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2004 Fiscal Year Final Research Report Summary

Development of Element tests for elucidating mechanical behavior of granular materials subjected to cyclic moving loads

Research Project

Project/Area Number 15560420
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Geotechnical engineering
Research InstitutionHOKKAIDO UNIVERSITY

Principal Investigator

ISHIKAWA Tatsuya  Hokkaido Univ., Grad.School of Eng., Asso.Prof., 大学院・工学研究科, 助教授 (60359479)

Co-Investigator(Kenkyū-buntansha) MIURA Seiichi  Hokkaido Univ., Grad.School of Eng., Prof., 大学院・工学研究科, 教授 (00091504)
YOKOHAMA Shoji  Hokkaido Univ., Grad.School of Eng., Inst., 大学院・工学研究科, 助手 (50299731)
SEKINE Etsuo  Railway Technical Research Institute, Laboratory Track Technology Division, Track Structures & Geotechnology Laboratory Head, 軌道技術研究部・軌道路盤研究室, 室長(研究職)
Project Period (FY) 2003 – 2004
KeywordsMoving Load / Granular Materials / Shear Test / Roadbed, Subgrade / Gravel / Cyclic Plasticity / Rotation of Principal Stress Axes / Numerical Analysis
Research Abstract

This study examines the mechanical behavior of granular materials subjected to cyclic moving loads, for example gravel roadbed and railroad ballast, and both a new testing method and new analytical procedures to examine the effects of the rotation of principal stress axes on cyclic plastic deformation of granular materials are proposed. The following conclusions can be obtained ;
1.Cyclic plastic deformation obtained through moving loading tests is much larger than those obtained through fixed-place cyclic loading tests when other experimental conditions are the same. Accordingly, the difference in loading methods has a significant influence on the cyclic plastic deformation of granular materials.
2.Residual strain obtained through cyclic loading triaxial tests with constant amplitude of deviator stress while controlling confining pressure constant is very small compared with the macro residual strain calculated from force-displacement relationships in moving loading tests, while that of … More cyclic torsional simple shear tests using a newly developed "Multi-ring shear apparatus" is almost equivalent to moving loading tests. Therefore, the multi-ring shear test is appropriate for an element test to simulate the actual stress states inside substructures under traffic loads. Moreover, it was revealed that the rotation of principal stress axes has a significant effect on cyclic deformation characteristics of granular materials.
3.Two analytical procedures for simulating the mechanical behavior of granular materials subjected to cyclic moving loads were proposed. One is linear elastic FE analysis considering the material properties of cumulative strain derived from element test results of granular materials, which can roughly estimate the residual settlement of granular substructures due to cyclic loading. The other is discontinuous analysis which elements imitate the shape of real gram particles well because it was revealed that the element shape is one of the dominant factors to determine the mechanical behavior of granular assemblage in discontinuous analysis. Less

  • Research Products

    (8 results)

All 2005 2004

All Journal Article (8 results)

  • [Journal Article] Evaluation of the effect of particle shape on the bearing capacity of railroad ballast with discontinuous analysis2005

    • Author(s)
      石川達也
    • Journal Title

      Proceedings of the 7th International Conference on the Bearing Capacity of Roads, Railways and Airfields

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 多重リングせん断試験機による単粒度砕石の繰返し変形挙動の検討2005

    • Author(s)
      石川達也
    • Journal Title

      地盤工学会北海道支部技術報告集 第45号

      Pages: 105-114

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Evaluation of the effect of particle shape on the bearing capacity of railroad ballast with discontinuous analysis2005

    • Author(s)
      ISHIKAWA, Tatsuya
    • Journal Title

      Proceedings of the 7th International Conference on the Bearing Capacity of Roads, Railways and Airfields

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] An Estimation Method of Residual Settlement in Ballasted Track under Repeated Moving Loads2004

    • Author(s)
      石川達也
    • Journal Title

      Proceedings of CBS04

      Pages: 633-640

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 各種離散化解析手法による模型バラスト軌道の繰返し塑性変形挙動解析2004

    • Author(s)
      石川達也
    • Journal Title

      地盤工学会北海道支部技術報告集 第44号

      Pages: 321-330

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 粗粒材料を対象とした単純せん断試験機の試作と性能評価2004

    • Author(s)
      石川達也
    • Journal Title

      第39回地盤工学研究発表会講演集

      Pages: 863-864

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 道床バラストの繰返し塑性変形に及ぼす移動荷重の影響2004

    • Author(s)
      関根悦夫
    • Journal Title

      鉄道総研報告 18・3

      Pages: 17-22

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] An Estimation Method of Residual Settlement in Ballasted Track under Repeated Moving Loads2004

    • Author(s)
      ISHIKAWA, Tatsuya
    • Journal Title

      Proceedings of CBS04

      Pages: 633-640

    • Description
      「研究成果報告書概要(欧文)」より

URL: 

Published: 2006-07-11  

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