Abstract: The underground pressure hazard in the mining of thick and large ore-body by using panel insulating pillar at Dongguashan copper was analyzed by numerical simulation and microseismic monitoring. Results reveal that rock burst in the mining process is unlikely to occur with very low probability. The volume of each excavation unit should be controlled because displacement and plastic zone increase obviously due to degraded technical condition of mining using insulating pillar. As regards the simulated insulating pillar 54^#, the height of excavation space should not exceed 50m, and the length should not be more than 48m. Moreover, interval mining sequence could reduce the stress concentration of engineering rock mass, and is conducive to engineering stability.

Key words: rock mass excavation, ground pressure hazard, microseismic monitoring, numerical simulation