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。
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 %。
By optimizing blasting parameters, the blasting efficiency of mine tunnel excavation is improved. The speed of tunnel excavation is ultimately increased.
文中通过优化爆破参数，提高了岩巷掘进的爆破效率，最终提高了巷道掘进速度。
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