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TAKEYAMA TomohideGraduate School of Engineering / Department of Civil EngineeringProfessor
Research activity information
■ Award■ Paper
- Nov. 2023, Proceedings of the Kansai Geo-Symposium 2023, 92 - 96, JapaneseStudy on the viscous boundary matrix applying viscous boundaries on model sides and bottom[Refereed]Symposium
- International Journal of Geomate, Mar. 2023, International Journal of GEOMATE, 24(106) (106)[Refereed]Scientific journal
- Elsevier BV, May 2022, Soils and Foundations, 62(4) (4), 101161 - 101161, English[Refereed]Scientific journal
- International Journal of Geomate, Apr. 2022, International Journal of GEOMATE, 22(92) (92), 1 - 8, English[Refereed]Scientific journal
- This study aims to rationalize earthquake and tsunami simulation technology by automatically converting and integrating various data with different description formats (DPP). Specifically, a general-purpose ground model “GridModel” is created using borehole data and numerical elevation models available on the National Land Transport Data Platform, automatically converted into a 3-D finite element model with nodes and boundary conditions, and output as an input file for seismic response analysis software such as FLIP. We have also developed a program that automatically creates input files for T-STOC from the "Cabinet Office Nankai Trough Large Earthquake Model Study Group" data. Furthermore, we have tried to link these automatic input data generation programs to take into account the results of subsidence of the ground surface from seismic response analysis in the tsunami simulation.Japan Society of Civil Engineers, 2022, Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering), 78(2) (2), I_889 - I_894, Japanese[Refereed]Scientific journal
- Dec. 2021, IEEE-ASME TRANSACTIONS ON MECHATRONICS, 26(6) (6), 2881 - 2887, English[Refereed]Scientific journal
- Oct. 2021, JOURNAL OF EARTH SCIENCE, 32(5) (5), 1129 - 1138, English[Refereed]Scientific journal
- Oct. 2021, INTERNATIONAL JOURNAL OF GEOMATE, 21(86) (86), 48 - 54, English[Refereed]Scientific journal
- Sep. 2021, INTERNATIONAL JOURNAL OF GEOMATE, 21(85) (85), 1 - 9, English[Refereed]Scientific journal
- Jun. 2021, INTERNATIONAL JOURNAL OF GEOMATE, 20(82) (82), 161 - 169, English[Refereed]Scientific journal
- 2021, Proceedings of Kansai Geo-Symposium, 9温度勾配による不飽和ベントナイト中の水分移動シミュレーション[Refereed]
- Springer International Publishing, 2021, Challenges and Innovations in Geomechanics, 794 - 801[Refereed]In book
- 2020, Kansai Geo-Symposium論文集, 8, 160 - 165都市全体を対象とした液状化後の地盤沈下現象に関する解析的研究[Refereed]
- 2020, 神戸大学年安全研究センター研究報告, 24, 53 - 65最適化手法を用いた土/水連成問題に対する分離型解法の収束性に関する研究
- 2020, 神戸大学年安全研究センター研究報告, 24, 44 - 52室内試験に基づく繰り返し挙動を表現できる 構成モデルのパラメータ同定方法
- Jan. 2020, Computers and Geotechnics, 117[Refereed]Scientific journal
- Thomas Telford Ltd., Sep. 2019, Geotechnical Research, 6(3) (3), 156 - 176, English[Refereed]Scientific journal
- Aug. 2019, Engineering Geology, 258(14) (14), English[Refereed]Scientific journal
- In the wide area of the eastern part of Tokyo, the ground level is less than mean sea level. This area is more vulnerable to disasters than other areas. If large flood damage such as storm surge should occur in this area, the disaster would be a long-term catastrophe. On the coast of Tokyo Bay, countermeasures have been taken by tide embankments and floodgates. However, considering the damage scale when it occurs, an analysis in this area is very important. In this area, ground settlement occurred and groundwater head dropped because groundwater excessively withdrew by the industrial purpose during the period of economic growth. Currently, the groundwater head recovers and the ground settlement has been subsided. However, due to the groundwater head fluctuation, pore water pressure distribution had been different from hydrostatic pressure distribution. Therefore, in the analysis in this area, it is necessary to consider past groundwater head fluctuation. In this research, the ground settlement and the distribution of pore water pressure are simulated from groundwater level fluctuation over the past 100 years. Then, we conducted the seismic analysis by input the distribution of effective stress calculating from the simulated ground water pressure. The sites analyzed in this research are Tokyo Sea Life Park at the mouth of Arakawa River.Tech Reviews Ltd, May 2019, Journal of Civil Engineering and Construction, 8(2) (2), 41 - 47, English[Refereed]Scientific journal
- Feb. 2019, Journal of Engineering and Construction, 8(1) (1), 13 - 18, English[Refereed]Scientific journal
- National Committee for IUTAM, 2019, NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan, 65, 233 - 233, Japanese
A lack of analytical benchmark solution makes it difficult to verify soil dynamics simulations of nonlinear geotechnical problems. This study makes use of a novel code verification technique, the method of numerically manufactured solutions (MNMS), to overcome such difficulty. Using MNMS, the accuracy of a nonlinear soil dynamics simulation code based on finite element method (FEM) is verified. The orders of the convergence rate of the relative errors with respect to the discretization size are found to be in good agreement with the theoretical values prescribed by the numerical methods.
- 2019, International Journal of Computational Methods, 16(5) (5), English[Refereed]Scientific journal
- 2018, Proceedings of the 7th International Conference on Unsaturated Soils, EnglishNumerical analysis of vacuum consolidation considering dissolved gasses[Refereed]International conference proceedings
- GEOMATE International Society, 2018, International Journal of GEOMATE, 15(51) (51), 1 - 8, English[Refereed]Scientific journal
- Mar. 2017, 都市安全研究センター研究報告, (21) (21), 27 - 35, Japanese地盤動的解析のための試験結果のばらつきを考慮したパラメータ範囲の検討Research institution
- Mar. 2017, 都市安全研究センター研究報告, (21) (21), 49 - 62, JapaneseB 値に与える影響因子とB 値測定手法がせん断挙動に及ぼす影響Research institution
- 2017, Proceedings - IACMAG 2017, 15th International Conference of the International Association for Computer Methods and Advances in Geomechanics, 418 - 424High performance computing for hazard assessment of soil liquefaction in urban regionsInternational conference proceedings
- American Society of Civil Engineers (ASCE), 2017, Geotechnical Special Publication, (289) (289), 471 - 480, English[Refereed]International conference proceedings
- 2017, 都市安全研究センター研究報告, (21) (21), 49 - 62, JapaneseB値に与える影響因子とB値測定手法がせん断挙動に及ぼす影響Research institution
- 2017, 都市安全研究センター研究報告, (21) (21), 27 - 35, Japanese地盤動的解析のための試験結果のばらつきを考慮したパラメータ範囲の検討Research institution
- 2017, Proc. of 19th International Conference on Soil Mechanics and Geotechnical Engineering, 2607 - 2610, EnglishStudy on failure mechanisms of the deep mixing columns reinforced by a shallow mixing layer[Refereed]International conference proceedings
- Aug. 2016, INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS, 13(4) (4), English[Refereed]Scientific journal
- The vacuum consolidation method with prefabricated vertical drains (PVD) is widely used in Japan for soft ground improvent. Negative pressure is applied to soft ground through PVD in this method. However, the transmission process of the pressure is not clearly explained by the experiments or the numerical analyses. In this paper, the comparison was attempted between the experimental results using the soil tank in which soft clay was applied with negative pressure and numerical analysis results. A soil/water coupled elasto-plastic FEM code, DACSAR-MC was used and the output indicates good correlations with the experimental results up to the degree of consolidation of 70%. It appeares the enfluence of the experimental constraints become innegligible in the late stage of consolidation process.Japan Society of Civil Engineers, 2016, 土木学会論文集B3(海洋開発), 72(2) (2), 408 - 413, Japanese[Refereed]Scientific journal
- 2016, International Journal of Geosynthetics and Ground Engineering, English[Refereed]Scientific journal
- 2016, Proc. of the 7th International Conference on Computational Methods, EnglishHigh performance computing for liquefaction hazard assessment with statistical soil models[Refereed]International conference proceedings
- 2016, Proc. of the 12th World Congress on Computational Mechanics, EnglishHigh performance Computing for Assessing Hazard of Earthquake induced Liquefaction in Urban Regions[Refereed]International conference proceedings
- 2016, Journal of JSCE, 4(1) (1), 92 - 105, English[Refereed]Scientific journal
- 2016, Proc. of the 19th Southeast Asian Geotechnical Conference & 2nd AGSSEA Conference, EnglishCentrifuge model tests on deep mixing columns reinforced by a stabilized shallow mixing beneath an embankment[Refereed]International conference proceedings
- 2015, Geomechanics from Micro to Macro - Proceedings of the TC105 ISSMGE International Symposium on Geomechanics from Micro to Macro, IS-Cambridge 2014, 2, 727 - 732Microscopic image of meta-stability of clays[Refereed]International conference proceedings
- 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, 1481 - 1486Simulations of physical models of undercut slope lying on inclined bedding plane[Refereed]International conference proceedings
- Japan Society of Civil Engineers, 2015, Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)), 71(2) (2), I_419 - I_427, Japanese[Refereed]Scientific journal
- The Pneumatic Flow Mixing Method was developed in Japan, in which dredged soft soil is mixed with small amount of chemical binder, usually cement, in a pipe during transporting by compressed air. In some applications, the stabilized soil is temporary placed at provisional space, and is excavated and reclaimed at the final site due to several reasons. In the cases, the stabilized soil in which the chemical reaction has already proceeded is disturbed during the excavation and transportation processes, which causes considerable decrease in the strength at the final site. It is important to investigate the soil disturbance effect for its further applications. The authors have started a research project to investigate the soil disturbance effect on the mechanical properties of cement stabilized soil. The unconfined compression tests were performed on three types of laboratory mixed cement stabilized Kaolin clay, stabilized soil without disturbance and disturbed after 3 or 7 days curing. The study revealed that the soil disturbance influenced the stress - stain behavior of the soils considerably. In this paper, a part of the ongoing research results is presented as well as the soil preparation and test procedure.Institute of Lowland Technology, Saga University, 2015, The Official Journal of the International Association of Lowland Technology, 17(3) (3), 139 - 146, English[Refereed]Scientific journal
- 2015, Proc. of the 7th Regional Symposium on Infrastructure Development, EnglishThe influence of soil disturbance on cement-treated soil strength[Refereed]International conference proceedings
- 2015, Proc. of the International Conference on Soft Ground Engineering, EnglishExperimental and Analytical Study of the Effect of Partial Decrement in Permeability of PVDs on Consolidation[Refereed]International conference proceedings
- 2015, Proc. of Deep Mixing 2015, EnglishDeep Mixing Column Group Reinforcement by a Shallow Mixing Layer Beneath an Embankment[Refereed]International conference proceedings
- 2015, Proc. of the International Conference on Soft Ground Engineering, EnglishCentrifuge Model Tests on the External Failure of DM Columns Fixed by Shallow Stabilization[Refereed]International conference proceedings
- 2015, Proc. of the the International Conference on Computational Methods, EnglishA soil dynamics based liquefaction potential assessment framework for urban sites[Refereed]International conference proceedings
- 2015, International Journal of Material Science and Engineering, 2(1) (1), 20 - 25, EnglishA finite element method to describe the cyclic behavior of saturated soil[Refereed]Scientific journal
- Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, 2015, 15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2015: New Innovations and Sustainability, 2(63) (63), 2144 - 2148, English[Refereed]International conference proceedings
- Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, 2015, 15th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2015: New Innovations and Sustainability, 2(50) (50), 1745 - 1748, English[Refereed]International conference proceedings
- 2014, Theoretical and Applied Mechanics Japan, 62, 141 - 148, English[Refereed]Scientific journal
- 2013, Geotechnical Special Publication, (231) (231), 2101 - 2104, EnglishCentrifuge model tests on influence of slope height on stability of soft clay slopeInternational conference proceedings
- Springer Netherlands, 2013, Geotechnical, Geological and Earthquake Engineering, 25, 163 - 179, English[Refereed]In book
- After the Great East Japan Earthquake occurred on 11 March 2011, many earthquake-induced damages of levees and reclaimed lands were reported. According to the investigation to the failure characteristic of levees summarized by Tohoku Regional Development Bureau of MLIT, damages caused by liquefaction of foundation ground would involve basal settlement and saturated condition of loosening construction materials inside levees submerged under water. This study aims to highlight that initial stress states influenced by passive arch action across a basal deflection plays a dominant role in mechanisms of weakening resistance against liquefaction and will contribute to embankments stability evaluation against earthquake.National Committee for IUTAM, 2013, NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan, 62(0) (0), 114 - 114, Japanese
- 2013, Geotechnical, Geological and Earthquake Engineering, 25, 229 - 239[Refereed]In book
- This paper reports the investigation of ground contamination resulting from Tsunami due to the Great East Japan Earthquake. We visited sites at suburbs of Sendai and Ishinomaki and took soil samples at the sites to analyse heavy metal contamination. Herein, the sites st suburbs of Sendai were chosen as a typical area where any industrial facilities did not exit and the sites at Ishinomaki as a typical area where many industrial facilities were destroyed due to the Tsunami. As conclusion, heavy metal contamination were not found resulting from destroyed industrial facilities but contaminated soils that had been settled under the sea were brought by Tsunami and covers the sites at Ishinomaki.National Committee for IUTAM, 2013, NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan, 62(0) (0), 110 - 110, Japanese
- Aug. 2012, 土木学会年次学術講演会講演概要集(CD-ROM), 67th, ROMBUNNO.VII-066, Japanese東日本大震災における津波由来土壌汚染調査
- Dec. 2011, Unsaturated Soils - Proceedings of the 5th International Conference on Unsaturated Soils, 2, 1337 - 1342
- A sand valley is a conjugate problem of sand heap. A typical geometry of planar valley under constant unit weight lying at the angle of repose is illustrated by two adjacent infinite sand heaps. The rigid body of infinite depth of cohesionless material is considered in two-dimensional quasi-static equilibrium. This study reveals the solutions according to a particular description of stress paths where the principal stress orientation provides additional equation to the two equilibrium equations for analyzing three unknowns of stress variables. Closed-form stress solutions for loose sand valley formed at the angle of repose in the planar two-dimension were derived based on the fixed principal axis hypothesis using the Lamé-Maxwell equations of equilibrium. Paths of principal stresses describe self-weight transfer mechanism under the static equilibrium.National Committee for IUTAM, 2011, NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan, 60(0) (0), 221 - 221, Japanese
- 2010, UNSATURATED SOILS: THEORETICAL AND NUMERICAL ADVANCES IN UNSATURATED SOIL MECHANICS, 711 - +, EnglishA finite element simulator for mechanical behavior of unsaturated earth structures exposed to evaporation and moisturization[Refereed]International conference proceedings
- 2010, 応用力学論文集(CD-ROM), 13, 423 - 430, Japanese築堤シミュレーションにおける設定条件が盛土内応力分布に及ぼす影響[Refereed]
- 土木学会, Sep. 2009, 応用力学論文集, Vol.12,pp.187-194, 187 - 194, JapaneseHPMを用いた土/水連成有限要素解析における水頭の空間離散化[Refereed]Scientific journal
- 2009, Proceedings of the 17th International Conference on Soil Mechanics and Geotechnical Engineering: The Academia and Practice of Geotechnical Engineering, 3, 2139 - 2142, English[Refereed]International conference proceedings
- 神戸大学, 2009, Report of Research Center for Urban Safety and Security Kobe University, 13(13) (13), 1 - 9, Japanese
- Saga University, 2009, The Official Journal of the International Association of Lowland Technology, 11(2) (2), 41 - 46, EnglishSoil\/water coupled analysis for construction management of highway embankments on soft clay[Refereed]Scientific journal
- 2009, Theoretical and Applied Mechanics Japan, 57, 89 - 94Scientific journal
- 2008, ADVANCES IN TRANSPORTATION GEOTECHNICS, 389 - +, EnglishNumerical modelling for life cycle planning of highway embankments on soft foundations[Refereed]International conference proceedings
- Dec. 2007, Proc 13th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, CD-ROM, EnglishAnalysis of embankment by nonlinear contractancy description[Refereed]International conference proceedings
- May 2007, Proceeding of the 16th Southeast Asian Geotechnical Conference, pp.289-296(0) (0), 325 - 331, EnglishCoefficient of earth pressure at-rest derived from the Sekiguchi-Ohta model[Refereed]International conference proceedings
- 2007, First Sri Lankan Geotechnical Society International Conference on Soil and Rock Engineering(CD-ROM)Comparison of original and modified cam clay models extended for K0-consolidated clays
- 2007, First Sri Lankan Geotechnical Society International Conference on Soil and Rock Engineering(CD-ROM)Soil/water coupled F.E. Simulation of field performance of 5 embankments placed on homogeneous clay
- 2006, Geotechnical Special Publication, (156) (156), 440 - 453, English[Refereed]International conference proceedings
- 2005, 21世紀COEプログラム「都市地震工学の発展と体系化」, 96(No.) (No.), 35 - 46地盤動態解析の基礎理論
- 盛土構造物の土/水連成弾・粘塑性有限要素プログラムによる動態解析は,過去何年かの実績によって高い再現性が確認されている.そこで,本研究では軟弱地盤上に盛土構造物を建設する際に講じる対策工法を評価する手段として有限要素プログラムを利用することを目的とし,秋田県,大沢郷に建設された道路盛土を対象に解析を行った.軟弱地盤対策工に関する仮想的なケーススタディの解析結果を用いて軟弱地盤対策工の評価を行った.The Japanese Geotechnical Society, 2004, Proceedings of the Japan National Conference on Geotechnical Engineering, 39, 1325 - 1326
- Sep. 2003, Proc. International Workshop on Geotechnics of Soft Soils, pp.49-62, English15 years continuous settlement of a highway embankment on very soft clay[Refereed]International conference proceedings
- 2021, 地盤工学研究発表会発表講演集(Web), 56thAutomatic Construction of Wide-Area Three-Dimensional Ground Model and Application to FEM Analysis
- 土木学会, 2007, Journal of Applied Mechanics, JSCE, 10, 971 - 982, Japanese
- 2002, 第37回地盤工学研究発表会講演論文集, 1307 - 1308
- 2002, 第37回地盤工学研究発表会講演論文集, 1309 - 1310
- 第57回地盤工学研究発表会, 2022SPH法へのカムクレイモデルの導入と検証Oral presentation
- 第57回地盤工学研究発表会, 2022水蒸気移動を考慮した連続条件式に関する問題点Oral presentation
- 2021年度土木学会関西支部年次学術講演会, 2021過圧密比の深度分布と地表面加速度の相関性
- 第56回地盤工学研究発表会, 2021地盤グリッドモデルを用いた数値解析モデルの自動生成
- 2021動的解析を用いたアーチ効果の液状化への影響評価
- 第56回地盤工学研究発表会, 2021広域の三次元有限要素モデルの自動構築とFEM解析プログラムへの適用
- 第56回地盤工学研究発表会, 2021地盤データの自動構築を目的にした大規模データ検索インベントリ
- 第2回 i-Constructionの推進に関するシンポジウム, 2020液状化沈下変形を対象とした都市広域解析におけるデータ構築方法の現状と課題Oral presentation
- 第55回地盤工学研究発表会, 2020盛土の遠心模型実験に対する動的数値シミュレーションOral presentation
- 第55回地盤工学研究発表会, 2020液状化後の地盤沈下現象に着目した都市全体解析に関する研究~千葉県浦安市における測量結果との比較検討~Oral presentation
- 第55回地盤工学研究発表会, 2020液状化後の地盤沈下現象に着目した都市全体解析に関する研究~解析パラメータの同定~Oral presentation
- 第55回地盤工学研究発表会, 2020粒子法の降雨による斜面崩壊解析への適用Oral presentation
- 第54回地盤工学研究発表会, 2019東京海抜ゼロメートル地帯における液状化解析
- 第54回地盤工学研究発表会, 2019土水連成問題における分離型解法における反復試行の収束時のパラメータの推定
- 土木学会, 2019粒子法による土水連成解析の定式化と多次元解析による検証Oral presentation
- 第53回地盤工学研究発表会, Jul. 2018, Japanese, 地盤工学会, 高松市, Domestic conference分離型解法を用いた土/水連成問題の検討Oral presentation
- 第53回地盤工学研究発表会, Jul. 2018, Japanese, 地盤工学会, 高松市, Domestic conference東京海抜ゼロメートル地帯における地下水位変動に伴う液状化リスクOral presentation
- 第53回地盤工学研究発表会, Jul. 2018, Japanese, 地盤工学会, 高松市, Domestic conferenceデコルマ帯における変質を考慮したせん断シミュレーションOral presentation
- 第53回地盤工学研究発表会, 2018, Japanese, Domestic conference粒子法を用いた浸透破壊解析Oral presentation
- 第53回地盤工学研究発表会, 2018, Japanese, Domestic conference不飽和土/水連成SPH法を用いた斜面崩壊解析Oral presentation
- 第53回地盤工学研究発表会, 2018, Japanese, Domestic conference弾塑性構成理論に用いる下負荷面のニューラルネットワークを用いた同定Oral presentation
- 第53回地盤工学研究発表会, 2018, Japanese, Domestic conferenceニューラルネットワークによるN値分布の推定Oral presentation
- 第21回応用力学講演会, 2018, Japanese, Domestic conferenceFDPSを用いたSPH法による斜面崩壊シミュレーションに関する基礎研究Oral presentation
- 第52 回地盤工学研究発表会, Jul. 2017, Japanese, 地盤工学会, 名古屋市, Domestic conference溶存気体の気化が真空圧密時の地盤内圧力変化に及ぼす影響Oral presentation
- 第52 回地盤工学研究発表会, Jul. 2017, Japanese, 地盤工学会, 名古屋市, Domestic conference不飽和地盤の液状化強度発現に関する解析的研究Oral presentation
- 第52 回地盤工学研究発表会, Jul. 2017, Japanese, 地盤工学会, 名古屋市, Domestic conference地盤動的解析のための試験結果のばらつきを考慮したパラメータ範囲の検討Oral presentation
- 第52 回地盤工学研究発表会, Jul. 2017, Japanese, 地盤工学会, 名古屋市, Domestic conference先行効果を考慮した弾・粘塑性構成モデルの動的解析への適用Oral presentation
- 第52 回地盤工学研究発表会, Jul. 2017, Japanese, 地盤工学会, 名古屋市, Domestic conferenceSPH 法を用いた仮置き盛土に対する安全性検討Oral presentation
- 第52回地盤工学研究発表会, 2017, Japanese, Domestic conferenceSPH 法を用いた浸透破壊解析Oral presentation
- 第51回地盤工学研究発表会, Sep. 2016, Japanese, 地盤工学会, 岡山市, Domestic conference間隙保水特性と非可逆変形特性が B 値発現に及ぼす影響Oral presentation
- 第51回地盤工学研究発表会, Sep. 2016, Japanese, 地盤工学会, 岡山市, Domestic conference海底地盤から採取したサンプリング試料の強度発現メカニズムOral presentation
- 第51回地盤工学研究発表会, Sep. 2016, Japanese, 地盤工学会, 岡山市, Domestic conferenceデコルマ帯における固着メカニズムの解明Oral presentation
- 第51回地盤工学研究発表会, Sep. 2016, Japanese, 地盤工学会, 岡山市, Domestic conferenceジオテキスタイル補強土構造物における補強効果の検討Oral presentation
- 第51回地盤工学研究発表会, 2016, Japanese, Domestic conference本設杭として利用するソイルセメント柱列壁の実台鉛直載荷試験の再現解析Oral presentation
- 第51回地盤工学研究発表会, 2016, Japanese, Domestic conference地盤情報データベースを使用した動的解析の自動化に関する研究Oral presentation
- 第51回地盤工学研究発表会, 2016, Japanese, Domestic conferenceSPH法を使用した不飽和非定常浸透流解析における流量境界条件の改良Oral presentation
- 第51回地盤工学研究発表会, 2016, English, Domestic conferenceCentrifuge model tests on internal failure of DM columns reinforced by a stabilized shallow layerOral presentation
- 第50回地盤工学研究発表会, 2015, Japanese, Domestic conference養生中に攪乱を受けた改良土の強度予測に関する研究Oral presentation
- 第50回地盤工学研究発表会, 2015, Japanese, Domestic conference土/水連成を考慮したSPH法の斜面崩壊解析への適用Oral presentation
- 第50回地盤工学研究発表会, 2015, Japanese, Domestic conference拘束圧を受けるセメント改良地盤の破壊挙動に関する研究Oral presentation
- 第50回地盤工学研究発表会, 2015, Japanese, Domestic conferencePVDの部分的な透水係数低下における圧密に及ぼす影響の実験的検討Oral presentation
- 第49回地盤工学研究発表会, 2014バーチカルドレーンの透水性低下が圧密遅れに及ぼす影響に関する室内模型実験
- 第49回地盤工学研究発表会, 2014浚渫埋立土の圧力を受ける盛土の変位挙動に関する遠心模型実験
- 第49回地盤工学研究発表会, 2013養生中に攪乱を受けたセメント改良土の材料特性に関する研究
- 第48回地盤工学研究発表会, 2013軟弱粘土斜面における杭式深層混合処理工法の変形挙動
- 第48回地盤工学研究発表会, 2013折れ曲りを受けるバーチカルドレーンの透水性の評価に関する研究
- 第48回地盤工学研究発表会, 2013セメント改良土の破壊挙動に関する遠心模型実験とSPH法による解析
- 第48回地盤工学研究発表会, 2013滑動する斜面上杭基礎構造物の地震時挙動に関する解析的研究
- 第62回理論応用力学講演会, 2013東日本大震災の津波による地盤塩害及び土壌汚染調査・分析
- 第62回理論応用力学講演会, 2013Central pressure drop induced by passive arch action of materials prone to liquefaction underneath embankments due to basal settlement
- 第67回土木学会年次学術講演会, 2012東北大震災における津波由来土壌汚染調査
- 第47回地盤工学研究発表会, 2012杭式深層混合処理による斜面の安定性に関する遠心実験
- 第47回地盤工学研究発表会, 2012粘土地盤中のバーチカルドレーンの圧密過程における折れ曲がり挙動に関する実験
- 第47回地盤工学研究発表会, 2012地すべり抑止工の宅地盛土耐震化への適用に関する研究
- 第46回地盤工学研究発表会, 2011粒子法を用いた地盤の挙動解析のための基礎的検討
- 第46回地盤工学研究発表会, 2011Analytic solutions for stresses in an inverted conical sand valley with principal axes polarized everywhere
- 第46回地盤工学研究発表会, 2011高地下水面を有する盛土構造物の崩壊機構の把握と鋼管杭を応用した耐震性改善の提案
- 第46回地盤工学研究発表会講演集, 2011偏心荷重を受ける砂地盤中の浅い基礎の支持力と根入れ効果に関する遠心模型実験
- 第46回地盤工学研究発表会, 2011パイプの存在が盛土の地震時安定性に与える影響
- 第46回地盤工学研究発表会, 2011斜面と杭基礎構造物の地震時相互作用に関する研究
- 第7回地盤工学会関東支部発表会, 2010分極主応力軸過程に基づいた平面砂丘問題のエアリーの応力関数解
- 第45回地盤工学研究発表会, 2010安息角で形成された平面状斜面における固定主応力軸を仮定した応力解析
- The 17th Southeast Asian Geotechnical Conference, 2010Analysis of groundwater influence and destabilized mechanisms of the Guinsaugon rockslide
- The 45th National Conference of Japan Geotechnical Engineering, 2010Stress analysis of planar slopes inclined at the angle of repose with fixed principal axes
- 第44回地盤工学研究発表会, 2009赤井・田村(1978)による水頭の空間離散化手法の拡張と適用限界
- 第44回地盤工学研究発表会, 2009ハイブリッド型ペナルティ法を用いた土/水連成有限要素解析
- Proceedings of the 14th National Convention on Civil Engineering, 2009A study of deformation behaviour of an instrumented slope subjected to rainfall near Thadan Dam, Thailand
- UNSAT-ASIA2009, 2009A finite element simulator for mechanical behavior of unsaturated earth structures exposed to evaporation and moisturization
- 土木学会第63回年次学術講演会, 2008施工速度の違いが盛土基礎地盤の変形に与える影響
- 第5回地盤工学会関東支部研究発表会, 2008真空圧密による改良域のモデル化
- 第5回地盤工学会関東支部研究発表会, 20081次元圧密解析による盛土の沈下計算-現場実測データならびに2次元土・水連成解析とくらべて-
- 第43回地盤工学研究発表会, 2008密度の相違を考慮した砂の構成モデルとそのパラメータの決定法
- 第43回地盤工学研究発表会, 2008非線形コントラクタンシー表現関数のパラメータに関する研究
- 第43回地盤工学研究発表会, 2008締固め材料の圧密・せん断・強度特性
- 第43回地盤工学研究発表会, 2008関口・太田モデルの特異点における負荷判定法
- 第5回地盤工学会関東支部発表会, 2008陰解応力積分法を導入した地盤構成式の検討
- 第43回地盤工学研究発表会, 2008マクロエレメント法の真空圧密工法への適用(その2)
- 第43回地盤工学研究発表会, 2008マクロエレメント法の真空圧密工法への適用(その1)
- 第57回理論応用力学講演会, 2008Domain of metastability at the corner of the Sekiguchi-Ohta model
- 第4回地盤工学会関東支部研究発表会, 2007オリジナル・カムクレイと修正カムクレイの比較―故きを温め,新しきを知る―
- 第42回地盤工学研究発表会, 2007関口・太田による弾粘塑性構成モデルにおける負荷判定の改良
- 第42回地盤工学研究発表会, 2007弾塑性構成モデルのMetastability特性とその定量化
- 第42回地盤工学研究発表会, 2007関口・太田モデルにおける陽解積分法を用いた応力更新アルゴリズム
- 第42回地盤工学研究発表会, 2007盛土を載荷した軟弱地盤の力学挙動に対するClass A予測
- 第42回地盤工学研究発表会, 2007アセットマネジメントにおける道路盛土の長期沈下・変形解析の適用性
- 第42回地盤工学研究発表会講演集, 2007土/水連成圧密解析における許容最小時間増分に関する検討
- the 16th Southeast Asian Geotechnical Conference, Geotechnical Innovations in Practice, Tsunami and Debris Flow, 2007Coefficient of earth pressure at-rest derived from the Sekiguchi-Ohta model
- the 13th Asian Regional Conference of Soil Mechanics and Geotechnical Engineering, 2007Analysis of Embankment by Nonlinear Contractancy Description
- 第41回地盤工学研究発表会, 2006関口・太田による弾・粘塑性モデルにおける応力緩和項へのマクローリン展開の適用
- 第3回地盤工学会関東支部研究発表会講演集, 2006関口・太田モデルにおける特異点処理法
- 第41回地盤工学研究発表会講演集, 2006一次関数近似を用いた水頭の空間離散化,第41回地盤工学研究発表会講演集
- 第3回地盤工学会関東支部研究発表会講演集,, 2006異方圧密粘土を想定した弾塑性構成モデルの破壊条件とK0条件の理論式
- 第96回工学地震学・地震工学談話会, 2005地盤動態解析の基礎理論
- 第40回地盤工学研究発表会講演集, 2005数値微分による弾塑性剛性係数の導出と有限要素解析への適用
- 第40回地盤工学研究発表会講演集, 2005応力更新に陰解積分法を用いた土/水連成弾塑性有限要素プログラムの開発
- 第40回地盤工学研究発表会講演集, 2005陰解積分法を用いた関口・太田による弾・粘塑性モデルに対する応力更新アルゴリズム
- Proceedings of the 16th International Conference on Soil Mechanics and Geotechnical Engineering, 2005Deformation of embankments on soft ground -better computer simulation resulted from in-put data close to the reality-
- Geothechnical Special Publication Geomechaics Ⅱ Testing, Modeling and Simulation, 2005Performance of 5 embankments on soft clay foundation
- 第39回地盤工学研究発表会, 2004盛土構造物の建設における軟弱地盤対策工の工学的評価
- 第39回地盤工学研究発表会, 2004長期供用後の地盤調査と挙動解析による軟弱地盤上の道路盛土の性能評価
- 第38回地盤工学研究発表会, 2003有明粘土地盤における静止土圧係数および限界状態定数推定法の精査
- 第38回地盤工学研究発表会, 2003有明粘土地盤における静止土圧係数および限界状態定数推定法の精査
- 第37回地盤工学研究発表会, 2002軟弱地盤上の盛土構造物の挙動解析‐施工過程の詳細な再現‐
- 第37回地盤工学研究発表会, 2002軟弱地盤上の盛土構造物の挙動解析‐長期的な性能‐
■ Research Themes
- 日本学術振興会, 科学研究費助成事業, 基盤研究(B), 神戸大学, 01 Apr. 2021 - 31 Mar. 2024災害脆弱性を指標にした土砂災害起源の複合災害の条件付き災害発生確率に関する研究本課題では,洪水・土砂複合災害の結果としての浸水災害を対象にして,地域のリアルタイム浸水予測可能性を論じようとしている.具体的には,詳細な降雨分布や個別の斜面崩壊場所に依存して浸水が発生する集落の浸水発生の予測可能性を主な研究対象とし,異なる研究分野で開発されたHPCシミュレーションの手法に観測情報を組み合わせて高度化を実施している.その関係を知識として蓄えることでリアルタイム浸水災害発生を予測する可能性を論じる.具体的には,以下の項目を行ってきた. 土砂洪水氾濫シミュレーションによる土砂災害起源の洪水災害の脆弱性(山野井):土砂の輸送・堆積過程を含む洪水土砂氾濫解析プログラムを用いて多数の土砂洪水氾濫シミュレーションを実施する仕組みを実装して,スーパーコンピュータ「富岳」を用いて多数シミュレーションを異なる対象地域で実施した. 多数の斜面崩壊シミュレーションによる斜面崩壊時の不安定土砂の量と流下距離の計算(竹山・大石):斜面崩壊シミュレーションプログラムに地形と地質データを入力して実斜面スケールでの計算を実施する仕組みを実装して,スーパーコンピュータ「富岳」およびOakforest-PACSで計算実行した.詳細な気象シミュレーション(富田・梶川):平成30年西日本豪雨を対象に大雨発生事例をスーパーコンピュータ「富岳」で詳細に再現して降雨情報提供に目処をつけた.異なるHPCI-IDシミュレーションの連結(大谷・竹山・山野井・大石):データ処理プラットフォームを用いて高精細気象シミュレーションと洪水土砂氾濫解析を疎結合することを試み,ライブラリの構成,スクリプトを用いてライブラリを活用する方法を取りまとめた.角田地区での斜面崩壊実験によるシミュレーション精度検証(阿波田・竹山・大石):実施準備をして2022年度の実施計画を立てた.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), Kobe University, Apr. 2020 - Mar. 2023, Principal investigator東京東部低地における液状化等による防潮施設の被害予測本研究では,東京東部低地の地震応答・液状化シミュレーションを行い,防潮施設や治水施設に与える被害の程度を評価することを目的としている.そのシミュレーションを実施するためにボーリング調査結果等を利用して三次元地盤モデルを作成し,地震計測結果を用いてその精度を継続的に向上させることができる手法の構築を行う.ボーリング調査には主に標準貫入試験結果としてのN値が含まれる.N値からは強度や剛性に関係するパラメータを推定することができるが,その地盤が経験してきた応力履歴を表すパラメータである先行上載圧(過去その地盤が受けた最大の上載荷重)または過圧密比(現在の上載荷重に対する先行上載圧の比)はN値とは相関性がないため推定することができない.したがって,本研究では,過圧密比を過去の地震計測結果とシミュレーションを基に機械学習によって推定することを考えている.令和2年度において,N値を固定して過圧密比以外のパラメータを推定し,過圧密比の深度分布を様々に変えた仮想的な地盤に対して地震応答解析を実施し,基盤への入力加速度および地表面加速度の時刻歴を入力とし,過圧密比の深度分布を出力とするニューラルネットワークを多数の地震応答解析結果を教師データとして,学習させることにより,精度よく過圧密比の深度分布推定を行うことができることを確認した.令和3年度においては,N値を変化させた場合も同様の推定が可能であることを確認した.また,広域の地震応答解析を行うために解析コードをGPU(Graphic processing units)を用いて並列化した.コード並列化の際,保守・拡張が容易にできるように可読性を重視し,新しいデータ構造について提案をし,実装を行った.これにより4万要素を用いて液状化解析を行い,CPUのみの計算に比べて約7倍の速度向上が確認された.
- 学術研究助成基金助成金/基盤研究(C), Apr. 2018 - Mar. 2021, CoinvestigatorCompetitive research funding
- 学術研究助成基金助成金/若手研究(B), Apr. 2017 - Mar. 2019, Principal investigatorCompetitive research funding
- 鉄道総合技術研究所, 共同研究, 2017 - 2019, Principal investigator損傷過程を考慮可能な盛土の解析手法に関する研究
- 株式会社 大林組, 共同研究, 2016 - 2019, Principal investigator地盤の浸透破壊の予測技術の高度化
- 学術研究助成基金助成金/挑戦的萌芽研究, Apr. 2016 - Mar. 2018, CoinvestigatorCompetitive research funding
- 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), Kyoto University, Apr. 2015 - Mar. 2018, CoinvestigatorExperimental and theoretical diagnosis of arch collapse with liquefaction in embankment constructed on soft ground subjected to seismic loadingIn this study, dynamic centrifuge model tests of an embankment placing on rigid base and soft base modelled by urethane were conducted to investigate the liquefaction resistance in association with the change of the stress distribution inside embankments due to basal subsidence. Experimental results reveal that lateral spreading deformation causes reduction in horizontal earth pressure along the bottom of highly-compacted embankments due to concave settlement of the base. Moreover, arch action was formed underneath the core of embankment as reduction in vertical earth pressure was observed due to the basal subsidence and loosening of inner zone after submersion in Metalose supplied inside the embankment. Comparisons between embankments built on the urethane ground and those built on rigid ground imply that basal subsidence decreases liquefaction resistance in embankments during an earthquake.
- 前田建設 株式会社, 共同研究, 2016 - 2017, Principal investigator地盤工学に関わる周辺環境の影響と問題発生メカニズムの工学的検討
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), Tokyo Institute of Technology, Apr. 2013 - Mar. 2016, CoinvestigatorOn the impact of deterioration of soils due to seepage-induced internal erosion on seismic performance of existing embankmentInternal erosion has a certain impact on seismic performance of existing embankment. To evaluate conditions of the embankment before earthquake, deterioration process of soil/geotechnical structure due to seepage flow is needed to be understood. In this research, suffusion is focused on among the various modes of the internal erosion. Physical model tests and numerical simulations are conducted to examine the seepage-induced suffusion process in the embankment. Optical quantification of suffusion in plane strain physical model is successfully made using digital microscope. A plane strain erosion apparatus equipped with microscope observation is developed, which allows detailed observation of the deterioration process and investigation of the mechanical consequences of soils subjected to internal erosion.
- 科学研究費補助金/基盤研究(B), Apr. 2012 - Mar. 2016, CoinvestigatorCompetitive research funding
- 株式会社 大林組, 受託研究, 2015 - 2015, Principal investigatorソイルセメント柱列壁の実大載荷試験のシミュレーション
- 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), Tokyo Institute of Technology, 2011 - 2012, Coinvestigator not use grantsMonitoring technique development for stress distribution in groundslopes based on the Lame-Maxwell equations of equilibriumThis research aims to investigate the basic concept of load transfer mechanisms by focusing on physical model tests and theoretical analysis of the stress field. In order to perform a quantitative evaluation by stress analysis based on the Lame-Maxwell equations of equilibrium, theoretical solutions of stress distribution in sand heap, sand valley, earth retaining wall and slope were developed and verified by physical models. Finally, the use of the cylindrical air gypsum plaster on the slopes as a monitoring method of principal stress direction stress was examined by observing the direction of the crack.
- 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, 2009 - 2011, CoinvestigatorSalt damage/Ground deformation Mechanism and its repair method using porous ceramic particles made from paper sludgeIt is well known that salt rock layer is widely deposited under the Eurasian basement. Underground water contains weakly salt where the salt rock layer is occasionally deposited near the ground surface. Such a typical example can be seen in the northeast area of Thailand. Agricultural productivity decreases due to the salt damage of that the salty ground water level gradually rises resulting in appearance of salt crystals on the ground surface associated with annual repeat of rainy and dry seasons. This research project is intended to develop a numerical computation technique to reveal the mechanism of salt damage which will lead desertification. On the other hand, paper sludge discharged from paper manufacture causes a serious environmental problem. Such sludge can be changed to porous stable ceramic materials by burning it at 1300 degrees. This research project also aims at utilizing such materials to protect and repair the salt damage.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research, Grant-in-Aid for Challenging Exploratory Research, Tokyo Institute of Technology, 2009 - 2010, Coinvestigator干潟に生息する二枚貝の生態行動の土質力学的解明とその数値モデル化本研究は、干潟に生息する二枚貝に着目しその生態行動を一連の土質力学的問題として分解して、二枚貝の生態行動を数値モデル化することを目的とし、初年度では干潟でアサリとシオフキを対象として二枚貝の潜砂挙動の観察を行い、地盤上に水平に横たわる二枚貝は「足を突っ込む」「体を立てる」「体を引き込む」という3つの段階を経て地盤内に潜るということを明らかにした。 上記の成果を元に,本年度は二枚貝が生息可能な地盤条件を推定可能な理論モデルの構築を行った。理論モデルは、干潟材料を摩擦性の剛塑性体と仮定し、基礎の極限支持力解の3種を援用するものである。「足を突っ込む」行為は、円錐物体の貫入問題としてモデル化されうる。すなわち二枚貝の足を基礎とみなし、基礎の極限支持力と足の伸長力による設置厚を比較することで、地盤の破壊、すなわち貫入が可能であると判定するものである。ここで二枚貝の足幅を殻長の1/4、足の円錐頂角を30度、足の伸長力を殻長に比例するとの仮定ものとで理論計算を行うと、殻長20cmの二枚貝は、干潟の相対密度が60%程度までは足を突っ込めるが相対密度80%では不可能になることが導け、生息可能な干潟の地盤力学的パラメータとの関連が明らかとなった。次に「体を立てる」行為は、剛体の力学モデルによる転倒判定と拡張された浅い基礎の支持力問題として解釈が可能である。転倒しない場合は、二枚貝の体を基礎とみなし、基礎の極限支持力と、自重および足の収縮力との合力による接地圧の比較から地盤破壊が判定される。その結果、殻長とともに水位が大きく影響していることが導ける。 このように、理論支持力モデルによって、干潟の密度、水位条件によって二枚貝の生息範囲が限定されることが明らかとなった。さらに二枚貝は相対密度の高い締まった地盤では、自らの体を傾斜させることで低下する基礎の極限支持力を巧みに利用していることも、支持力モデルから説明可能であることが明らかとなった。
- 厚生労働科学研究費補助金, 2008 - 2010, Coinvestigator土砂崩壊防止のための対策工に関する研究
- 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), Tokyo Institute of Technology, 2008 - 2010, CoinvestigatorFundamental study on seismic stability of tunnels in weakly cemented soil and its countermeasuresTunnels in weakly cemented or no-cemented soils are susceptible to damages by ground motions or displacements caused by earthquake. In order to investigate complicated seismic soil-structure interaction of such tunnels, various model testing techniques has been developed, such as an active type shear box and a fault simulators. Three specific conditions were considered in this study, namely, 1) shallow tunnels which are subjected to shear deformation of grounds, 2) Tunnels in weak ground which is subjected to large earth pressure, and 3) tunnels in an alluvium subjected to fault displacement. From the model test results and numerical simulation, typical deformation and failure mechanism of these tunnels are scrutinized and effective countermeasures against them are discussed.