According to dynamic triaxial test of the filter material

the 2D particle flow code approach of discrete element method is applied to generate numerical sample to simulate the dynamic shear modulus and damping ratio test

and the undrained condition is performed by maintaining the volume unchanged.The suitable behavior is obtained by adjusting micro-contact parameters and comparing with the real test result.The micro analysis of dynamic triaxial test is exerted by monitoring coordinate number

porosity and excess pore water pressure during the test.After discussing the effects of consolidation ratios and compactness on maximal modulus

it is confirmed that the effects of consolidation ratios of filter material on maximal shear modulus conform the results of Hardin formula.According to comparison between test and simulation

it is found that the numerical simulation of dynamic shear modulus and damping ratio test on filter material by particle flow code is feasible

and the law of micro behavior conforms with the laboratory test.