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采用竖井开拓的地下开采冶金矿山的基本建设,一般竖井工程只占井巷工程总量的15～20％左右,而开凿工期却占井巷工程总工期的35～50%,其他井巷工
The basic construction of underground mining metallurgical mines using vertical shafts generally takes only about 15-20% of the total shaft and shaft workings, and the cut-off period accounts for 35-50% of the total construction period of the shaft and shaft works. Other roadway workers