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Study on the Behavior of Long-Structures Modeled in a Drum Centrifuge

Research Project

Project/Area Number 63550356
Research Category

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

Allocation TypeSingle-year Grants
Research Field 基礎・土質工学
Research InstitutionUtsunomiya University

Principal Investigator

KUSAKABE Osamu  Univ. of Utsunomiya, Faculty of Engineering, Associate Professor, 工学部, 助教授 (40092548)

Project Period (FY) 1988 – 1989
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1989: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1988: ¥1,500,000 (Direct Cost: ¥1,500,000)
Keywordsdrum centrifuge / model test / earthquake / buried pipe / liquefaction / similarity law / ドラム型遠心装置 / 長周期 / パイプライン / 遠心力模型 / ドラム型遠心 / 長大構造物 / 盛土
Research Abstract

This study is a continuation of our study under the same title conducted from 1989 to 1990. In the previous study we developed a dynamic excitation system in a drum centrifuge. The system had been designed with special purposes for observation of the behavior of long-structures such as pile lines. This study is an application of the dynamic excitation system.
Field observation has revealed that damage of pipelines due to earthquake concentrates in regions of either along boundaries of two different soil types, or liquefied. The damage in the former region had been intensively studied in the previous study. This study thus focused on the development of a modeling system for liquefaction phenomena in the drum centrifuge. The following results were obtained from this particular study.
1) A rectangular container with a series of laminar frame was designed and made. The container was directly fixed on the dynamic excitation system developed in the previous study. The mass of the container with a body of saturated sand was 2.5kg. The height of the sand layer corresponds to 3 meter in a prototype scale at the centrifugal acceleration of 40.
2) In order to examine the similarity law of time in a dynamic behavior under a centrifugal field, two types of liquid for pore fluid were used. They were water and silicon oil, of which viscosity is 30 times larger than that of water. It was confirmed that the scaling law in terms of time is of essence for the study of dynamic behavior, and the correct modeling of viscosity is important.
3) It was observed from a series of tests with deferent accelerations that a sand deposit with the relative density of 40% was fully liquefied under the horizontal acceleration of more than 100 gal. This observation is consistent with the conclusion drawn from field data.
4) It is now envisaged with this developed system that it is highly possible to carry out model tests for the study of behavior of a long structure passing on a liquefied layer.

Report

(3 results)
  • 1990 Final Research Report Summary
  • 1989 Annual Research Report
  • 1988 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] 大草 正則,他: "ドラム型遠心装置内の地震動発生システムを用いたパイプラインの振動実験" 第25回工質工学研究発表会. (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 大草 正則,他: "ドラム型遠心載荷装置を用いた地中埋設管の振動実験" 構造物の基礎と地盤との動的相互作用に関するシンポジウム. 117-122 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Okusa: "Experiments on buried structures during earthquake modeled in a drum centrifuge" The 25th Japan national Conference on soil mechanics and foundation engineering. 1783-1786 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] M. Okusa: "Experiments on buried structures during earthquake modeled in a drum centrifuge" Symposium of Dynamic structure foundation and ground interaction. 117-112 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 日下部治 他: "Design and operation of a drum centrifuge" Gentrifuge 88. 77-82 (1988)

    • Related Report
      1989 Annual Research Report
  • [Publications] 日下部治 他: "Levee failures modeled in a drum cantrifuge" Gentrifuge 88. 301-306 (1988)

    • Related Report
      1989 Annual Research Report
  • [Publications] 日下部治 他: "遠心模型実験 適用事例-動的問題-" 土質工学会誌 土と基礎. 36-8. 83-89 (1988)

    • Related Report
      1989 Annual Research Report
  • [Publications] 斉藤晃一 他: "ドラム型遠心装置内の地震動発生システムの開発" 第24回土質工学研究発表会. 103-104 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 日下部治 他: "Development of an earthquake exciation system in a drum centrifuge" Second International Conference on Geotechnical Earthquake Enginering and Soil Dynamics.(1991)

    • Related Report
      1989 Annual Research Report
  • [Publications] 大草正則 他: "ドラム型遠心載荷装置を用いた地中埋設管の地震時挙動に関する基礎実験" 第25回土質工学研究発表会. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 斉藤晃一: 第24回土質工学研究発表会. 24. (1989)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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