NON-COAXIALITY AND ENERGY DISSIPATION IN GRANULAR MATERIALS

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概要

• 論文の詳細を見る

• The paper presents a theoretical and experimental study of the effects of non-coaxiality or non-coincidence of the principal stress and the principal plastic strain increment directions on the behaviour of granular materials. Experimental results from hollow cylindrical tests on sand involving principal stress rotation which support previously published results on non-coaxiality are presented. These results imply that constitutive relations cannot be sufficiently formulated in the principal stress space unless the deviations between the principal stress and plastic strain increment directions are taken into consideration. It is shown that plasticity formulations with plastic potentials that are scalar functions of the stress invariants alone implicitly assume coaxiality and cannot be used for loading involving principal stress rotation. The paper presents a comprehensive analysis of the effects of non-coaxiality on the energy dissipation of sand. The paper shows that energy dissipation calculated from the principal stresses and the principal plastic strain increments or from the stress and plastic strain increment invariants, would be erroneous and would over-estimate the amount of dissipated energy during loading in the case of non-coaxial flow. A non-coaxiality factor is introduced in order to account for the effects of non-coaxiality on the energy dissipation equation and in a stress-dilatancy relation for granular materials. Explicit expressions of the non-coaxiality factor for two-and three-dimensional loading conditions are given at the end of the paper. Experimental results are presented to show the validity of the proposed energy dissipation and stress-dilatancy equations.

• 社団法人地盤工学会の論文
• 2000-04-15

著者

• 石原 研而

  Science University Of Tokyo Chiba 278-8510.

• Gutierrez M

  Norwegian Geotechnical Institute (ngi) Oslo Norway.

• GUTIERREZ MARTE

  Norwegian Geotechnical Institute (NGI), Oslo, Norway.

関連論文

• THE STEADY STATE OF SANDY SOILS
• NON-COAXIALITY AND ENERGY DISSIPATION IN GRANULAR MATERIALS
• 主応力方向回転時の砂の変形モデル(『土質工学会論文報告集』Vol.33,No.3 (1993年9月発行)掲載論文の概要)
• YIELDING AND FLOW OF SAND UNDER PRINCIPAL STRESS AXES ROTATION
• MODEL FOR THE DEFORMATION OF SAND DURING ROTATION OF PRINCIPAL STRESS DIRECTIONS
• 主応力回転時の砂の流れ則(『土質工学会論文報告集』Vol.31,No.4 (1991年12月発行)掲載論文の概要)
• FLOW THEORY FOR SAND DURING ROTATION OF PRINCIPAL STRESS DIRECTION

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