Energy Dissipation Method for Surrounding Rock's Stability Analysis and Its Application

Abstract

Traditional single stress or strain failure criterion cannot fully consider the rock property of brittle-ductile transition, elasto-plastic finite element method is difficult to simulate the softening and instability of surrounding rock with low confining pressure, and reinforcement mechanism under complex stress state needs to be further studied for surrounding rock. From the energy storage and dissipation process of surrounding rock-support system, by establishing energy dissipation method (EDM) for surrounding rock's stability analysis and the energy supply theory of supporting structure, energy dissipation ratio criterion for surrounding rock's failure is proposed, and EDM calculation process for surrounding rock's stability analysis is given. With the analysis of surrounding rock's state and failure for Jinping I underground powerhouse, this paper particularly studies and compares the distribution rule of principal stress, total resistant energy and energy dissipation zone before and after reinforcement of surrounding rock. As a result, the deformation failure and supporting mechanism is expounded for surrounding rock, as well as verifying the feasibility of EDM.