我矿系山坡露天矿,每开采一个台段,推进到边缘时都要残留一个不能用常规中爆破爆落的三角岩体,若不处理将给下一个台段的开采造成困难。清除三角岩体,一般采用手风钻法或潜孔钻在下部平台上穿斜孔爆破法。 1.手风钻法用手风钻凿岩爆破法将三角岩体顶部削除一部分,其宽度应大于潜孔钻机行走宽度的3倍,再利用潜孔钻机穿双排孔,实行中深孔爆破。爆破后又形成新的三角岩体,还需重复实施。由于三角岩体顶部受前次中爆破的影响,裂隙较多,手风钻凿岩时易卡 I mine a hillside open pit mine, each mining a Taiwan section, to the edge of the residue should be left in a conventional burst blasting triangle rock, if not deal with the next paragraph will cause difficulties in mining. Clear triangle rock, the general use of hand drill or drill down hole in the lower platform to wear oblique hole blasting method. 1. Hand drill method Hand drill blasting method to remove some of the top of the triangular rock mass, its width should be greater than 3 times the width of the down-hole drilling rig, and then use the double-hole drill drilled hole, the implementation of deep-hole blasting. Blasting and then form a new triangular rock mass, but also need to repeat. As the top of the triangular rock mass affected by the previous blasting, fissures more easy to hand drill when drilling