Studies on prevention and control of rock burst disaster in deep well hard rock mine

In order to prevent and control rock bursts caused by the mining of the Dongguashang Mine, the systematical studies on prevention and control of rock burst disaster in deep well hard rock mine are done with a synthetical research method joining laboratory experiments, numerical calculations and situ rock burst researches together. From the mechanics experiments of rocks, the rock burst proneness of the rocks is determined by the synthetical index of judging rock burst proneness, and it is pointed out that rock burst proneness has two types of properties, that is, fountain and inductive. From the electron scanning microscope testes, experiments of physical model and situ rock burst researches, it is found that rock burst is caused by tensile break, and has obvious abnormality premonitions in break of rock and engineering construction. The results of the situ rock bursts and numerical calculations show that the rock burst dangerous districts are of stress concentrating, energy storing largely and having ability and conditions of releasing quickly. The stope structure parameters and mining steps of the mine are optimized with numerical simulation method based on energy release rates in order to prevent rock bursts of stope. From the four aspects of reducing energy storage, controlling energy release,using flexible supports and establishing rock burst monitoring system, the specific measures of prevention and control of rock bursts are obtained. 3figs. ,2tab. ,11refs.