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开采坚硬矿石的大型矿床时通常使用深爆破孔来崩矿。能钻进直径105毫米、深度50米钻孔的风动冲击装置在国内矿山得到广泛的应用。但是在很多场合下,大直径钻孔能降低岩块的稳定程度和得到大量的非标准岩块。这
Deep mining holes are commonly used for mining large deposits of hard ores. The pneumatic impact device capable of drilling 105 mm in diameter and 50 meters in depth is widely used in domestic mines. However, on many occasions, large diameter boreholes can reduce the stability of rock mass and get a large number of non-standard rock mass. This