NUMERICAL EXPERIMENTS BY DEM ON INTERMIDIATE PRINCIPAL STRESS AFFECTING 3D SHEAR BEHAVIOR

It is important to consider the effect of the intermediate principal stress on 3D shear behavior of granular materials, although there are various factors. The objective is to investigate it macro- and micro-mechanically using dense specimen with spherical particles by Distinct Element Method (DEM). It was found that the relationship between the normalized plastic work and the equivalent plastic deviatoric strain is not strictly unique for different b values, and that the directivity of the contacts with relatively large contact force and the constraint condition due to b value cause the deviation of principal deviatoric strain from the linear relation obtained for isotropic and elastic material, and that numerical experimental results coincide with Lade and Duncan's failure criterion, and that there is a unique relationship among the coordination number, the plastic volume and the equivalent plastic deviatoric strain.