中主应力对散粒体材料强度和变形影响的数值模拟研究

doi:10.13722/j.cnki.jrme.2013.1523

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Abstract Using PFC3D，the influence of intermediate principal stress on strength and deformation of granular materials was studied and microcosmic mechanism was probed using statistical method. Simulating results show that shearing resistance angle，axial peak stress and the corresponding axial strain firstly increase and subsequently decrease with the increase of intermediate principal stress ratio b. The strain in the intermediate principal stress direction is tensile train and becomes compressive strain with the increase of b，while volumetric strain transitions from shear contraction to shear dilatancy. Simulating results agree very well with Lade-Duncan criterion. In microscopic level，b affects the distribution of contact forces. As b increases，the increase effects in intermediate principal direction are more prominent for lower b values and strength has an initial increase. When b approaches 1，the decrease effects in minor principal direction are more prominent and lead to a lower strength.

Key words： numerical simulation granular material true triaxial test intermediate principal stress discrete element

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2013.1523 OR http://www.rockmech.org/EN/Y2015/V34/Is1/3389

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