Microscopic study on stress-strain relation of granular materials
基于细观结构的颗粒介质应力应变关系研究

A biaxial compression test on granular materials is numerically simulated by discrete element method(DEM).The evolution of the microstructures of granular materials during isotropic compression and shearing is investigated,on which a yield function is derived.The new yield function is similar to the modified Cam-clay model and explains the yield behaviors of granular materials under isotropic compression and shearing by the distribution of the contact angles of particles.