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Study on undrained and residual strength of clay soils having no true cohesion

Research Project

Project/Area Number 08455222
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

YAGI Norio  Ehime University, Faculty of Engineering, Professor, 工学部, 教授 (00027228)

Co-Investigator(Kenkyū-buntansha) YOKOTA Kinutada  Ehime University, Faculty of Engineering, Research Associate, 工学部, 助手 (30036363)
YATABE Ryuichi  Ehime University, Faculty of Engineering, Professor, 工学部, 教授 (70127918)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 1997: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1996: ¥3,800,000 (Direct Cost: ¥3,800,000)
Keywordsclay soil / undrained strength / residual strength / angle of shearing resistance / triaxial compression test / ring shear test / clay mineral / 有効応力 / 間隙水圧係数
Research Abstract

There exist many clay soils which have no true cohesion in Japan.Shear strength of such a clay soil can be determined by the angle of shear resistance phi' and pore water pressure generated during shear, that is, the coefficient of pore water pressure A_f at failure. We carried out the triaxial compression and the ring shear tests for many clay soils sampled from landslide sites and the seabeds. Also we conducted mineral analyzes to investigate influence of clay minerals on the strength parameter. Conclusions are as follows.
1.The clay soil which has no true cohesion has an unique angle of shearing resistance phi' regardless of states of clay soil.
2.A clay which has lower water soil than so called normally consolidated clay soil can obtained by remolding and reconsolidating soil. Such a clay soil is also normally consolidated state. A_f of this clay soil increases with consolidation pressure, though it is constant for the so called normally consolidation state. The angle of shear resistance phi' from the plain strain test is not always bigger than one from the triaxil test.
3.The angles shear resistance phi' and phir corresponding to the residual strength become small if the clay soil contains clay minerals such as expansive chlorite, talc and montmorillonite. It is problem that difference between phi' and phi_r becomes big. This difference is also big when minerals mentioned above is containe.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] Yagi, Yatabe, Mukaitani: "UNDRAINED SHEAR STRENGTH OF CLAYEY SOIL UNDER VARIOUS STRESS AND STATE CONDITIONS" PROC.OF SECOND INT.CONF.ON SOFT SOIL ENGINEERING. VOL.1. 169-174 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 矢田部、八木、向谷、榎: "土の残留強度に及ぼす試験法とすべり面拘束条件の影響" 土木学会論文集. No.554 III-37. 139-146 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 八木、矢田部、向谷: "有効応力による粘性土の強度特性について" 土木学会論文集. No.575 III-40. 1-8 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Yatabe, Yagi, Yokota: "Mineralogical and soil mechanical characteristics of landslide at serpentine belt" Proc.of Int.Symp.Engineering Geolory and Environment. Vol.1. 1149-1153 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 矢田部、横田、八木、野地: "蛇紋岩地すべりの発生機構に対する検討" 地すべり. 第34巻 第1号. 24-30 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 八木、矢田部、横田、松村: "残留強度を用いた地すべり斜面の安定解析事例" 第2回環境地盤工学シンポジウム発表論文集. 24-30 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Yagi, Yatabe & Mukaitani: "UNDRAINED SHEAR STRENGTH OF CLAYEY SOIL UNDER VARIOS STRESS AND STATE CONDITIONS" PROC.OF SECOND INT.CONF ON SOFT SOIL ENGINEERING. VOL.1. 169-174 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Yatabe, Yagi, Mukaitani & Enoki: "INFLUENCE OF SHEAR TEST METHOD AND RESTRAINT CONDITION ON RESIDUAL STRENGTH OF SOIL" JOUNAL OF GEOTECHNICAL ENGINEERING,JSCE. NO.554. 139-146 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Yatabe, Yagi & Yokota: "Mineralogical and soil mechanical Characteristics of landslide at serpentine belt" Proc.Ofint.Symp.Engineering Geology and Environment. Vol.1. 1149-1153 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Yatabe, Yokota, Yagi & Noji: "Consideration on the Mechanism of Landslides at Serpentine Belt" Journal of Japan Landslide Society. Vol.34 No.1. 24-30 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Yagi, Yatabe & Mukaitani: "EXPERIMENAL CONSIDERATION ON STRENGTH PARAMETERS IN TERMS OF EFFECTIVE STRESS OF CLAY" JOURNAL OF GEOTECHNICAL ENGINEERING,JSCE. No.575. 1-8 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Yagi, Yatabe, Yokota & Matsumura: "Consideration on the Stability of Slope in the Designated Landslide-threatened Area usin Residual Strength" Proc.Of the Second Japan National Symp. on Environmental Geotechnology. 169-172 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Yatabe, Yagi, Yokota: "Mineralogical and soil mechanical characteristics of landslide at serpentine belt" Proc.of Int.Symp.Engineering Geolory and Envirinment. Vol.1. 1149-1153 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 矢田部、横田、八木、野地: "蛇紋岩地すべりの発生機構に対する検討" 地すべり. 第34巻第1号. 24-30 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 八木、矢田部、向谷: "有効応力による粘性土の強度特性について" 土木学会論文集. No.575 III-40. 1-8 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 八木、矢田部、横田、松村: "残留強度を用いた地すべり斜面の安定解析事例" 第2回環境地盤工学シンポジウム発表論文集. 169-172 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 矢田部龍一・八木則男 向谷光彦・榎明潔: "土の残留強度に与える試験法ならびにすべり面の拘束条件の影響" 土木学会論文集. No.554 III-37. 139-146 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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