An Anisotropic Damage Model and Its Application for Rock Materials under Impact Load

摘要

In this paper, an anisotropic damage model is established to describe the damage evolution characteristics of remaining rock in geotechnical engineering. A second-order tensor is chosen as the damage variable, starting from it, the expression of damage-dependent elasticity tensor is then deduced and the constitutive equations of damaged rock are built by using an equivalent state. The damage threshold is regularized in order to reflect strain-rate sensitivity of rock materials under impact load. The results of research indicate that damage model can simulate damage characteristics of rock materials under impact load and provide theoretical evidences for stability analysis of rock that has been disturbed by impact load in geotechnical engineering.