过去在露天采矿工作中,多半采用2～3公尺的浅眼爆破,最深为4～5公尺。由于炮眼较浅,同时多为下向眼,因此使每个炮眼的装药量、崩落控制量以及台阶的高度都受到很大影响。为了提高炮眼利用率与劳动生产率,我们运用了从台阶顶部垂直向下打深孔,并使孔底扩大爆力集中的爆破原理,从而将浅眼爆破改为由底部打大眼的爆破方 In the past in the open-pit mining work, mostly using 2 to 3 meters of shallow-hole blasting, the deepest 4 to 5 meters. Due to the shallow borehole, while mostly downward to the eye, so that each blasthole dose, the amount of control and the height of the step are greatly affected. In order to improve the utilization rate and labor productivity, we used the principle of blasting vertically downwards from the top of the step and expanding the hole bottom to concentrate the explosion force, so that the shallow blast was replaced by the blasting party