Research activity information

• Mar. 2023 六篠会学術奨励賞 神戸大学農学研究科


• 2023 農業農村工学会京都支部, 研究奨励賞, 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


• Mar. 2014 神戸大学農学研究科, 六篠賞学術奨励賞


• Nov. 2013 地盤工学会, 第48回地盤工学発表会 優秀論文発表者賞


• Nov. 2013 農業農村工学会 京都支部, 第69回農業農村工学会 京都支部研究発表会 研究奨励賞


• Mar. 2012 神戸大学農学研究科, 六篠賞学生賞

• Centrifuge model studies on mechanical behavior of buried pipe with voids surrounding bottom and effectiveness of EPS as countermeasure

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

  Abstract Due to insufficient backfilling and compaction, voids existing around the bottom of a buried pipe can have a negative effect on the mechanical behavior of the pipe. Expanded polystyrene (EPS) has been widely utilized in civil engineering as fill, backfill, moisture cutoff, and impact mitigation materials for falling rocks because of its light weight and workability. In this study, centrifuge model tests were conducted in order to investigate the possibility of pipe failure when voids existed around the bottom of the buried pipe, and the effect of installing EPS blocks as a countermeasure. In the test, a model polyvinyl chloride (PVC) pipe having a diameter of 140 mm was buried in the dry sand and loaded at the ground surface in a centrifugal field of 21G. Cases with voids around the bottom of the buried pipe and with EPS blocks were studied, and the differences in the pipe mechanical behavior under standard backfill conditions were discussed. The loading conditions and the shape of the EPS were varied. The test results showed that the loss of soil around the bottom of the pipe caused a stress concentration by a factor of more than 2.5 compared to the typical burial condition, and could directly cause pipe failure. In addition, it is clear that EPS installation was an effective countermeasure to avoid the risk of insufficient compaction, because it did not significantly affect pipe deformation and strain distribution, although the earth pressure tended to concentrate slightly at the bottom of the pipe.

  Lead, Aug. 2024, ASCE Journal of Geotechnical and Geoenvironmental Engineering, English, International magazine, Co-authored internationally

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• 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.

  Lead, Jul. 2024, Paddy and Water Environment, English, International magazine

  [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.

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

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


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

  Nagatani,T., Ikebata,R., Sonoda,Y., Ito,S., Sawada,Y.

  2024, Indonesian Geotechnical Journal, 3(3) (3), English

  [Refereed]

  Scientific journal


• 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, (N-009) (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.

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


• 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

  2022, Transportation Infrastructure Geotechnology

  Scientific journal


• EFFECT OF GEOGRIDS ON SUPRRESING THE PIPE DEFORMATION DURING SHEET-PILE EXTRACTION

  SONODA Yusuke, TOKUMASU Mizuki, SAWADA Yutaka, KAWABATA Toshinori

  It has been reported that a buried flexible pipe excessively deformed due to the sheet-pile extraction after backfilling. Many studies have been conducted on the design method in consideration of the influence of sheet-pile extraction. However, studies for the aim of establishing methods of reducing pipe deformation are scarce. In this study, a sheet pile pullout tests were conducted to verify the effect of the backfill material integrated using geogrids to prevent the horizontal earth pressure from rapid decreasing, thus suppressing the pipe deformation during sheet-pile extraction. In addition, the separate integration of the base and upper area of the pipe was more effective in suppressing pipe deformation.

  Japan Chapter of International Geosynthetics Society, Oct. 2021, Geosynthetics Engineering Journal, 36, 37 - 44, Japanese


• 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.

  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


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

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

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

  Scientific journal


• Influences of Damage Levels of Outer Aging Pipes on Mechanical Behavior of Rehabilitated Pipes

  SAWADA Yutaka, SONODA Yusuke, ONO Kohei, INOUE Kazuya, MOHRI Yoshiyuki, ARIYOSHI Mitsuru, KAWABATA Toshinori

  Recently, trenchless rehabilitation methods for aging irrigation pipes are often used. In this method, a new pipe is inserted into an aging pipe. Therefore, the rehabilitated pipeline consists of the outer aging pipe and the inner rehabilitated pipe. However, the mechanical influences of the damaged outer pipes on the inner rehabilitated pipes are not clear. In the present study, in order to reveal the influences, model experiments were conducted under the different damage levels of the aging pipe and loading positions. Experimental results indicate that the deflection of the rehabilitated pipe increases according to the damage level of the aging pipe. In addition, the strain concentration occurs at the top and the bottom of the rehabilitated pipe due to the point contact of the edge of the aging pipe. It is also found that the deflection and the strain distribution of the rehabilitated pipe under the eccentric load are significantly affected by the damage level of the aging pipe.

  The Japanese Society of Irrigation, Drainage and Rural Engineering, 2014, Journal of the Agricultural Engineering Society, Japan, 82(3) (3), 157 - 163, Japanese


• Finite element analyses on mechanical behavior of inner rehabilitated pipes affected by outer aging pipes

  Kohei Ono, Yutaka Sawada, Akira Izumi, Taiki Miki, Yusuke Sonoda, Kazuya Inoue, Toshinori Kawabata, Hoe I. Ling, Liming Li, Johji Hinobayashi

  2014, Proceedings of the International Offshore and Polar Engineering Conference, 709 - 714

  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

  2014, Pipelines 2014: From Underground to the Forefront of Innovation and Sustainability - Proceedings of the Pipelines 2014 Conference, 1040 - 1048

  International conference proceedings


• Influence of Non-uniform Bedding on the Mechanical Behavior of Buried Flexible Pipe

  SONODA Yusuke, KAWABATA Toshinori, MORIKAMI Hironobu, DODO Hiroaki, ASAO Hitomi

  In order to clarify the behavior of buried pipe on the non-uniform bedding, experiments and 3-dimentional finite element analyses were conducted. By removing the soil from the valves of the bottom of test pit after backfilling uniformly, loose area was made in the ground. In the analysis, different input parameters made it possible to simulate the non-uniform ground. The pipe behavior was monitored at the three cross sections. Two sections are surrounded by the loosened ground locally. Another is between former two sections. From the results, it was clear that circumferential tensile strain acted on the part of the pipe by local swelling at the sections surrounded by the loosened ground. On the other hand, even circumferential tensile strain did not act but maximum shear strain increased at the middle section because of a kind of twisting force.

  Japan Society of Civil Engineers, 2013, Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)), 69(2) (2), I_779 - I_786, Japanese


• Experiments for buried flexible pipe supported by non-uniform bedding

  Toshinori Kawabata, Yusuke Sonoda, Hitomi Asao, Hironobu Morikami, Hirohumi Nakashima

  2013, Proceedings of the International Offshore and Polar Engineering Conference, 260 - 265

  International conference proceedings


• Mechanical behavior of buried inner rehabilitated pipes affected by aging pipes with different damage level

  Toshinori Kawabata, Yusuke Sonoda, Kohei Ono, Yoshiyuki Mohri, Mitsuru Ariyoshi, Hoe I. Ling

  2013, Proceedings of the International Offshore and Polar Engineering Conference, 710 - 715

  International conference proceedings


• The influence of non-uniform bedding on the mechanical behavior of buried flexible pipe

  Y. Sonoda, T. Kawabata, H. Asao, H. Morikami, H. I. Ling

  2013, Pipelines 2013: Pipelines and Trenchless Construction and Renewals - A Global Perspective - Proceedings of the Pipelines 2013 Conference, 1321 - 1329

  International conference proceedings


• Dynamic behavior for buried flexible pipe subjected to ground shear deformation

  Toshinori Kawabata, Yoshiyuki Iwasaki, Yusuke Sonoda, Yoshiyuki Mohri

  2012, Proceedings of the International Offshore and Polar Engineering Conference, 337 - 342

  International conference proceedings


• Dynamic behavior of buried flexible pipes of varying thickness using the shaking table test

  T. Kawabata, Y. Sonoda, Y. Mohri, M. Ariyoshi, Y. Iwasaki

  2012, Pipelines 2012: Innovations in Design, Construction, Operations, and Maintenance - Doing More with Less - Proceedings of the Pipelines 2012 Conference, 1015 - 1024

  International conference proceedings

• コロナ禍での学生・研究生活

  園田悠介

  Jul. 2022, ジオシンセティックス技術情報, 38(2) (2), 51 - 51, Japanese

• 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


• 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


• 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, 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

  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講演要旨集, Sep. 2024, Japanese


• 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


• 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


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

  Sonoda,Y., Nagatomo,H., Sawada,Y.

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


• 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


• Centrifuge model test on the risk of insufficient compaction and the effect of EPS foundation at the pipe bottom side

  Yusuke SONODA, Yutaka SAWADA, Hoe I. LING, Liming LI, Toshinori KAWABATA

  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


• 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


• 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


• 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


• 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


• 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


• 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

  澤田豊, 井上一哉, 園田悠介, 小野耕平, 三木太貴, 高原祥, 泉明良, 毛利栄征, Ling H.I, 河端俊典

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


• 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

  澤田豊, 園田悠介, 小野耕平, 三木太貴, 高原祥, 毛利栄征, 河端俊典

  第49回地盤工学研究発表会, Jul. 2014, Japanese


• 損傷レベルの異なる老朽 既設管の影響を受ける更生管の力学挙動

  小野耕平, 園田悠介, 三木太貴, 河端俊典, 澤田豊, 毛利 栄征, 有吉充

  平成25年度農業農村工学大会講演会, Sep. 2013, Japanese


• 老朽既設管の影響を受ける更生管力学挙動に関する偏心載荷実験

  小野耕平, 園田悠介, 河端俊典, 三木太貴, 毛利栄征, 有吉充

  第48回地盤工学研究発表会, Jul. 2013, Japanese


• 不均一な地盤条件における埋設管力学挙動に関する模型実験―ロゼット解析法による実験的検討―

  園田悠介, 浅尾瞳, 百々宏晶, 河端俊典

  第48回地盤工学研究発表会, Jul. 2013, Japanese


• 不均一な地盤条件における埋設管力学挙動に関する検討―長軸大口径管を対象とした3次元有限要素法解析

  百々宏晶, 園田悠介, 河端俊典, 村井和樹

  第48回地盤工学研究発表会, Jul. 2013, Japanese


• 周辺地盤密度を考慮した不均一地盤における埋設管力学挙動に関する模型実験

  園田悠介, 河端俊典, 浅尾瞳, 森上浩伸, 中島博文

  農業農村工学会京都支部第69回研究発表会, Nov. 2012, Japanese


• 埋設管周辺部グリッド補強効果に関する単純せん断実験

  園田悠介, 百々宏晶, 河端俊典, 小野耕平, 真木貴也

  農業農村工学会京都支部第69回研究発表会, Nov. 2012, Japanese


• Experiments for Influence by Non-uniform Bedding on Pipe Behavior

  園田悠介, 河端俊典, 森上浩伸, 中島博文, 浅尾瞳

  平成23年度農業農村工学会大会, Sep. 2012, Japanese


• Dynamic Behavior of Flexible Buried Pipe with Rigid Bedding

  甲賀洋輔, 園田悠介, 小野耕平, 河端俊典, 毛利栄征, 有吉充

  平成23年度農業農村工学会大会講演会, Sep. 2012, Japanese


• せん断土槽を用いた同一環剛性を有するたわみ性埋設管の振動台実験に関する一考察

  岩﨑善之, 河端俊典, 毛利栄征, 有吉 充, 甲賀洋輔, 園田悠介, 小野耕平

  第47回地盤工学研究発表会, Jul. 2012, Japanese


• 管厚が地盤のせん断変形を受けるたわみ性埋設管の変形挙動に及ぼす影

  園田悠介, 河端俊典, 岩崎善之, 真木貴也

  第47回地盤工学研究発表会, Jul. 2012, Japanese


• 不均一な地盤条件における埋設管力学挙動に関する模型実験

  園田悠介, 河端俊典, 森上浩伸, 中島博文, 浅尾瞳, 小野耕平, 久保京子, 真木貴也

  第47回地盤工学研究発表会, Jul. 2012, Japanese


• 地盤のせん断変形を受けるたわみ性埋設パイプの変形挙動に関する模型実験

  岩崎善之, 河端俊典, 園田悠介, 甲賀洋輔

  農業農村工学会京都支部第68回研究発表会, Nov. 2011, Japanese


• 管剛性が地盤のせん断変形を受ける埋設管の挙動に与える影響

  岩崎善之, 河端俊典, 園田悠介, 甲賀洋輔

  農業農村工学会京都支部第68回研究発表会, Nov. 2011, Japanese


• 管口径が地盤のせん断変形を受ける埋設管の挙動に及ぼす影響

  岩崎善之, 河端俊典, 園田悠介, 甲賀洋輔

  平成23年度農業農村工学会大会講演会, Sep. 2011, Japanese


• Experimental Verification for Buried Flexible Pipe Subjected to Shear Deformation

  岩﨑善之, 河端俊典, 甲賀洋輔, 園田悠介

  平成23年度農業農村工学会大会講演会, Sep. 2011, Japanese


• 地盤のせん断変形を受けるたわみ性埋設パイプの変形挙動に関する一考察

  岩崎善之, 河端俊典, 園田悠介, 甲賀洋輔

  第46回地盤工学研究発表会, Jul. 2011, Japanese


• 神戸地盤のせん断変形を剛性埋設パイプの浮上に関するDEM解析

  岩崎善之, 河端俊典, 園田悠介, 甲賀洋輔

  第46回地盤工学研究発表会, Jul. 2011, Japanese

• 国際ジオシンセティックス学会 日本支部

  Apr. 2020 - Present


• The Japanese Geotechnical Society

  Apr. 2020 - Present


• The Japanese Society of Irrigation, Drainage and Rural Engineering

  Oct. 2010 - Present

• 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, 泉 明良, 大山 峻一, 竹川 尚希, 小野 耕平, 園田 悠介

  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


• セル補強された土のせん断力学挙動の解明と省力的液状化緩和工法の開発

  園田 悠介

  日本学術振興会, 科学研究費助成事業, 研究活動スタート支援, 神戸大学, Aug. 2023 - Mar. 2025


• 廃止する溜池の治水施設としての活用に関する研究

  園田 悠介

  日本学術振興会, 科学研究費助成事業 特別研究員奨励費, 特別研究員奨励費, 神戸大学, 28 Apr. 2021 - 31 Mar. 2024

  本研究は，溜池の「廃止手法」を確立し，土砂災害の被害を軽減し得る治水施設としての価値を見出そうとするものである．しかし，土石流等の流入に対する溜池堤防の安定性や堰止め効果は全くの未知数である．そのため，本年度は，溜池に土石流が流入した場合の基本的挙動やため池堤体に及ぼす衝突荷重について，特に貯水の影響も考慮した検討を行うことを目的に土石流模型実験を行った． 実験は，幅30cm，傾斜角45°の実験水路を用いて実施した．土石流を模擬した砕石やセラミックビーズを上流から流下させ，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，堤体模型に取り付けた荷重計で衝突荷重を計測するとともに，高速度カメラによる撮影を行い，画像解析から土石流の流入挙動を評価した．また，レーザー変位計を用いて流下速度の計測も行った．実験条件としては，貯留水による影響を考慮するため，貯留水の水位を0cm,2cm,5cm,10cm,15cmに変化させたケースのほか，斜面下端からの距離や流下速度が異なるケースを実施した． 実験の結果，土石流は，潜り込むように貯留水に流入し，急激な水位変動を引き起こすことが明らかとなった．そのため，当初期待していたような，貯留水があることで土石流が減勢する効果よりも，水位変動による影響の方が大きく，貯留水が多い場合には，堤体に作用する荷重が増大する可能性が明らかとなった．一方で，堤体模型が無い状態で土石流材料を流下させた場合に，低い水位でも土石流の流出長さが短くなる傾向があり，定性的ではあるが貯留水による土石流の減勢効果を評価することができた． これら実験結果から明らかとなった衝突荷重や急激な水位変動に関する知見は，溜池堤体に大きな影響をおよぼすファクターであると考えられ，今後の土石流に対する堤体の安定性や破壊メカニズムの解明に極めて重要なものである．

• 廃止により開削された溜池堤防の土砂災害に対する安全性に関する研究

  Apr. 2023 - Present, 農業農村工学会 2023年度「研究グループ」助成金