Preliminary Study on Microscopic Mechanism of Stress-Induced Anisotropy for Coarse-Grained Soil

To study the microscopic mechanism of stress-induced anisotropy for coarse-grained soil, with PFC(particle flow code) numerical simulation method, many planar biaxial test samples composed of regular disk particles or irregular clump particles were prepared, different initial stress states were given, and equal stress increment was applied on different directions. Then, initial elastic modulus and stress-induced anisotropy property were got, and analysis of its microscopic mechanism of stress-induced anisotropy was given. Results shows, the stress-induced anisotropy of coarse-grained soil occurs under the interaction of internal irregular microscopic structure and external non-isotropic stress.