Research status and Prospect of initial damage of rock mass in laboratory

Rock has experienced hundreds of millions of years of geological activities, and there must be defects of multi genesis, multi type and multi-scale, which often become the core factor limiting the function and safety of rock. In this paper, the initial damage of rock mass is taken as the research object. Based on the literature research, the development process of initial damage of rock mass in the laboratory is summarized. The scale classification, fracture preparation method and fracture observation method of initial damage are described respectively. On this basis, this paper analyzes the problems encountered in the current research of initial damage means, points out the key areas that should be paid attention to in the future, and lays a foundation for the further development of rock mechanics.