(1. School of Resources and Safety Engineering,Central South University,Changsha,Hunan 410083,China;
2. Hunan Provincial Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines,Central South University,Changsha,Hunan 410083,China)
Abstract:Deep mining is an inevitable way for the future development of hard rock mines. Rockburst disaster in deep mining is one of the key scientific problems that must be solved in the future development of hard rock mines. Since clearly interpreting the rockburst mechanism is being a worldwide scientific difficulty,it is necessary to conduct accurate and reliable analyses of the energy storage ability of deep surrounding rock,the high stress environment and the whole path of excavation stress state. It was fonud that rockburst essentially belongs to the coupled static-dynamic loading problem of hard rock medium subjected to "static stress + dynamic disturbance". According to this idea and on the basis of extensive collection of typical rockburst cases all over the world,some necessary conditions for rockburst,i.e. intact elastic-brittle rock mass,high geostress and dynamic disturbance,were analyzed,and the coupled static-dynamic loading mechanical mechanism of rockburst and its recent research progress were systematically summarized. Especially,by using hard rock material,the mechanical mechanism of rockburst was studied from two aspects of "static stress + unloading disturbance" and "static stress + loading disturbance" on one hand,and on the other hand,considering the spatial structure effect of deep excavation,the failure characteristics of strain rockburst in surrounding rock of deep circular cavern wall were investigated from two aspects of "static stress + stress adjustment" and "static stress + dynamic disturbance". The different types of coupled static-dynamic loading mechanism of rockburst were further clarified. In addition,a dynamic criterion referring to dynamic-static energy indices for rockburst occurrence and the methods for controlling rockburst occurrence in deep hard rock mining were proposed. The combined effects of coupled static and dynamic loading/unloading for inducing rockburst can provide a new idea and method for explaining rockburst mechanism.
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