针对试验煤矿巷道掘进存在的炮孔利用率低、炸药单耗大等问题,采用大直径角柱形掏槽代替之前的锥形掏槽,同时改变装药结构,现场实践结果表明,炮眼利用率提高了7.50%、循环进尺提高了7.95%、炸药单耗降低22.71%,为提高岩石巷道掘进效率、降低掘进成本提供了一个较好的方法。 In view of the problems such as low utilization rate of blast hole and large unit consumption of the blasting in the tunneling of the coal mine, large-diameter corner undercutting is adopted to replace the previous undercutting and the charge structure is changed at the same time. Field practice results show that the utilization ratio of the blasthole is increased A 7.50% increase, 7.95% increase in cycle footage, and 22.71% reduction in explosive unit consumption, providing a better way to improve tunneling efficiency and reduce tunneling costs.