露头区工作面边界防水煤岩柱留设方法

Method for Setting Boundary Waterproof Coal and Rock Pillar of Working Face in Outcrop Area

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。

For the problem that working face mining in outcrop area is threatened by boundary aquifer and need to set waterproof coal（rock） pillar,taking 1708^-1 working face in Duolun Xiexing Mine as the example,we use field measurement and theoretical analysis to determine the boundary of immersion object s aquifer,the setting width of boundary waterproof coal（rock） pillar and the hazardous area.The results show that the setting width of waterproof coal（rock） pillar of 1708^-1 working face including from the first openoff cut 0 to 530 m,530 to 729 m and from the second open-off cut 0 to 799 m is 55.7 m,48.3 m and 72.2 m respectively.The hazardous areas at 1708^-1 working face are from the first open-off cut 578 to 660 m and from stopping line to north 232 m.The working face is threatened by water inrush in mining process,taking the measures of aquifer grouting reconstruction or working face moving can prevent water inrush accidents.