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近十几年来,四川石棉矿采取深孔分段爆破成井方法,逐步取代了其它天井掘进法。1978年曾在一个月内,用深孔法掘进了五个天井,达到月进111.8米的水下。众所周知,深孔法比浅眼钻爆掘进有许多优点,由于操作人员钻孔和爆破时都远离掌子面工作,作业安全省力,工艺简单,工效高,所以为工人所乐于采用;但它还存在一些缺陷,如分段高度小、爆破循环多、炮孔利用系数低、炸药消耗量大
Over the past decade or so, the asbestos mine in Sichuan has taken the deep well section blasting method and gradually replaced the other well excavation method. In 1978, within one month, five pavilions were excavated using the deep-hole method, reaching a depth of 111.8 meters per month. It is well-known that the deep-hole method has many advantages compared with the shallow-hole drilling method. Because operators are far away from the face during drilling and blasting, their work is safe and labor-saving, the process is simple and the work efficiency is high. Therefore, There are some shortcomings, such as sub-height, blasting cycle, blasthole utilization factor is low, explosive consumption