在井巷掘进中,由于硬质合金焊头和新型强力凿岩机的使用,都趋向于增大炮眼直径与使用大直径药包。根据苏联及我国各矿在使用大直径药包所累积的数据来看(较大断面 S>6～8平方公尺),一般都能提高炮眼利用率、降低主要掘进材料的消耗。然而在小断面(S≤4平方公尺)的应用,缺乏资料,可 In the well excavation, due to the use of hard alloy welding head and new powerful rock drill, tend to increase the diameter of the blasthole and use large diameter kits. According to the accumulated data of large-diameter kits in the Soviet Union and various mines in our country (larger section S> 6 to 8 m ^ 2), the utilization ratio of blastholes can generally be increased and the consumption of main driving materials can be reduced. However, in the small section (S ≤ 4 square meters) of the application, the lack of information can be