Collaborative research: Validation of centrifuge and numerical modeling for dynamic behavior of civil infrastructure under earthquakes

• Project/Area Number: 17H00846
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Natural disaster / Disaster prevention science
• Research Institution: Kansai University
• Principal Investigator: Tobita Tetsuo 関西大学, 環境都市工学部, 准教授 (00346058)
• Co-Investigator(Kenkyū-buntansha): 竹村 次朗 東京工業大学, 環境・社会理工学院, 准教授 (40179669) ; 渦岡 良介 京都大学, 防災研究所, 教授 (40333306) ; 岡村 未対 愛媛大学, 理工学研究科(工学系), 教授 (50251624) ; 上田 恭平 京都大学, 防災研究所, 助教 (60649490) ; 一井 康二 関西大学, 社会安全学部, 教授 (70371771)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥35,490,000 (Direct Cost: ¥27,300,000、Indirect Cost: ¥8,190,000); Fiscal Year 2019: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000); Fiscal Year 2018: ¥10,530,000 (Direct Cost: ¥8,100,000、Indirect Cost: ¥2,430,000); Fiscal Year 2017: ¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
• Keywords: 遠心模型実験 / 一斉試験 / 液状化 / 飽和砂地盤 / 地震 / 地盤災害 / 国際共同研究 / 自立式矢板護岸 / 相似則 / 社会基盤施設 / 耐震 / 一斉実験 / 模型実験 / 一斉遠心模型実験 / 一斉数値解析 / 数値解析

Outline of Final Research Achievements

The purpose of this study was to evaluate the disaster prediction accuracy of both centrifugal experiments and numerical methods by simultaneously conducting experiments and analyses by multiple research institutes in Japan and overseas for, and to further improve accuracy. The target of the experiment and numerical analysis was the saturated sand ground under dynamic excitations. The correlation between the relative density of the ground and the input acceleration level was investigated for response acceleration, excess pore water pressure, and ground deformation. As a result of joint simultaneous experiments conducted by 11 international experimental institutions, it was found that the experimental results such as the amount of ground deformation for each institute are in harmony with the overall tendency in a wider range of relative density and input acceleration level. The validity of the model experiment was confirmed.

Academic Significance and Societal Importance of the Research Achievements

本研究の学術的意義は，液状化地盤に対する動的遠心模型実験の妥当性が，複数の国際的学術機関の連携により示されたことにある．実験結果は，インターネット上のデータベースに保存されており，誰でも閲覧できるため，将来，同様の実験または解析を行う際の指標として用いることができる．また，申請者らが提案するの拡張型相似則について，国際的かつ大規模な検証実験が行われ，その妥当性と適用限界を示すことができた．拡張型相似則は，大規模な実構造物を縮小模型で表現する際の理論的解決策を与える方法であり，今後増加すると見込まれる大規模構造物に対する遠心模型実験において利用される機会が増えるものと思われる．

Research Products

• [Int'l Joint Research] University of California, Davis/Rensselaer Polytechnic Institute/George Washington University(米国)
• [Int'l Joint Research] Cambridge University(英国)
• [Int'l Joint Research] 浙江大学(中国)
• [Int'l Joint Research] 韓国科学技術院(韓国)
• [Int'l Joint Research] IFSTTAR(フランス)
• [Int'l Joint Research]
• [Int'l Joint Research] University of California, Davis/Rensselaer Polytechnic Institute (RPI)(米国)
• [Int'l Joint Research] Cambridge University(英国)
• [Int'l Joint Research] IFSTTAR(フランス)
• [Int'l Joint Research] Ziejiang University(中国)
• [Int'l Joint Research] KAIST(韓国)
• [Int'l Joint Research]
• [Int'l Joint Research] University of California, Davis/Rensselaer Polytechnic Institute (RPI)(米国)
• [Int'l Joint Research] Cambridge University(United Kingdom)
• [Int'l Joint Research] IFSTTAR(France)
• [Int'l Joint Research] Ziejiang University(China)
• [Int'l Joint Research] National Central University(Taiwan)
• [Int'l Joint Research]
• [Journal Article] LEAP-GWU-2015 experiment specifications, results, and comparisons (2018)
  • Author(s): Kutter, B. L., Carey, T. J., Hashimoto, T., Zeghal, M., Abdoun, T., Kokkali, P., Madabhushi, G., Haigh, S. K., d'Arezzo, F. B., Madabhushi, S., Hung, W.-Y., Lee, C.J., Cheng, H.-C., Iai, S., Tobita, T., Ashino, T., Ren J., Zhou, Y.G., Chen, Y.-M., Sun, Z.-B., Manzari, M., T.
  • Journal Title: Soil Dynamics and Earthquake Engineering Volume: 113 Pages: 616-628
  • DOI: 10.1016/j.soildyn.2017.05.018
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Liquefaction experiment and analysis projects (LEAP): Summary of observations from the planning phase (2018)
  • Author(s): Manzari Majid T.、Ueda Kyohei、et al.
  • Journal Title: Soil Dynamics and Earthquake Engineering Volume: 印刷中 Pages: 714-743
  • DOI: 10.1016/j.soildyn.2017.05.015
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Stress-strain response of the LEAP-2015 centrifuge tests and numerical predictions (2018)
  • Author(s): Zeghal Mourad、Ueda Kyohei、et al.
  • Journal Title: Soil Dynamics and Earthquake Engineering Volume: 印刷中 Pages: 804-818
  • DOI: 10.1016/j.soildyn.2017.10.014
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Kyoto University LEAP-GWU-2015 tests and the importance of curving the ground surface in centrifuge modelling (2018)
  • Author(s): Tobita, T., Ashino, T., Ren, J. and Iai, S.
  • Journal Title: Soil Dynamics and Earthquake Engineering Volume: 113 Pages: 650-662
  • DOI: 10.1016/j.soildyn.2017.10.012
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] An Investigation about Seismic Behavior of Piled Raft Foundation for Oil Storage Tanks using Centrifuge Modelling (2018)
  • Author(s): Sahraeian, S. M. S., Takemura, J., Seki, S.
  • Journal Title: Soil Dynamics and Earthquake Engineering Volume: 104 Pages: 210-227
  • DOI: 10.1016/j.soildyn.2017.10.010
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Numerical Predictions for Centrifuge Model Tests of a Liquefiable Sloping Ground Using a Strain Space Multiple Mechanism Model Based on the Finite Strain Theory (2018)
  • Author(s): Ueda K. and Iai S.
  • Journal Title: Soil Dynamics and Earthquake Engineering Volume: 113 Pages: 771-792
  • DOI: 10.1016/j.soildyn.2016.11.015
  • NAID: 120006522893
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Pre-shaking effects on volumetric strain and cyclic strength of sand and comparison to unsaturated soils (2018)
  • Author(s): Okamura, M., Nelson, F. and Watanabe, S.
  • Journal Title: Soil Dynamics and Earthquake Engineering Volume: 印刷中 Pages: 307-316
  • DOI: 10.1016/j.soildyn.2018.04.046
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Cyclic threshold shear strain in pore water pressure generation in clay in situ samples (2018)
  • Author(s): Koji Ichii and Takeko Mikami
  • Journal Title: Soils and Foundations Volume: 58(3) Issue: 3 Pages: 756-765
  • DOI: 10.1016/j.sandf.2018.01.005
  • Peer Reviewed / Open Access
• [Journal Article] 地盤改良によるK値増大を考慮した岸壁構造物の動的遠心模型実験 (2018)
  • Author(s): 森鼻 章治, 高橋 英紀, 森川 嘉之, 高野 大樹, 斎藤 智志, 鈴木 亮彦, 竹内 秀克, 一井 康二
  • Journal Title: 土木学会論文集B3（海洋開発） Volume: 74(2)
  • NAID: 130007482529
  • Peer Reviewed
• [Presentation] Centrifuge Tests at Kyoto University for LEAP Project (2018)
  • Author(s): Vargas, R., Tobita, T., Ueda, K., and Yatsugi, H.
  • Organizer: 第53回地盤工学研究発表会
• [Presentation] Centrifuge Tests at Kyoto University for LEAP Project, and a Probabilistic Approach to the Sensitivity of Lateral Spreading to Dr and PGA (2018)
  • Author(s): Vargas, R., Tobita, T., and Ueda, K.
  • Organizer: 第15回日本地震工学シンポジウム
• [Presentation] LEAP-UCD-2017 Centrifuge Test at Kyoto University (2017)
  • Author(s): Tetsuo Tobita, Kyohei Ueda, Vargas Ruben and Hikaru Yatsugi
  • Organizer: LEAP UCD 2017 Workshop
  • Int'l Joint Research
• [Remarks] LEAP Achievement
  • URL: https://wps.itc.kansai-u.ac.jp/tobita/2018/12/12/leap-achievement/
• [Remarks] LEAP
  • URL: http://wps.itc.kansai-u.ac.jp/tobita/2018/11/27/leap/
• [Funded Workshop] LEAP-ASIA 2019 Workshop (2019)