Numerical tests on heterogeneous effect in damage and acoustic emission characteristic of rocks under uniaxial loading

Abstract

To investigate the influence of rock heterogeneity on mechanical properties, RFPA2D used for analysis of rock failure process was applied to study the damage evolution mode and acoustic emission characteristic of rocks with various kinds of heterogeneity. The results show that rock heterogeneity has remarkable influence on its mechanical properties. As the rock heterogeneity increases, the damage evolution mode of rock changes from ductile failure into brittle failure, and the dispersivity of macroscopic unstable failure decreases. At the same time, peak strength of rocks increases continuously, and finally reaches to a stable value. It is also found that when the rock heterogeneity is low, acoustic emission of rocks under uniaxial loading reflects a property of low intensity and high frequency. Acoustic emission strength and mutagenicity of rocks increase with higher rock heterogeneity