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基于东升庙铅锌矿采矿实践活动,通过理论建模和数值求解,对2号巨型采空区围岩发生大冒落引起的动力冲击灾害进行了研究。研究结果表明:冒高12.8 m的围岩压缩采空区空气引起的极限波速为38 m/s,冲击波在巷道口的极限波速为523 m/s;冒落围岩以38 m/s的速度撞击矿柱引起矿柱内部的最大动应力为9.2 MPa,矿柱在围岩冒落体冲击载荷作用下将发生破坏。
Based on the practice of Dongshengmiao lead - zinc mine, through theoretical modeling and numerical solution, the dynamic impact disaster caused by the big slump of surrounding rock in No.2 gob was studied. The results show that the limit wave velocity induced by air in the surrounding rock compressed mined-out area of 12.8 m is 38 m / s, the limit wave velocity of shock wave at the gateway is 523 m / s, the surrounding rock mass is 38 m / s The maximum dynamic stress inside the pillars caused by impacting pillar is 9.2 MPa, and the pillars will be destroyed under the impact load of surrounding rock.