Study on the Mechanical Property and Failure Model of the Granite Rock under Dynamic Loadings

摘要

The paper used the numerical software of RFPA~(2D)-Dynamic to build the numerical simulation model of the Brazilian disk and study the initiation, propagation, coalescence of the crack and eventually fail through setting different compression stress waves, and analyzed the failure mechanism and process of the rock. The results showed: (1) With the increase of the stress rate, the tensile strengthen of the rock also increases and has a logarithmic growth. (2) Under the higher stress rate, the time of the damage, crack initiation, and coalescence are in advance comparatively. At the same loading time, the damage and failure scale are more obvious. (3) The failure model of the Brazilian disc is splitting along loading path and appears "V-shaped" failure zone at the contact area.