Internal friction and void ratio will change among granular particles under vibration,and the size of void ratio directly affects strength of granular media.To further study the effect of vibration parameters on granular mechanical properties,discrete element method is used to simulate particles motion in a vibrating rectangular case by PFC2D software and study the influence of vibration frequency and amplitude on void ratio of particles under cyclic loading.The results show that void ratio and axial stress of particles,which are with the same change trend,decrease with increasing vibration time,and the change process above is consistent with vibration compaction theory of internal friction decreasing doctrine.
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