地表水体下厚煤层综放工作面安全开采技术

Safety Mining Technology of Fully Mechanized Coal Seam under Surface Water Body

为了保证地表水体下综放工作面安全回采。以山西某矿为试验矿井,采用钻孔电视和分段注水试验对矿井导水裂缝带发育高度进行探测,对地表沉降进行了监测分析,并对水体下工作面开采进行了涌水量监测,实现了水体下工作面的安全回采。研究结果表明:厚煤层综放工作面导水裂缝带发育高度为119.7~127.2 m,裂采比为19.9~21.1;工作面回采前裂隙数量为1~2条,宽度以4 mm为主。当工作面回采后,在132~148 m范围内,裂隙数量最多增加到7条,裂隙宽度可达8 mm。在148~160 m范围内,裂隙数量和宽度与工作面回采前持平;工作面回采后,地表最终产生拉裂缝,最大深度为6.5 m,不会造成地表河水的突然下泻;地表水体下工作面回采过程中无留设保护煤柱,最大涌水量与非水体下工作面开采持平,工作面回采过程中地表水未进入到工作面,实现了安全回采,为类似矿井提供了借鉴。

In order to ensure the safe mining of fully mechanized face under surface water body, a certain mine in Shanxi was taken as a test mine. The safe recovery of the working face under the water body was realized by using borehole television and segmented water injection test to detect the development height of the water guide fracture zone, to monitor and to analyze the ground subsidence, and to monitor the amount of water inflow from the mining of the working face under the water body. The research results show that: the development height of the water-conducting fracture zone in the fully mechanized caving face of the thick coal seam is 119.7~127.2 m, and the crack-to-production ratio is 19.9~21.1. The number of cracks before mining in the working face is between 1~2 mm, and the width is mainly 4 mm. After working face mining, within the range of 132~148 m, the number of cracks will increase to 7 at most, and the width of cracks can reach 8 mm, and the number and width of cracks are the same as those before working face mining in the range of 148~160 m. After the working face is mined, the surface will eventually have tensile cracks with a maximum depth of 6.5 m, which will not cause sudden diarrhea. No protective coal pillars are left during the mining process under the surface water body, the maximum water inflow is the same as the mining under the non-aqueous body working surface, the surface water does not enter the working surface during the mining process and safe mining is achieved. This technique provides a reference for similar mines.