Abstract
In this paper, three dimensional discrete element method simulations of true triaxial test are presented. During simulations, the major, the intermediate and the minor principal strains are monitored to maintain the b-value constant. The effect of intermediate principal stress on the frictional parameters of granular materials is studied. Furthermore, the micromechanics of samples using the Stress–Force–Fabric (SFF) relationship is investigated. The SFF relationship is comprised of anisotropy tensors of fabric, contact normal and tangential forces. Results show that, the mobilized friction angles in simulations with different b-values have very good agreements with results of the so-called general stress tensors, which are made of force and position vectors at contact points. It is observed that the evolution of anisotropy in the sample is at the origin of different responses of granular materials in macro scale. The frictional properties of granular materials is observed sensitive to the intermediate principal stress both at macro and grain scale. Our observations highlight the important role of intermediate principal stress, and are consistent with experimental studies of true triaxial tests on granular materials.
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