The method is reasonable, and the classifications have a certain benefits to improve blasting efficiency.
该方法分类合理，对提高爆破效率具有一定的指导意义。
Meanwhile, which can improve the blasting effect, made the rock fragment more uniformly, and improve the blasting efficiency.
改善爆破质量，使破碎块度更加均匀，从而提高爆破效率。
Through adopting the parallel cut and inverse initiation, and selecting correct delay-interval, an average blasting efficiency of 90% had been achieved.
通过采用含空孔的直孔掏槽方式、反向起爆，并合理选择微差起爆时间，桩井爆破的平均炮孔利用率达到了90 %。
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