• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Development of shear device for large deformation of sand

Research Project

Project/Area Number 07555444
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section試験
Research Field Geotechnical engineering
Research InstitutionUniversity of Tokyo

Principal Investigator

TOWHATA Ikuo  University of Tokyo, Department of Civil Engineering, Professor, 大学院・工学系研究科, 教授 (20155500)

Co-Investigator(Kenkyū-buntansha) YOSHIMINE Mitsytoshi  University of Tokyo, Department of Civil Engineering, Assistant, 大学院・工学系研究科, 助手 (80251338)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1996: ¥2,300,000 (Direct Cost: ¥2,300,000)
Keywordsshear / sand / shear band / microscope / dilatancy / large deformation / 微視的観察 / 定常状態
Research Abstract

A new shear device for sand was developed which can study the granular movement of sand particles prior to and after the peak strength and during the state of residual strength.
The shear device houses a specimen which measure 5^<**>5^<**>10cm^3in size. A vacuum pressure is introduced into the specimen in order to produce an effective confining pressure. This measure makes pressure cell unnecessary and enables a microscope to directly approach the specimen. The microscopic observation of granular movement is made further easier by covering one of the side faces of the specimen with a transparent acryl plate. The microscope employed in the present study has CCD transducers of digital type which make it possible to analyze the observed data by a computer.
The present research revealed the following issues. Firstly, granular movement prior to the peak strength consists of falling of grains into adjacent large voids. This phenomenon occurs more or less uniformly in the specimen. In contrast, after the peak strength, shear movement of grains is concentrated in a narrow domain which is often called a shear band. The width of the shear band is approximately 10 times the grain's diameter. Both shear and rotational movements are significant in the shear band. In particular, the rotational movement was found to be irregular, occurring in both positive and negative directions. The dilatant motion was also found more important in the shear band than outside of it.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] K.Furumoto.I.Touhata and A.Yoshida: "Microscopic Observation of Shear Band in Plane Strain Compression Test of Sands" International Symposium on Deformation and Progressive Failure in Geomechanics.(未定). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 古本 一司, 東畑 郁生: "一軸圧縮試験におけるせん断層の微視的観察" 第31回地盤工学研究発表会. 813-814 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Furumoto, I.Towhata, and A.Yoshida: ""Microscopic Observation of Shear Band in Plane Strain Compression Test of Sands"" International Symposium on Deformation and Progressive Failure in Geomechanics. (submitted to). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Furumoto, I.Towhata: ""Microscopic observation of shear band in unconfined compression test"" The thirty-first Japan National Conference on Geotechnical Engineering. 813-814 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.Furumoto,I.Towhata and A.Yoshida: "Microscopic Observation of Shear Band in Plane Strain Compression Test of Sands" Int.Sympsm.on Deformation and Progressive Failure in Geomechanics. (未定). (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] 東畑郁生,W. Vargas, 桃谷尚嗣: "地盤流動にともなう大変形の可能なせん断試験装置の開発" 地盤工学会論文集. (発表予定). (1996)

    • Related Report
      1995 Annual Research Report

URL: 

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

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi