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针对露头区工作面回采受边界含水层威胁需留设防水煤(岩)柱的问题,以多伦协鑫1708-1工作面为例,通过现场实测与理论分析相结合的研究方法,确定了浸入体含水层边界、工作面边界防水煤(岩)柱留设宽度和开采危险区域。结果表明:1708~(-1)工作面在距第一开切眼0~530、530~729 m范围和距第二开切眼0~799 m范围内的防水煤(岩)柱留设宽度分别为55.7、48.3、72.2 m;1708~(-1)工作面开采危险区域为距第一开切眼578~660 m范围和停采线往北232 m范围内。工作面开采具有突水危险,采用注浆改造浸入体含水层或工作面搬家可预防突水事故的发生。
Aiming at the problem that the coal pillar should be left behind by the boundary aquifer threatening the backcountry face mining in outcrop area, taking 1704-1 working face of Xuanxin as an example, through the combination of field measurement and theoretical analysis, Immersed in the body aquifer boundary, the face of the waterproofing coal (rock) pillar left width and mining danger zone. The results show that the 1708-1 working face has a width of 0 ~ 530,530 ~ 729m away from the first cut and 0 ~ 799m away from the second cut. Respectively 55.7,48.3 and 72.2 m; the danger zone of 1708-1 (-1) mining face is in the range of 578-660 m from the first open cut and 232 m to the north of the cut-off line. Face mining has the risk of water inrush, the use of grouting to transform into the aquifer or face moving to prevent water inrush accidents.