The performance of gravel layer in highways is influenced by the properties of the gravel particles.The particle shape is a key characteristic affecting the bearing capacity of the gravel layer,represented by angularity and sphericity indices.The impact of particle angularity and sphericity on the macroscopic and microscopic mechanical properties of gravel soil was investigated through discrete element simulation employing the overlapping rigid clusters method.Numerical models of triaxial tests for gravel soil with different particle shapes under the same porosity conditions were established,and the evolution of internal friction angle,volumetric strain,mechanical coordination number,structure,and contact force chain was explored.The results indicate that the internal friction angle increases with the increase of angularity index(AI)and decreases with the increase of sphericity index(SPH).Under large strains,the shear dilation ratio significantly increases with increasing AI,while it initially increases and then decreases with the increase of SPH.On a microscopic scale,the mechanical coordination number increases with AI and decreases with SPH.The deviatoric fabric increase with the increase of AI and the decrease with SPH.Particle shape influences the distribution of microscopic contact force chains,thereby affecting the macroscopic shear strength.
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维普
