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针对9采区具体的煤层赋存及生产技术条件,提出了开切眼深孔预爆主动放顶方法。通过对开切眼上方的老顶实施高强度爆破,破坏老顶完整性,削弱老顶间的力学联系,缩短直接顶、老顶初跨步距,同时垮落位置移向采空区后方的切眼附近,使采场矿压显现程度降低,解除冲击威胁;达到了强制放顶的目的。
According to the specific coal seam occurrence and production technical conditions in No.9 mining area, an active roof releasing method with open-hole deep hole pre-blasting was proposed. Through the implementation of high-intensity blasting on the top of the open cut eye, the integrity of the old roof is destroyed, the mechanical connection between the roofs is weakened, the initial step of the direct roof and the roof of the old roof are shortened, and the caving position is shifted to the rear of the goaf Cut near the eye so that mine stope appears to reduce the degree of pressure to lift the threat of impact; reached the purpose of mandatory top.