人工解放层在冲击地压防治中的应用实践探索

Practical Exploration and Application of Artificial Liberated Layer in the Prevention and Control of Rock Burst

为解决煤层上方坚硬岩层问题,根据煤层上覆岩层赋存情况,确定影响冲击地压的主关键层位高度,确定高位钻场施工层位,由高位钻场施工散射状爆破钻孔至冲击地压主关键层后进行顶板爆破,破坏冲击地压关键层位的完整性,降低关键层位大面积悬顶造成的静载以及其达到极限跨距后断裂、滑移造成的动载。主关键层位爆破形成的破碎带,形成缓冲吸能带,对更高位岩层破断、滑移时产生的能量进行缓冲耗散,从而在根源上消除诱发冲击地压的能量源。

In order to solve the problem of hard rock strata above the coal seam,according to the occurrence of the overlying rock strata of the coal seam,the height of the main key layer affecting the rock burst is determined,and the construction layer of the high drilling site is determined.Roof blasting is carried out after the scattered blasting borehole is drilled from the high level drilling site to the main key layer of rock burst,which destroys the integrity of the key layer of rock burst.Reduce the static load caused by the large area suspended roof of the key layer and the dynamic load caused by fracture and slip after reaching the limit span,and the broken zone formed by the blasting of the main key layer to form a buffer energy absorption zone.The energy produced by the fracture and slip of the higher rock strata is buffered and dissipated,so as to eliminate the energy source that induces rock burst at the root.