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有色冶金矿山巷道掘进中越来越广泛地使用成套的高效率自行式凿岩和装运设备,因此,许多矿山掘进工人劳动生产率都可提高1倍以上。但是在许多情况下,达到的指标较差。原因之一是掘进循环进尺小,设备出碴量不足;这是由于炮孔利用率低(不超过0.75)和孔深不够产生的。为了研究孔深对炮孔利用率和凿岩爆破指标的影响,特尔内敖兹钨钼公司钼矿在矽卡岩化大理岩掘进工作面作了爆破试验。炮孔直径为42毫米,深为1.5～3.2米。采用有一个不装药孔的桶形掏槽。不装药孔直径为
More and more efficient sets of self-propelled rock drilling and handling equipment are being used more and more in the tunneling of non-ferrous metallurgical mines and as a result, many miners can increase labor productivity by more than double. However, in many cases, the indicators reached are poor. One of the reasons is that the excavation cycle is small and there is not enough ballast on the equipment; this is due to the low utilization of the blast hole (not more than 0.75) and insufficient hole depth. In order to study the effect of hole depth on the borehole utilization rate and the index of rock burst, the molybdenum mine at Tern’Aozi Tungsten Molybdenum Company made a blasting test on the skidding marble face. Hole diameter of 42 mm, 1.5 to 3.2 meters deep. The use of a non-charged hole cut bucket. No charge hole diameter