为了成倍的提高井下开采矿山的生产能力,以满足高速度发展冶金工业出需要,在国内有色和黑色金属矿山的厚及中厚以上的矿床条件下,将日益广泛的采用深孔或药室进行大量崩矿的高生产率的开采方法:留矿法、小中段平(横)巷崩矿的空场法(矿房法),阶段强制崩落法,以及其他矿房用深孔崩矿,而矿柱在矿房充填后用崩落法回采的联合法等等。在采用这些开采方法时矿房或矿块出生产效率很高,以及由于凿岩爆破参数的改变,在增大最小抵抗线的条件下,而使要求进行二次破碎的而不合标准大块出率增多。所有由于采矿法本身特点所产生的影响因素,使得这些开采方法的矿房,或矿块底部的结构布置变 In order to double the production capacity of underground mining mines in order to meet the high-speed development of metallurgical industry out of demand, in the domestic non-ferrous and non-ferrous metal mines thick and thick deposits, the increasingly widespread use of deep holes or drug rooms A large number of high-productivity mining methods: ore retention method, small and medium horizontal (horizontal) alley collapse of the open field method (mining method), the stage of forced caving method, and other mining with deep-hole collapse, and Pillar in the mining after filling with caving method of mining and so on. The production efficiency of mines or nuggets is very high when these mining methods are used, and because of changes in the parameters of the rock drilling blasting, increasing the minimum resistance line conditions necessitates secondary crushing instead of standard chunk out Increased rate. All of the factors that have resulted from the nature of the mining law make it possible for these mining methods to change the structural layout of the bottom of the mine or block