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Estimation method for pore water pressure under shearing deformation

Research Project

Project/Area Number 62550364
Research Category

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

Allocation TypeSingle-year Grants
Research Field 基礎・土質工学
Research InstitutionHakodate National College of Technology

Principal Investigator

SANO Yoshifusa  Hakodate National College of Technology, Associate Professor, 土木工学科, 助教授 (90041897)

Project Period (FY) 1987 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1989: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1988: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1987: ¥800,000 (Direct Cost: ¥800,000)
KeywordsTriaxial Compression Test / Clay / Pore Water Pressure / Plastic Pore Water Pressure / Consolidated and Undrained Shear / vertical axial strain
Research Abstract

Many behaviors in subsoil can be explained by effective stress, but not by total stress. Effective stress is conceptual value, which is assumed to be acted on soil skeletons. The stress is not directly measured, but estimated in calculation of total stress minus pore pressure. In practical problems, total stress is easily estimated, while no ways for estimation of pore pressure under shear are established. Pore pressure induced in shear can be divided into elastic and plastic components. As plastic pore pressure is irrecoverable, it must be deeply concerned with axial strain. To clear it in experiments, some undrained triaxial test according with some sorts of total stress path have been carried out.Excess pore pressure heavily depends on total stress path, but using plastic pore pressure can weaken those effects. However, its accuracy is insufficient,and isotropy in a specimen is questionable.Elastic pore pressure is assumed to be equal to increase in mean principal stress.
Although triaxial test is called an element test, ends of a specimen are prevented from free deformation because of friction and restriction.On the other hand, center portion of the specimen is considered to be free from restriction. Therefore, pore pressure is to be unequal in a specimen,whereas pore pressure is generally measured at end of a specimen from the technical view point. So, resultant value is obtained of pore pressures at center and end. A miniature pore pressuremeter is put at midheight of a specimen to measure pore pressure at center. Two pore pressures at mid-height and at end are nearly equal in slow tests but not in quick tests. Even in slow tests,adequate pore pressure in shear zone is not obtained if the meter is outside from failure zone in case with distinct shear failure. Specimens must be in uniform deformation as element tests.

Report

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

    (15 results)

All Other

All Publications (15 results)

  • [Publications] 佐野佶房,岩渕祐一: "正規圧密粘土の塑性間隙水圧と鉛直軸ひずみの関係" 土質工学会北海道支部技術報告集. 第28号. 55-60 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 佐野佶房,岩渕祐一: "真の三軸試験における塑性間隙水圧と鉛直軸ひずみの関係" 第23回土質工学研究発表会. 535-536 (1988)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 佐野佶房,岩渕祐一: "カオリン粘土における塑性間隙水圧と鉛直軸ひずみの関係" 土質工学会北海道支部技術報告集. 第29号. 119-124 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 佐野佶房,岩渕祐一: "低塑性粘土供試体中央位と底面における間隙水圧の比較" 第24回土質工学研究発表会. 613-614 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 佐野佶房,岩渕祐一: "人工再圧密試料のせん断特性に及ぼす簡易な保存法の影響" 土質工学会北海道支部技術報告集. 第30号. 223-228 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] SANO, Y. & IWABUCHI, Y.: ""The relationship between plastic pore water pressure and vertical axial strain of a normally consolidated clay,"" Technical Report, Hokkaido Branch of JSSMFE, No.28, pp55-60, 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] SANO, Y. & IWABUCHI, Y.: ""Comparison on pore water pressure between at midheight and at base of a clayey specimen with low plasticity,"" Proc. of 23rd Japan National Conf. on SMFE, pp535-536 1988.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] SANO, Y. & IWABUCHI, Y.: ""Effect of a simplified storage method on shearing characteristics in reconstituted samples,"" Technical Report, Hokkaido Branch of JSSMFE, No.29, pp119-124 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] SANO, Y. & IWABUCHI, Y.: ""The relationship between plastic pore water pressure and vertical axial strain in true triaxial tests,"" Proc. of 24th Japan National Conf. on SMFE, pp613-614 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] SANO, Y. & IWABUCHI, Y.: ""Relationships between plastic pore water pressure and vertical axial strain in remoulded Kaolin clay,"" Technical Report, Hokkaido Branch of JSSMFE, No.30, pp223-228 1990.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 佐野佶房・岩渕祐一: "人工再圧密試料のせん断特性に及ぼす簡易な保存法の影響" 土質工学会北海道支部技術報告集. 第30号. 223-228 (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 佐野佶房・岩渕祐一: 土質工学会北海道支部技術報告集. 第29号. 119-124 (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 佐野佶房・岩渕祐一: 第24回土質工学研究発表会発表講演集. (1989)

    • Related Report
      1988 Annual Research Report
  • [Publications] 佐野 佶房: 土質工学会北海道支部技術報告集. 28. 55-60 (1988)

    • Related Report
      1987 Final Research Report Summary
  • [Publications] 佐野 佶房: 第23回土質工学研究発表会発表講演集. (1988)

    • Related Report
      1987 Final Research Report Summary

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

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