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一、前言在某矿区5号沟605米标高的地方，分别向南、北掘进两个水平探矿巷道。施工开始时，我们掘进队按照以往的习惯，采用角锥掏槽爆破方法。这一矿区的岩性、岩层产状、地质构造复杂，爆破效率很低，给施工造成了很大困难，特别在掘进PD605S、CD10E时，巷道穿过基性岩，岩石坚硬系数约为f15（按原地质部岩石硬度等级分类法为Ⅷ级），岩石不仅坚硬，可占性差，而且韧性大，爆破性也不好。小断层错综复什，变化很大。有时在工作面同时出现2～3条断层，纵横交错。岩层走向为南北，向东倾
First, the preface In a mining area No. 605 ditch 605 meters elevation, respectively, south, north dig into the two levels of prospecting roadway. At the beginning of the construction, we digging team according to past habits, the use of pyramid cut blasting method. The lithology, formation and geologic structure of this mining area are complex and the blasting efficiency is very low, which has caused great difficulties in construction. Especially when PD605S and CD10E are driven, the roadway passes through the basic rock with a rock hard coefficient of about f15 According to the original geology of the rock hardness grade classification method for the Ⅷ level), the rock is not only hard, can account for the poor, and toughness, burst is not good. The small faults are complex and vary greatly. Sometimes in the face at the same time there are 2 to 3 faults, criss-cross. Rock formation to the north and south, eastward tilt