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在无底柱分段崩落采矿过程中,由于予先钻凿的炮孔(简称予留孔)的变形破坏,严重影响爆破质量,从而造成老顶、隔墙、立槽、“眉线”破坏等现象频繁产生,恶化了放矿条件,提高了矿石贫化损失率,不仅显著降低回采效率,而且严重威胁安全生产。根据对一些矿山的调查研究和初步实践,对护孔问题浅谈一点看法。一、予留孔的变形破坏形式对于矿石非均质、有构造破坏、松散不稳固的矿山,在凿岩过程中炮孔就开始产生变形;炮孔在予留时间中,由于爆破震动、
In the subsea caving mining process, due to the pre-drilling of the blast hole (referred to as the left hole) of the deformation and destruction, seriously affecting the quality of blasting, resulting in the old roof, wall, standing slot, “brow line” damage And other phenomena occur frequently, exacerbating the ore mining conditions, increasing the depletion rate of ore depletion, not only significantly reduce the efficiency of recovery, but also a serious threat to safe production. Based on the investigation and preliminary research on some mines, a brief comment on the issue of retaining holes was put forward. First, to leave the hole deformation and destruction of the form of ore heterogeneity, structural damage, loose and unstable mine, the hole in the drilling process began to produce deformation; blasthole in the stay time, due to blasting vibration,