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地下金属矿井巷工程施工中,因超挖给矿山生产建设带来的危害,已为人所共知。以我矿为例,通过对全矿开拓工程调查,在实测的135个剖而中,扣除允许限差外,还超挖2419.43米~3,折合进尺377.1米,超挖率为11.91％,若以年平均掘进5万米计,因超挖将增加掘进成本89.1万元,扣除工资部份仍需增加64.16万元。为此我矿积极推广运用光面爆破,进一步限制超挖,目前已获得较大成效。本文通过几个实例,谈谈这方面的具体做法和体会,仅供同行参考。
Underground metal mine roadway construction, due to over-excavation to the mine production and construction hazards, has been well-known. In my mine, for example, through the survey of the whole mine exploration project, in the actual survey of 135 sections, deducting the allowable limit, but also over-digging 2419.43 m ~ 3, equivalent to footage of 377.1 meters, overbreak rate of 11.91%, if With an annual average of 50000 meters heading, due to digging will increase the cost of 819,000 yuan heading, after deducting the wage still need to increase 641,600 yuan. To this end, mine actively promote the use of smooth blasting, and further limit the over-excavation, has achieved greater success. This article through a few examples, talk about the specific practices and experiences in this area, only for peer reference.