榆横南区地下采煤对地表水库坝体影响的安全性研究
Safety study on influence of underground coal mining on surface reservoir dam in southern Yuheng Mining Area
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摘要: 以魏墙煤矿1313工作面为例,通过对矿井地质、水文地质条件进行分析,确定工作面开采的主要充水水源和充水通道,结合先期地表移动变形实测成果、应用概率积分法对1313工作面回采后造成的地表塌陷进行预测,从而判断地表水库坝体的损伤程度。结果表明:矿井开采的3号煤层顶板侏罗系延安组第四段和直罗组砂岩含水层为1313工作面开采时的主要充水水源,覆岩导水断裂带为主要充水通道,大气降水、地表水库水体均不会被沟通导入井下;而回采后地表塌陷变形将造成水库坝体的IV级损伤,极可能造成水库水体外溢、灌入下游农田的危险。Abstract: Taking Weiqiang Coal Mine 1313 working face as an example, through the analysis of mine geological, hydrogeological conditions, the main water-filled source and water-filled channel of working face mining are determined, and the surface collapse caused by stoping of 1313 working face is predicted by using probability integral method in combination with the measured results of surface movement deformation in advance, so as to judge the damage degree of surface reservoir dam body. The results show that the sandstone aquifer of the fourth member of Jurassic Yan’an Formation and Zhilao Formation of No.3 coal seam is the main water-filling source in the mining of 1313 working face, and the overlying rock water-guiding fault zone is the main water-filling channel, and the atmospheric precipitation and surface reservoir water will not be communicated into the underground; However, the surface collapse and deformation after stoping will cause grade IV damage to the dam body of the reservoir, which is very likely to cause the overflow of water body of the reservoir and the risk of irrigation into the downstream farmland.
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