Abstract：In order to study shear behavior of soil-rock mixture, biaxial models of soil-rock mixture are established by PFC2 Dbased on discrete element method theory to analyz shear behavior of soil-rock mixture with different conditions of load and rock content, and Fourier series is introduced to study distribution law of fabric in strong and weak force chains. The results show that the shear strength and dilatancy behavior of soil-rock mixture increase with the increase of rock content, strong force chains play a vital role to bear axial load, finally frictional angle values of soil-rock mixture with different rock content are confirmed by a series of biaxial test.

Keyword：soil-rock mixture;discrete element method;biaxial test;rock content;Fourier series;