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东川因民矿井巷工程队在平巷掘进(断面为7～7.75M~2,穿过紫色板岩和厚层矽化白云岩,f=8～12)中,变过去的楔形掏槽法为大直径中空眼规则桶形掏槽法,充分利用大直径超前深孔作为第二自由面,爆破效率获得显著提高,掘进循环可多获得0.185米进尺,计划开拓成本将由50元/米~3降为43.17元/米~3,工班效率由过去的0.24米提高到0.32米,进一步提高了技术经济效益,他们的具体做法是:
Dongchuan Yinmin mine tunnel engineering team in the roadway heading (section 7 ~ 7.75M ~ 2, through the purple slate and thick siliceous dolomite, f = 8 ~ 12), the past wedge cut method is Large-diameter hollow eye barrel rule method, make full use of large diameter advanced deep hole as the second free surface, the blasting efficiency has been significantly improved, excavation cycle can get 0.185 meters footage, planning and development costs will be 50 yuan / m ~ 3 down 43.17 yuan / m ~ 3, class efficiency from the previous 0.24 meters to 0.32 meters, to further improve the technical and economic benefits, their specific practices are: