Abstract
Discrete element model (DEM) is implemented for the numerical simulation of direct shear test on the elliptical-shaped particle assemblies. The effect of initial elongation of particles on the macro-micromechanical behavior is investigated Particles in the assemblies were generated under three initial orientations: random, perpendicular and parallel to the shear direction. Assemblies, also consist of approximately 1000 particles. The results indicate that initial particles orientation has significant influences on the response of assemblies undergone shear deformation. Evolution of fabric anisotropy, contact normal force, contact shear force and their directions during shear deformation are noticeable. For specimen with vertically oriented particles, the coordination number is smaller than the two others, but it shows the highest shear strength. This happens because the magnitude of anisotropies in assembly with vertical bedding angle is greater than the two others. From the macro stand point, the results indicate that the initial orientation of particles has noteworthy effect on the volumetric strain and shear resistance of assemblies during shear deformation.
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