冲击地压应力状态及卸压治理数值模拟

深部开采中的冲击地压现象与巷道、采场围岩的应力状态密切相关，通过爆破卸压改变围岩的应力状态是最为直接和有效的治理措施．采用FLAC^3D对典型冲击地压巷道的应力状态进行了数值模拟，结果显示由于开挖卸荷作用引起的应力集中区域是冲击地压现象频发的部位．提出了两种孔深10m以及延伸辅助眼浅孔3种卸压治理方案，分别模拟卸压后围岩的应力分布状态，结果表明：3种方案都起到了缓解区域应力集中的效果，但延伸辅助眼浅孔方案卸压效果更明显，且打孔及装药容易，与掘进工作同步，是一种经济有效的治理方案．

Numerical Simulation of Rock Burst Stress and Its Control by Stress-Relief

Rock burst in deep mining is closely related with the stress of surrounding rocks of roadways and stopes and the stress-relief by blasting to change the stress of surrounding rocks is a direct and effective way to control it.The stress of a typical rock burst roadway was simulated by FLAC~(3D),showing that in the stress concentrated area,the rock burst takes place frequently.Three relieving shot schemes an extending assistant shallow boring-hole two deep boring-holes(10 m) with different layout were presented to simulate the stress of surrounding rocks after pressure relief.The simulation result shows that all the three schemes can release the concentrated stress to a certain extent.However the scheme of extending assistant boring-hole is more effective than and has many advantages over the other two.In addition,it is easy in drilling and filling,and in step with tunnel excavation.Therefore,it is a cost-effective scheme.