二次掏槽

Secondary cut

地下掘进的掏槽,其方式及参数已有相当研究,但装药结构却未予以足够的重视。本文介绍了微差二次掏槽的装药结构,取得了良好的效果,改善了本矿多年破爆效率较低的情况。

The mode and the parameter of the underground tunnelling cut has been studied very deeply;but the method of loading explosive in the blast hole hasn't been given emphasis enough.The method of small di- ffrent seeondary cut is introduced by this paper,which has made more effective result and has improved the situation of the low level of blasting of years in our mine