ELASTIC DEFORMATION PROPERTIES OF GEOMATERIALS

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概要

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• The stress-strain relationships of various kinds of geomaterials; i.e., a cement-treated sandy soil, a sedimentary soft rock, gravels, sands and reconstituted kaolin, were examined in tests using specimens subjected to both monotonic and cyclic shear in triaxial, plane strain compression and torsional simple shear. A particular attention was paid on their stiffness at small strains, for which the deformation of specimens in triaxial and plane strain compression was measured locally over the central part with an accuracy of the strain measurement of about 0.0001%. In a series of tests performed on normally consolidated specimens, the elastic shear modulus, G_<max>, was defined for small strain ranges having their limits with the order of 0.001%, below which the response was found to be practically linear elastic. The G_<max>-value was hardly influenced by the rate of shearing and the type of loadings (i.e., static monotonic, static cyclic and dynamic loadings) within the small strain range. It was also demonstrated that the G_<max>-value of sands was scarcely affected by the stress and strain histories as examined in tests using specimens subjected to different degrees of initial shear applied during consolidation and of over-consolidation, and to cyclic prestraining at relatively large strain levels. The results suggest that, with a supply of high-quality undisturbed samples, the G_<max>-value, together with the strain level-dependent stiffness and the strength, of natural ground can be evaluated by having the results of laboratory monotonic loading tests with necessary corrections for the effects of sample disturbance. Also, the elastic shear modulus from in-situ elastic shear wave velocity can be directly used for the analyses of monotonic and cyclic problems as the effects of some factors, such as the strain level-dependency of the stiffness, are properly evaluated.

• 社団法人地盤工学会の論文
• 1992-09-15

著者

• 澁谷 啓

  アジア工科大学院

• 龍岡 文夫

  IIS, University of Tokyo

• Park C‐s

  Ocean Resources Research Institute Dong-a University

• Kong X

  中国大連理工大学

• 澁谷 啓

  Hokkaido University

• TEACHAVORASINSKUN SUPOT

  IIS, University of Tokyo

• KONG XIAN

  Dailian University of Technology, China

• 安倍 文洋

  Tokyo Metropolitan Government

• KIM YOUSEONG

  IIS, University of Tokyo

• PARK CHOONSIK

  IIS, University of Tokyo

• Kong Xian

  Dailian University Of Technology China:iis

• Kim Y

  Iis University Of Tokyo

• 安倍 文洋

  Tokyo Metropolitan Government:formerly Graduate Student Iis University Of Tokyo

• Teachavorasinskun S

  大成建設 技研

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• 広い範囲のひずみにおける土供試体の測方ひずみの直接測定の有用性について(『土質工学会論文報告集』Vol.34,No.2(1994年6月発行)掲載論文の概要)
• ASTM動的土質試験法に関するシンポジウムIIに参加して
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• QUALITY OF THE LUBRICATION LAYER USED IN ELEMENT TESTS ON GRANULAR MATERIALS
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• ELASTIC DEFORMATION PROPERTIES OF GEOMATERIALS
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• 室内試験法(土質工学40年の歩み)
• Richard Jardine博士の講演会報告
• SHEAR MODULUS AND CYCLIC UNDRAINED BEHAVIOR OF SANDS
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• 原位置調査・室内試験・逆解析による土と岩の変形係数-2-弾性的性質と測定誤差

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