parallel-cut blasting 平行空炮孔掏槽爆破
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 %。
The study has provided a ba se for design of blasting parameters of parallel cut.
为 含空孔直眼掏槽爆破参数设计提供了依据。
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