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Effects of soil liquefaction on horizontal subgrade reaction of pile during earthquakes

Research Project

Project/Area Number 62460166
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Building structures/materials
Research InstitutionTokyo Institute of Technology

Principal Investigator

TOKIMATSU Kohji (1988-1989)  Tokyo Institute of Technology Associate Prof., 工学部, 助教授 (50134846)

吉見 吉昭 (1987)  東京工業大学, 工学部, 教授 (90016329)

Co-Investigator(Kenkyū-buntansha) YOSHIMI Yoshiaki  Shimizu Corporation Senior Advisor, 技術研究所, 技術顧問 (90016329)
時松 孝次  東京工業大学, 工学部, 助教授 (50134846)
Project Period (FY) 1987 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥6,600,000 (Direct Cost: ¥6,600,000)
Fiscal Year 1989: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1988: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1987: ¥4,000,000 (Direct Cost: ¥4,000,000)
KeywordsEarthquake / Liquefaction / Numerical analysis / Pile / Sand / Shaking table / Structure / Subgrade reaction / 曲げモーメント / 相互作用 / 不規則波 / 振動実験 / せん断土層 / 水平地盤圧力係数 / 不規則波振動台 / せん断土槽
Research Abstract

Shaking table tests were conducted to study dynamic soil-pile- structure interaction during soil liquefaction. A model sand deposit-pile-structure system was constructed in a large container 4m long, 2m wide and 2 m deep. The container, consisting of stacked steel plates, can allow shear deformation of the soil. Shaking table liquefaction tests were then conducted in which soil density, pile diameter, pile rigidity, thickness of the liquefied layer and input motion were controlling variables. Pore pressure, acceleration, and deformation of soil-pile-structure system, and bending moment of pile were monitored and recorded during the test.
The analysis of shaking table test results together with the basic information indicated that: (1) regardless of the rigidity of pile, the dynamic response of the soil-structure system before liquefaction is significantly influenced by the response of soil deposit, (2) unless the pile is rigid enough, the dynamic response of the soil-structure system after liquefaction is also influenced by the response of soil, and (3) the maximum bending moment of the pile is related better to the maximum deformation of the ground surface than to maximum accelerations measured on the structure and the ground surface.
In order to simulate the above findings, analytical method was developed in which regradation of the coefficient of horizontal subgrade reaction of pile due to liquefaction is taken into account as well as the regradation of soil modulus. Analysis was made for both liquefied and non-liquefied cases, and the results were compared with the measured values. The analytical results including the time histories of acceleration, displacement, and bending moment of pile, and the response spectra of the ground surface and structure, are all in good accord with the observed values, showing that the model used in the analysis is reasonable.

Report

(4 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • 1987 Annual Research Report
  • Research Products

    (27 results)

All Other

All Publications (27 results)

  • [Publications] 時松孝次: "液状化過程における杭の動的挙動" 日本建築学会大会学術講演梗概集. 62-B. 1011-1012 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 能村商栄: "液状化過程における地盤-杭-構造物の挙動" 第24回土質工学研究発表会講演集. 1. 947-948 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 能村商栄: "液状化過程における杭構造物-地盤系の応答解析手法" 日本建築学会大会学術講演梗概集. 64-B. 1399-1400 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 能村商栄: "液状化過程での構造物-杭-地盤系の挙動" 第8回日本地震工学シンポジウム論文集(予定). (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Kohji Tokimatsu: "Soil-Pile-Structure Interaction during Liquefaction" Proc.,2nd International Conference on Geotechnical Earthquake and Soil Dynamics(予定). (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 時松孝次: "地盤の液状化が杭・構造物系の地震応答に与える影響" 日本建築学会構造系論文報告集(予定). (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Kohji Tokimatsu: "Dynamic Behavior of Piles during Soil Liquefaction" Proc., Annual Meeting Architectural Institute of Japan 62-B, p.1011-1012, 1987.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Shoei Nomura: "Behavior of Soil-Pile-Structure System during Soil Liquefaction (part2)" The 24th Japan National Conference on Soil Mechanics and Foundation Engineering, 1, p.947-948, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Shoei Nomura: "Response Analysis Method for Soil-Pile Structure System during Soil Liquefaction" Proc., Annual Meeting Architectural Institute of Japan, 64-B, p.1399-1400, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Shoei Nomura: "Behavior of Structure-Pile-Soil System during Soil Liqufaction" Proc., the 8th Japan Earthquake Engineering Symposium 1990.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Kohji Tokimatsu: "Soil-Pile-Structure Interaction during Liquefaction" Proc., 2nd International Conference on Geotechnical Earthquake and Soil Dynamics, 1991.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Kohji Tokimatsu: "Effects of Soil Liquefaction on the Dynamic Response of Soil-Pile-Structure Systems" Journal of Structural Construction Engineering 1991.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 能村商栄: "液状化過程における地盤-杭-構造物の挙動" 第24回土質工学研究発表会講演集. 1. 947-948 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 能村商栄: "液状化過程における杭構造物-地盤系の応答解析手法" 日本建築学会大会学術講演梗概集. 64-B. 1399-1400 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 能村商栄: "液状化過程での構造物-杭-地盤系の挙動" 第8回日本地震工学シンポジウム論文集. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] Kohji Tokimatsu: "Soil-Pile-Structure Interaction during Liquefaction" Proc.,2ndInternational Conference on Geotechnical Earthquake and Soil Dynamics. (1991)

    • Related Report
      1989 Annual Research Report
  • [Publications] 時松孝次: "地盤の液状化が杭・構造物系の地震応答に与える影響" 日本建築学会構造系論文報告集. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 桑山貴一: 第23回土質工学研究発表会講演集. 23-1. 867-868 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 能村商栄: 第24回土質工学研究発表会講演集. 予定. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 石井雄輔: 第23回土質工学研究発表回講演集. 23-1. 941-942 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 時松孝夫: 日本建築学会大会学術講演梗概集. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 園田勝志: 第22回土質工学研究発表会. 22-1. 835-836 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] 山下敬明: 第22回土質工学研究発表会. 22-1. 783-784 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] 時松孝次: 日本建築学会大会学術講演梗概集. 62-B. 1011-1012 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] 園田勝志: 地震工学,応用地学に関するシンポジウム. 11. 21-22 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] 時松孝次: 基礎工. 15-9. 38-46 (1987)

    • Related Report
      1987 Annual Research Report
  • [Publications] 桑山晋一: 第23回土質工学研究発表会. 23-1. (1988)

    • Related Report
      1987 Annual Research Report

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Published: 1987-04-01   Modified: 2016-04-21  

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