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一、概说:目前在手掘坑道中最主要的问题之一是提高炮眼的利用率,消灭残留炮眼,以前我队手掘坑道炮眼利用率是很低的,平均在60~70%左右,当然炮眼的利用率与合理的布置炮眼、装药量的多少、炸药的威力大小、堵塞物等有很大的关系,但在同样的条件下,增加起爆对提高爆破效率有很大关系,为了加快手掘坑道的效率,打开跃进门路,解决残留炮眼问题,我们采用了弹壳爆破,和弹壳扩底爆破,取得了良好的效果,消灭了残留炮眼,将炮眼利用率由60~70%提高到100%。
I. Overview: At present, one of the most important problems in hand excavation tunnels is to improve the utilization of blastholes and eliminate residual blasthole. In the past, the utilization rate of mine tunnels by hand was very low, with an average of 60-70% Of course, the utilization of the blasthole and the reasonable arrangement of the blasthole, the amount of charge, the size of the power of explosives, plugging, etc. have a great relationship, but under the same conditions, increased detonation to improve blasting efficiency has a great relationship, Accelerate the efficiency of hand excavation tunnel, open the leap-forward path and solve the problem of residual blasthole. We adopted the shell blasting and the shell bottom blasting, and achieved good results, eliminating the residual blasthole and increasing the blasthole utilization from 60% to 70% 100%.