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Study on the allowable deformation of structures in liquefied grounds and appropriate measures against liquefaction

Research Project

Project/Area Number 14550499
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Geotechnical engineering
Research InstitutionTokyo Denki University

Principal Investigator

YASUDA Susumu  Tokyo Denki University, College of Science and Engineering, Professor, 理工学部, 教授 (90192385)

Co-Investigator(Kenkyū-buntansha) KOBAYASHI Toshio  Tokyo Denki University, College of Science and Engineering, Lecturer, 理工学部, 講師 (80147470)
Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2003: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2002: ¥1,000,000 (Direct Cost: ¥1,000,000)
KeywordsLiquefaction / Earthquake / Seismic design / Seismic preparedness / Sandy soil / 砂地盤 / 直接基礎 / 地中構造物
Research Abstract

Liquefaction causes deformation of structures such as settlement of buildings and floatation of manholes. In current design procedure for liquefaction, however, the occurrence of liquefaction is judged only. Deformation of the structures is not evaluated. In the design for Level 2 earthquake motion, which has been introduced recently in new design codes after the 1995 Hyogoken-nambu earthquake, it is necessary to evaluate the deformation because many current countermeasures can not prevent the occurrence of liquefaction. Then, in this research, appropriate evaluation methods for liquefaction-induced deformation of structures and allowable deformation in liquefied grounds were studied by conducting several site investigations, shaking table tests and residual deformation analyses. Simple measure methods against the settlement of houses and the floatation of conduits were developed also. Effectiveness of the developed methods were confirmed by carrying out shaking table testes and seismic response analyses. Main conclusions derived from the research were as follows :
1.A site investigation on the liquefaction-induced settlement of timer houses during the 2000 Tottoriken-seibu earthquake showed that the allowable angle of tilting was almost 1/100.
2.Settlement of tanks and floatation of buried conduits can be evaluated by a residual deformation analysis "ALID." Effectiveness of ground improvement by compaction was also evaluated by this analysis.
3.Effectiveness of gravel drain method can be evaluated by focusing on the settlement of structures even though the improved ground is liquefied under Level 2 earthquake motion.
4.A simple countermeasure method by attaching brads to buried conduits was effective to prevent liquefaction-induced floatation.
5.A lot of sewage manholes floated up during the 2003 Tokachi-oki earthquake. Detailed site investigation revealed that the floatation induced due to the liquefaction of backfilled soils.

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (23 results)

All Other

All Publications (23 results)

  • [Publications] 安田進, 規矩大義 他: "2003年十勝沖地震による音別町の下水道の被害"土木学会第59回年次学術講演会. (印刷中). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 田中智宏, 安田進 他: "レベル2地震動下におけるグラベルドレーン工法の有効性に関する解析"土木学会第59回年次学術講演会. (印刷中). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yasuda, S., Hitomi, T.et al.: "A detailed study on the liquefaction-induced settlement of timber houses during the 2000 Tottoriken-seibu earthquake"Proc.of the 5th International Conference on Case Histories in Geotechnical Engineering. (印刷中). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yasuda, S., Morimoto, I.et al.: "Reconnaissance report on the damage caused by three Japanese earthquakes in 2003"Proc.of the 3^<rd> International Conference on Earthauake Geotechnical Engineering. 1. 14-21 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yasuda, S., Tanaka, H.et al.: "Several shaking table tests and analyses on the effect of countermeasures by sheet piles against liquefaction-induced floatation of a buried duct"Proc.of the 3^<rd> International Conference on Earthauake Geotechnical Engineering. 2. 638-643 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Harada, K., Yasuda, S.et al.: "Comparative study on the effectiveness of compaction as a countermeasure against liquefaction during a strong earthquake"Proc.of the 3^<rd> International Conference on Earthauake Geotechnical Engineering. 2. 561-566 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 安田進, 田中智宏 他: "地中構造物の浮上り対策効果に対するALIDによる解析"土木学会第58回年次学術講演会. III. 245-246 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 安田進, 田中智宏 他: "液状化時の地中構造物の浮上り対策検討"第回地盤工学研究発表会. No.927 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 安田進, 田中智宏 他: "液状化時の地中構造物の浮上りについての検討"第11回目本地震工学シンポジウム. 227-230 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Susumu Yasuda: "Recent Advances in Earthquake Geotechnical Engineering and Microzonation(Edited by A.Ansal)Ch.6を担当執筆"Kluwer Accademic Publishes. 354(32) (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yasuda, S., Hitomi, T., Hashimoto, T.: "A detailed study on the liquefaction-induced settlement of timber houses during the 2000 Tottoriken-seibu earthquake"Proc.of the 5th International Conference on Case Histories in Geotechnical Engineering. (in printing). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yasuda, S., Morimoto, I., Kiku, H., Tanaka, T.: "Reconnaissance report on the damage caused by three Japanese earthquakes in 2003"Proc.of the 3^<rd> International Conference on Earthquake Geotechnical Engineering and 11^<th> International Conference on Soil Dynamics & Earthquake Engineering, Keynote Lecture. Vol.1. 14-21 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yasuda, S., Tanaka, H., Tatsuta, M., Yamashita, J.: "Several shaking table tests and analyzes on the effect of countermeasures by sheet piles against liquefaction-induced floatation of a buried duct"Proceedings of the 3^<rd> International Conference on Earth quake Geotecimical Engineering and 11^<th> International Conference on Soil Dynamics & Earthquake Engineering. Vol.2. 638-643 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Harada, K., Yasuda, S., Yoshida, N., Sato, M, Sento, N.: "Comparative study on the effectiveness of compaction as a countermeasure against liquefaction during a strong earthquake"Proceedings of the 3^<rd> International Conference on Earth quake Geotecimical Engineering and 11^<th> International Conference on Soil Dynamics & Earthquake Engineering. Vol.2. 561-566 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yasuda, S.: "Evaluation of liquefaction-induced deformation of structures. Recent Advances in Earthquake Geotechnical Engineering and Miicrozonation (Edited by A.Ansal), Ch.6"Kluwer Accademic Publishes. 199-230 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Yasuda, S., Morimoto, I.et al.: "Reconnaissance report on the damage caused by three Japanese earthquakes in 2003"Proc.of the 3^<rd> International Conference on Earthquake Geotechnical Engineering. 1. 14-21 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Yasuda, S., Tanaka, H.et al.: "Several shaking table tests and analyses on the effect of countermeasures by sheet piles against liquefaction-induced floatation of a buried duct"Proc.of the 3^<rd> International Conference on Earthquake Geotechnical Engineering. 1. 638-643 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] Yasuda, S., Hitomi, T.et al.: "A detailed study on the liquefaction-induced settlement of timber houses during the 2000 Tottoriken-seibu earthquake"Proc.of the 5th International Conference on Case Histories in Geotechnical Engineering. (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 安田進, 規矩大義, 他: "2003年十勝沖地震による音別町の下水道の被害"土木学会第39回年次学術講演会. (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 田中智宏, 安田進, 他: "レベル2地震動下におけるグラベルドレーン工法の有効性に関する解析"土木学会第39回年次学術講演会. (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 安田 進, 橋本隆雄: "鳥取県西部地震における住宅の液状化による沈下について"土木学会第57回年次学術講演会講演集. III-515. (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 安田 進, 他: "液状化時の地中構造物の浮上り対策検討"第38回地盤工学研究発表会講演集. (CD-ROM). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] 安田 進, 他: "浮上り対策実験に対するALIDによる解析"土木学会第58回年次学術講演会講演集. (CD-ROM). (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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