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掘进巷道时有两种基本选择炮眼深度的方法。第一种方法,是根据工作面前面最有利于破坏岩体的条件带的大小来选择炮眼深度,因而能保证高效率的爆破。选择炮眼深
There are two basic ways to choose the depth of the borehole when driving a roadway. The first method is to select the depth of the blasthole according to the size of the condition zone that is most conducive to destroying the rock mass in front of the working face, thereby ensuring efficient blasting. Select the gunhole depth