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1992 Fiscal Year Final Research Report Summary

Deformation characteristics of clays at deep position of ground and its time dependency

Research Project

Project/Area Number 03650405
Research Category

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

Allocation TypeSingle-year Grants
Research Field 基礎・土質工学
Research InstitutionOsaka University

Principal Investigator

MATSUI Tamotsu  Osaka University, Faculty of Engineering, Professor, 工学部, 教授 (20029143)

Co-Investigator(Kenkyū-buntansha) ODA Kazuhiro  Osaka University, Faculty of Engineering, Research Associate, 工学部, 助手 (00185597)
Project Period (FY) 1991 – 1992
KeywordsPleistocene deposits / Consolidation Characteristics / Constant rate of strain consolidation test / Shear Characteristics / Undrained strength / Void Index / Simulation analysis / Mechanical parameter
Research Abstract

In this study, the effect of time dependency on the mechanical characteristics of undisturbed clays is investigated, which is in the Pleistocene deposits at the off-Senshu area in Osaka Bay. Also, the method for predicting deformation of the ground is proposed. The main conclusions are summarized as follows:
1. A constant rate of strain consolidation apparatus for semi-high pressure was developed. The consolidation characteristics of undisturbed clays taken from the Pleistocene deposits at the off-Senshu area in Osaka Bay was investigated. Firstly, the effect of such test conditions as strain rate and back pressure on the consolidation characteristics was investigated. It is found that the strain rate significantly affects consolidation yield stresses in the constant rate of strain consolidation tests. Next, a constant rate of strain consolidation apparatus for semi-high pressure could be applicable to the undisturbed clays in the Pleistocene deposits, which have higher yield stresses than the alluvial clays.
2. The undrained shear characteristics of the undisturbed clays in the Pleistocene deposits was investigated through mini-triaxial tests. The undrained shear tests of the reconstituted clays were carried out to investigate the "aging" effect on shear characteristics. The linear relationship between logarithmic maximum deviator stresses and void ratios was observed on both the undisturbed and reconstituted clays. It was shown that the effect of initial void ratio on shear strengths can be excluded through using the void index or the e_L.
3. A method for determining elasto-viscoplastic parameters for the undisturbed clays in the Pleistocene deposits using mini-triaxial tests and consolidation tests was proposed. The reliability of the determined parameters was investigated through the numerical simulation analysis of deformation behavior in triaxial tests and construction of a man-made island.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 松井 保・小田 和広 鍋島 康之・北畠 肇: "中圧ミニ三軸試験による泉州沖洪常粘性土のせん断特性" 平成4年度関西支部年次学術講演会講演概要. 3-8-1-2 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松井 保・小田 和広 鍋島 康之・北畠 肇: "中圧ミニ三軸試験による弾粘塑性パラメータの決定方法" 第27回土質工学研究発表会平成4年度発表講演集. Vol.1. 697-698 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松井 保・小田 和広 鍋島 康之: "再圧密洪積粘土と不撹乱洪積粘土の力学特性" 土木学会第47回年次学術講演会講演概要集. 3. 438-439 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松井 保・阿部 信晴 小田 和広・鍋島 康之: "ミニ3軸試験による弾塑性パラメータの決定と人工島の一次元圧密解析" 第28回土質工学研究発表会平成5年度発表講演集. (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松井 保・阿部 信晴 小田 和広・鍋島 康之: "大阪湾洪積粘土の力学パラメータに関する研究" 平成5年度関西支部年次学術講演会講演概要. (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.MATSUI,K.OSA,Y.NABESHIMA: "Development of Mini-Tnaxial Compression Apparatus" Proc.of 11rh Southeast Asian Geotechnical Conference of S.A.G.S.I.E. (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Matsui, T: "A shear characteristics of undisturbed clays taken from Pleistocene deposits off-Shensu using mini-triaxial test" Proc. of annual meeting of J. S. c. E. in Kansai Chapter. III-8-1-2 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Matsui, T: "Method for determining elasto-viscoplastic parameters using mini-triaxial test" Proc. of annual meeting of J. S. S. M. F. E. 697-698 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Matsui, T: "A mechanical characteristics of both undisturbed and reconstituted clays taken from Pleistocene deposits" Proc. of annual meeting of J. S. C. E. 438-439 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Matsui, T: "Elasto-plastic parameters determined by mini-triaxial tests and one-dimensional consolidation analysis of a man-made island" Proc. of annual meeting of J. S. S. M. F. E. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Matsui, T: "A study of mechanical parameters of undisturbed clays taken from Pleistocene deposits in Osaka Bay" Proc. of annual meeting of J. S. C. E. in Kansai Chapter. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Matsui, T: "Development of Mini-Triaxial Compression Apparatus" Proc. of 11th Southeast Asian Geotechnical Conference of S. A. G. S. I. E. (1993)

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

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Published: 1994-03-24  

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