Rockburst Prediction of Deep Mining in Tectonic Stress Mine

As more than 40 years' mining in Chengchao Iron Mine, the excavation depth now is arriving at -600m level, and rockburst is becoming one of the main safety problems during the deep mining in the tectonic stress mine, so as to predict the possibility and intensity, rock specimens from the depth of -430 meters to -700 meters are obtained for systematical rocks mechanics testing. Based on various prediction criteria, the different intensity of the wall rock for rockburst are ascertained. Combined with the measured in-situ stresses, the model of the in-situ stresses field is established, and elastic strain energy of wall rock is confirmed by the strain numerical simulation, judging by the engineering research and site monitoring, the critical mining depth for rockburst is obtained. At last, according to the above analysis, the possibility of rockburst during deep mining and its potential depth in Chengchao Iron mine is predicted.