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我矿采用无底柱分段崩落法进行回采出矿,使用CZZ-700型凿岩台车配备YG-80型凿岩机打φ58毫米的扇形中深孔。根据测量提供的巷道水平剖面图进行炮孔设计,用书面通知操作工人进行台车凿岩。前一个时期由于缺乏必要的验收制度,因此炮孔质量曾出现一些问题,以致影响回采工作,主要问题是:①炮孔合格率低,有的矿块进路的炮孔合格率仅18.2%。②凿岩深度不足,爆破后产生崩落高度不够,进路之间留有隔墙,厚达1.5～2.0米,顶部崩落高度下降达1.0米左右(附图)。③炮孔打的
I mine using non-pillar sub-caving method for mining and mining, the use of CZZ-700 drilling rig equipped with YG-80 rock drill hit 58 mm fan-shaped deep hole. According to the measurement of the horizontal section of the roadway to provide a borehole design, notify the operator in writing to rock drill rig. In the previous period, because of the lack of the necessary acceptance system, some problems appeared in the quality of blast holes, which affected the recovery work. The main problems were as follows: ① The pass rate of blast holes was low, and the pass rate of blasting holes was only 18.2%. (2) The drilling depth is not enough, and the height of avalanches after blasting is not enough. There is a partition wall between the roads with a thickness of 1.5-2.0 meters and a drop height of the top of about 1.0 meters (with photos). ③ blast hole hit