Numerical simulation of 3D semi-real-shaped granular particle assembly

Recent researches have proved that the shape of particles has significant effect on the mechanical behavior of granular materials. Therefore to model the appropriate behavior of granular assemblies, it's very ideal that they become simulated as accurate as possible. The method that is applied in this paper simulates grain shapes close to reality. In this way, shape of a particle is modeled by combining a set of overlapping spheres, which are connected to each other in a rigid way. A program that is based on Discrete Element Method (DEM) has been developed to generate different real grain shapes. In order to investigate the influence of grain shape on mechanical behavior of granular soil, four groups of grains with different angularities, including high angular, medium angular, round, and spherical, are generated. Several triaxial tests with different confining pressures and friction coefficients have been carried out on assemblies with different grain shapes. The results prove that angularity of grains considerably affects the behavior of granular material.

Different granular particles are modeled by combining a set of overlapping spheres, which are connected to each other in a rigid way. In order to compare the effect of grain shape on mechanical behavior of granular soil, four groups of grain with different angularities are modeled and several triaxial tests are done. The result proves this fact that angularity of grains considerably affects the behavior of soil.Figure optionsDownload as PowerPoint slideHighlights
► Different granular particles are modeled by combining a set of overlapping spheres.
► Four groups of grain with different angularities are modeled.
► Several triaxial tests are done to compare the effect of grain shape.
► The result proves that angularity of grains considerably affects the behavior of soil.