抵抗力増加メカニズム

  SAWADA YUTAKA, KAWABATA TOSHINORI, 毛利 栄征, 灘本 優太, 柏木 歩, UCHIDA KAZUNORI

  第43回地盤工学研究発表会, Jul. 2008, Japanese, 広島市, Domestic conference

  Oral presentation


• 曲管部軽量化スラスト防護工法の有効性の検討

  SAWADA YUTAKA, KAWABATA TOSHINORI, 毛利 栄征, UCHIDA KAZUNORI

  平成18年度農業土木学会大会講演会, Aug. 2007, Japanese, 宇都宮市, Domestic conference

  Oral presentation


• 圧力管曲部軽量スラスト防護工法の内圧負荷実験

  SAWADA YUTAKA, KAWABATA TOSHINORI, 柏木 歩, 毛利 栄征, UCHIDA KAZUNORI

  平成19年度農業土木学会大会講演会, Aug. 2007, Japanese, 松江市, Domestic conference

  Oral presentation


• 圧力管曲部軽量スラスト防護工法の増加水平抵抗力の算定

  SAWADA YUTAKA, KAWABATA TOSHINORI, 毛利 栄征, UCHIDA KAZUNORI

  平成19年度農業土木学会大会講演会, Aug. 2007, Japanese, 松江市, Domestic conference

  Oral presentation


• ジオシンセティックスを用いた曲管部の内圧負荷挙動について

  SAWADA YUTAKA, 大串 賢, KAWABATA TOSHINORI, 戸継 昭人, 弘中 淳一, 毛利 栄征, UCHIDA KAZUNORI

  第42回地盤工学研究発表会, Aug. 2007, Japanese, 名古屋市, Domestic conference

  Oral presentation


• 圧力管屈曲部軽量スラスト防護工法の曲管変位を考慮した増加抵抗力算定式の提案

  SAWADA YUTAKA, KAWABATA TOSHINORI, UCHIDA KAZUNORI, 柏木 歩, 毛利 栄征

  第42回地盤工学研究発表会, Jul. 2007, Japanese, 名古屋市, Domestic conference

  Oral presentation


• ジオシンセティックスを用いた曲管部軽量スラスト防護工法による水平抵抗力の算定

  SAWADA YUTAKA, KAWABATA TOSHINORI, 高見 美和子, 渡邊 康治, UCHIDA KAZUNORI

  第41回地盤工学研究発表会, Aug. 2006, Japanese, 鹿児島市, Domestic conference

  Oral presentation


• 軽量スラスト防護工法に関する水平載荷試験の地表面画像解析

  KAWABATA TOSHINORI, UCHIDA KAZUNORI, SAWADA YUTAKA, 高見 美和子

  第40回地盤工学研究発表会, Jul. 2005, Japanese, 函館市, Domestic conference

  Oral presentation


• 軽量スラスト防護工法における抵抗メカニズムに関するDEM解析

  KAWABATA TOSHINORI, UCHIDA KAZUNORI, SAWADA YUTAKA, 北野 知洋, 中瀬 仁, 平井 貴雄, 斉藤 喜久雄

  第40回地盤工学研究発表会, Jul. 2005, Japanese, 函館市, Domestic conference

  Oral presentation


• 地中構造物の浮上に関する単純せん断試験

  河端 俊典, 内田 一徳, 中瀬 仁, 大石 順司, 澤田 豊

  第39回地盤工学研究発表会, Jul. 2004, Japanese, 地盤工学会, 新潟, Domestic conference

  Oral presentation


• ため池底樋に作用する土圧の検討

  河端 俊典, 内田 一徳, 毛利 栄征, 平井 貴雄, 中瀬 仁, 大石 順司, 澤田 豊

  第39回地盤工学研究発表会, Jul. 2004, Japanese, 地盤工学会, 新潟, Domestic conference

  Oral presentation

• 溜池堤防の動的挙動・侵食メカニズムの解明と省力的地震・豪雨対策の両立

  澤田 豊

  日本学術振興会, 科学研究費助成事業, 基盤研究(A), 神戸大学, 01 Apr. 2024 - 31 Mar. 2027


• 非掘削溜池改修技術－土の吸引圧縮による一石二鳥の効果－

  澤田 豊

  日本学術振興会, 科学研究費助成事業, 挑戦的研究(萌芽), 神戸大学, 30 Jun. 2023 - 31 Mar. 2025


• 溜池に流入する土石流の挙動解明ならびに廃止溜池を活用した治水技術の確立

  澤田 豊, 中澤 博志, 竹川 尚希, 小野 耕平

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Kobe University, Apr. 2021 - Mar. 2024

  本研究は廃止するため池を治水施設として利用する方法を確立するため，土石流がため池内に流入した際の挙動ならびに堤体への衝突荷重を明らかにするとともに堤体の安定性評価と補強を検討するものである． 令和３年度には，ため池内に土石流が流入した場合の基本的な挙動やため池堤体に作用する衝突荷重について検討することを目的に土石流実験を実施した． 土石流実験には，幅300mm，流下斜面長約2000mm，傾斜角45°のアクリル製水路を用いた．水路斜面部には，土石流の流入速度を測定するため，レーザー変位計を3台設置した．また，本年度の主目的である衝撃荷重を測定するため，堤体模型を直壁として，3台の荷重計を設置した．実験は土石流を模擬した砕石（平均粒径5mm）やセラミックビーズ（3mm～30mm）を上部から流下させ，下流の貯水状態を模擬した堤体模型に衝突させた．その際，堤体模型への衝突荷重を計測するとともに，土石流の挙動を明らかにするため，高速度カメラによる撮影を行った．実験条件としては，貯留水による影響を考慮するため，貯水無し,水位20，50，100，150mmに変化させたほか，斜面下端からの距離や流下速度を変えたケースを実施した． 実験の結果，貯水された場合，土石流は，流入後に急激な水位変動を引き起こし，貯水無しの実験で得られた堤体への衝突荷重よりも大きかった．当初期待した貯留水によって，堤体に作用する荷重が低減する効果は確認できなかった．また，貯水が無い場合の荷重は，衝突直後からわずかにではあるが増加し，後から押し寄せる土石流の衝突荷重が前方にまで伝播することが確認された．一方，堤体が無い条件では，低い水位でも土石流の到達距離が短くなる傾向があり，貯水による土石流の減勢効果を確認できた．


• 老朽開水路内に配管される圧力パイプラインの力学挙動の解明と耐震設計手法の確立

  河端 俊典, 井上 一哉, 澤田 豊, 毛利 栄征

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Kobe University, Apr. 2020 - Mar. 2023

  既設開水路内に管路を敷設する開水路内配管工法の確立を目標に，老朽化した開水路内に設置された管路屈曲部を対象にスラスト力を模擬した水平力を負荷する実験を実施してきた．令和2年度に実施した模型実験では，載荷中に模型管が軸方向に回転し，正確に水平抵抗力が計測できていないことが明らかとなった．そこで，令和3年度には，載荷装置を改良し，同条件での実験を実施した．概ね前年度と同様の結論を得たが，水路底板と水路壁が固定された実験条件では，管と開水路模型が一体となり挙動する様子が観察され，前年度と異なる新たな知見を得た．また，管と水路壁の間の距離を変えた条件での実験ケースについて，より詳細な検討を行い，本研究で実施された埋設条件では，距離と抵抗力が概ね線形で近似できることを示すとともに，画像解析を通して，管および水路壁周辺地盤の変形挙動ならびに抵抗力発揮メカニズムを解明した．さらに，既設開水路内に2本の管路が敷設される二条配管時の力学挙動を解明するため，2本の模型管に定荷重を負荷した載荷実験に着手し，現在までに基本ケースの実験を終了した． 上記のスラスト力を受ける管路屈曲部の力学挙動の検討に加え，管底側部の応力集中の緩和を目的としたEPS基礎を提案し，その有効性についても実験的に検証してきた．令和2年度に実施した模型実験では，模型管の外径が165mmと小さく，一部のEPS基礎では，応力集中を抑制する効果が確認できなかった．そこで令和3年度には，模型管の外径を313mmとし，地盤の相対密度を前年度の30%から60%に変更することで，より実際に近い埋設条件を再現した．実験結果よりEPS基礎を用いた全てのケースで管底側部の応力集中を抑制する効果が確認された．


• Seismic behavior of small earth dams under combined effects of heavy rainfall and earthquakes and verification of earthquake resistant countermeasures

  Sawada Yutaka

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Kobe University, Apr. 2018 - Mar. 2021

  These days, heavy rain events are frequent, and there are growing concerns for combined disasters; earthquakes and heavy rains occur at close intervals. In this study, model tests and water-level-measurements were conducted to clarify the rainfall infiltration characteristics of earth dam embankments. Moreover, centrifuge model tests and numerical analyses were conducted to clarify the behavior of the embankments subjected to the combined effects of earthquakes and heavy rains, and to propose countermeasures and verify their effectiveness. The results show that the water level in the embankment rises greatly during heavy rainfall and that the preceding rainfall affects the deformation of the embankment during earthquakes. On the other hand, the cracks caused by the preceding earthquake promote rainfall infiltration and affect the erosion. In addition, the reinforcement of the embankment toe with filter units was effective in suppressing the deformation of the embankment.


• Is it possible to reduce disasters by designing how to destroy structures?

  SAWADA Yutaka

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory), Grant-in-Aid for Challenging Research (Exploratory), Kobe University, Jun. 2018 - Mar. 2020

  There are many cases in which embankments are destroyed caused by erosion or scour due to a heavy rainfall and a huge tsunami. In this study, new countermeasures against erosion and scour for small earth dams and coastal dykes have been proposed, and the possibilities of disaster reduction by promoting erosion of a part of ground has been verified by various experiments. As a result, erosion could be promoted by replacing a part of ground to lightweight materials. The depression formed by promoting erosion could effectively reduce horizontal flow velocity. Moreover, a model experiment on overtopping erosion of a small earth dam with the different crest height has showed that the erosion of the slope complicatedly progresses by the existence of other erosion, stones and roots. Therefore, it is impossible to control erosion of slope by only setting ups and down of crest.


• A study on mechanical behavior of buried pipe bends for improving its seismic resistance and extending the service life

  KAWABATA Toshinori

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Grant-in-Aid for Scientific Research (A), Kobe University, Apr. 2017 - Mar. 2020

  Judging from the damage cases in the Great East Japan Earthquake or past large earthquakes, bends of buried pipelines tend to be weak points during earthquakes. Generally, heavy concrete blocks have been used as a thrust restraint, whereas a more lightweight thrust restraint is required to improve the seismic resistance of pipeline. In this study, various type model experiments have been conducted in order to reveal mechanical behavior of buried bends against lateral movement and establish the new method in which gravel and geogrid are used. As a result, the new thrust restraint has been verified to be effective in liquefied ground and the estimation method for the lateral resistance by the new method has been proposed.


• Scour evaluation and countermeasures for coastal dikes subjected to tsunami overflow under various ground conditions

  SAWADA YUTAKA

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Grant-in-Aid for Young Scientists (B), Kobe University, Apr. 2015 - Mar. 2018

  In the Great East Japan Earthquake, a massive tsunami caused severe damage to coastal structures. It has been reported from field surveys that a local scour at the ground behind coastal dikes was one of causes to a dike failure. Since huge earthquakes are expected in recent future, it is essential to reveal scour process and to suppose effective countermeasures. In this study, flume experiments and vertical jet flow experiments have been conducted to clarify effects of liquefaction on scour characteristics and to verify the effects of the proposed countermeasures. In addition to the model tests, simple equations have been suggested to predict a scour profile. Since the predicted values are approximately corresponding with field data, the proposed methods have been verified to be effective.