Mechanism and Predicting Theory-Based of Rockburst Evolution

Abstract

Mechanism and predicting of rockburst is complicated, and there is no mechanism and prediction model to explain the occurrence of rockburst satisfactorily. In this chapter, the mechanism of rockburst stress-energy evolution is obtained by analyzing the pre-peak stage of rock compressive deformation. Rockburst is mainly caused by the accumulation of stress and the accumulation and release of elastic strain. The change of stress for rockburst occurred plays a leading role, It not only leads to the accumulation and release of elastic strain energy, but also the damage cracking unit of rock structure. Thereby, reducing the energy storage capacity of rock elastic strain energy. In addition, the elastic strain energy released by rockburst is the result of accumulation and dissipation of elastic strain energy. Based on the analyse, the stress-energy evolution of rockburst was proposed. The nonlinear dynamic theories of predicting rockburst were introduced, such as mutation, damage, load/unload response ratio, entropy, fuzzy matter element and Bayesian theory. New predicting models and methods were established based on these theories.