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Study of the Applicability of a Drum Centrifuge to Model the Process Self-weight Consolidation of a Soft Clay

Research Project

Project/Area Number 01850112
Research Category

Grant-in-Aid for Developmental Scientific Research (B).

Allocation TypeSingle-year Grants
Research Field 基礎・土質工学
Research InstitutionUniversity of Utsunomiya

Principal Investigator

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

Co-Investigator(Kenkyū-buntansha) MIYAKE Tatsuo  Toyo Construction Co., Ltd., Technical Research Institute, Chief Research Engine, 技術研究所, 主任研究員
HAGIWARA Toshiyuki  Univ. of Utsunomiya, Faculty of Engineering, Research Associate, 工学部, 助手 (60189462)
YOKOYAMA Yukimitsu  Univ. of Utsunomiya, Faculty of Engineering, Professor, 工学部, 教授 (20174881)
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1990: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1989: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsSoft Clay / Self-weight consolidation / Drum centrifuge / Soil test / Model test / Elastic analysis / 土質試験 / 圧密 / 粘土 / 遠心実験 / 試験法 / 軟弱地盤
Research Abstract

This study developed a small drum centrifuge for easy observation of the phenomena of self-weight consolidation of a soft clay and quick evaluation of consolidation parameters. The results of this study may be summarized in the following seven points :
1) A small drum centrifuge was designed and constructed. The drum centrifuge has a diameter of 0.2 m, a width of 0.07m, a depth of 0.065m and can be spun up to settlement data with time are obtained by visual readings of surface settlement.
2) Four various clays with plasticity indices of 57.8, 42.7, 29.4 and 22.0 were used and 35 tests in total were conducted, confirming the repeatability of the tests.
3) Three tests were carried out with different combinations of depth and centrifugal acceleration, modeling the same prototype behavior of a 10 m soft layer. The result reconfirmed that modeling of models is held.
4) In order to examine the effect of circumferential strains on the settlement behavior with time, the number of radial slits installed in the drum, dividing the specimens, was changed from 3 to 9. It was found that the number has not a significant influence on the behavior.
5) An attempt was made to do a direct comparison between the test results obtained from beam centrifuge tests and those from drum tests. Appreciably differences were noticed in both settlement-time, and e-log p relationships.
6) An equation of elastic consolidation was derived based and solved. The analytical results were compared with the experimental data, interpreting the test data from the view of the elastic consolidation theory for a uniform layer.
7) Phenomena of self-weight consolidation of multi-layered system were modeled by pouring a clay slurry overlaying another clay slurry being consolidated.

Report

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

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 萩原 敏行 他: "ドラム型自重圧密試験装置の試作" 第25回土質工学研究発表会. 329-330 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 萩原 敏行 他: "小半径のドラム型遠心模型実験装置による学生教育実験 ー粘性土斜面の破壊実験を例としてー" 第18回関東支部技術研究発表会. (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 橋本 則之 他: "小半径のドラム型遠心模型実験装置を用いた自重圧密実験" 第26回土質工学研究発表会. (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T. Hagiwara: "Construction of a Small Drum centrifuge for Self-weight Consolidation" The 25th Japan National Conference on soil mechanics and foundation engineering. 329-330 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T. Hagiwara: "Education Experiment of a Small Drum centiguge" The KANTO Block Conference on JSCE. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] N. Hashimoto: "Self-weight Consolidation tests in a Small Drum Centrifuge" The 26th Japan National Conference on soil mechanics and foundation engineering. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 萩原 敏行他: "ドラム型自重圧密試験装置の試作" 第25回土質工学研究発表会. 329-330 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 萩原 敏行他: "小半径のドラム型遠心模型実験装置による学生実験ー粘性土斜面の破壊実験を例としてー" 第18回関東支部技術研究発表会. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 橋本 則之他: "小半径のドラム型遠心模型実験装置を用いた自重圧密実験" 第26回土質工学研究発表会. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 日下部治: "ドラム型自重圧密試験装置の試作" 第25回土質工学研究発表会. 25. (1990)

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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