EFFECTS OF PRINCIPAL STRESS DIRECTION AND INTERMEDIATE PRINCIPAL STRESS ON UNDRAINED SHEAR BEHAVIOR OF SAND

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概要

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• Undrained monotonic loading triaxial compression and extension tests were conducted on Toyoura sand. It was found that the shear behavior was more contractive and softer in triaxial extension than in triaxial compression. This difference suggests that the stress conditions, such as the direction of the principal stress and the magnitude of the intermediate principal stress have some effects on the undrained behavior of sand. To clarify these effects, a series of tests was performed by means of an automated hollow cylindrical torsional shear apparatus. Dry-deposited Toyoura sand was used in these tests. The angle of the maximum principal stress from the vertical to the bedding plane, α, and the intermediate principal stress coefficient, b, were fixed in each test. The intermediate principal stress was fixed to horizontal. For any density, tests with a larger α-value, namely, a larger inclination of σ_1 from the vertical, and a larger intermediate principal stress coefficient b were shown to generate greater excess pore water pressure. In addition, the undrained simple shear behavior of sand under initial isotropic and anisotropic stress conditions was studied. It was made clear that triaxial compression (α=0°, b=0) gives the highest resistance with lowest contractancy, while triaxial extension (α=90°, b=1) gives the opposite extreme in the assessment of flow failure. Simple shear mode of deformation was shown to exhibit an intermediate stress-strain behavior between triaxial compression and extension, which is closer to most of the field conditions.

• 社団法人地盤工学会の論文
• 1998-09-15

著者

• 石原 研而

  Professor of Civil Engineering, University of Tokyo

• 吉嶺 充俊

  Lecturer Department Of Civil Engineering The University Of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-865

• Yoshimine Mitsutoshi

  Department Of Civil Engineering The University Of Tokyo

• 石原 研而

  Professor Department Of Civil Engineering Science University Of Tokyo.

• Yoshimine M

  Department Of Civil Engineering The University Of Tokyo

• VARGAS WILLIAM

  Department of Civil Engineering

関連論文

• 地震時の液状化に伴う砂地盤の沈下量予測(『土質工学会論文報告集』Vol.32,No.1 (1992年3月発行)掲載論文の概要)
• LIQUEFACTION-INDUCED COMPACTION AND SETTLEMENT OF SAND DURING EARTHQUAKES
• SUBSIDENCE OF BUILDING FOUNDATION RESTING UPON LIQUEFIED SUBSOIL : CASE STUDIES AND ASSESSMENT
• 液状化時の砂の流動ポテンシャル(『地盤工学会論文報告集』Vol.38,No.3 (1998年9月発行)掲載論文の概要)
• 主応力の方向と中間主応力の大きさが砂の非排水せん断挙動に与える影響(『地盤工学会論文報告集』Vol.38,No.3 (1998年9月発行)掲載論文の概要)
• FLOW POTENTIAL OF SAND DURING LIQUEFACTION
• EFFECTS OF PRINCIPAL STRESS DIRECTION AND INTERMEDIATE PRINCIPAL STRESS ON UNDRAINED SHEAR BEHAVIOR OF SAND
• FLOW POTENTIAL OF SANDY SOILS WITH DIFFERENT GRAIN COMPOSITIONS
• EMPIRICAL CORRELATION BETWEEN SPT N-VALUE AND RELATIVE DENSITY FOR SANDY SOILS
• MODELLING OF SAND BEHAVIOUR BASED ON STATE CONCEPT
• NORMALIZED BEHAVIOR OF VERY LOOSE NON-PLASTIC SOILS : EFFECTS OF FABRIC
• PORE WATER PRESSURES AND GROUND MOTIONS MONITORED DURING THE 1985 CHIBA-IBARAGI EARTHQUAKE
• UNDRAINED PLANE STRAIN SHEAR TESTS ON SATURATED SAND USING A HOLLOW CYLINDER TORSIONAL SHEAR APPARATUS
• GENERALIZED COULOMB'S CRITERION FOR 3-DIMENSIONAL STRESS CONDITIONS

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