Simulation on Effect of Initial Stress Condition on Dynamic Deformation Characteristics of Coarse Materials

The soil is usually under complex initial stress before being subjected to earthquake and wave loading. The conventional triaxial test cannot simulate the dynamic behavior of soils under complex consolidation stress states. The true cyclic triaxial tests of coarse materials are studied by using partial flow code under three-directional anisotropic consolidation. The effects of initial intermediate principal stress coefficient on dynamic deformation characteristics of coarse materials are investigated systematically based on PFC3D. The results show the initial intermediate principal stress coefficient has little influence on shear modulus and damping ratio. The normalized shear modulus and damping ratio vs. normalized shear strain are located in a narrow space, respectively. The maximum absolute axial deformations are not always in the loading direction, which is determined by the initial stress state.