天祝煤矿河下采煤安全性分析及防治水技术
Safety analysis and water prevention and control technology of coal mining under rivers in Tianzhu Coal Mine
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摘要: 以天祝煤矿3200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,并结合先期地表移动变形实测成果,对3200工作面回采后造成的地表塌陷进行预测,从而判断地表河流受开采影响程度。结果表明:矿井3200工作面开采后,煤层顶板侏罗系新河组砂岩含水层、风氧化带含水层、第四系松散层、地表河水为主要充水水源,覆岩导水断裂带、封闭不良钻孔为主要充水通道;而回采后地表塌陷变形,金沙河将对工作面切眼0~300 m范围构成威胁。结合现场实际,对工作面开采过程前后,提出了防治水保护措施。Abstract: Taking 3200 working face of Tianzhu Coal Mine as an example, by analyzing the geological and hydrogeological conditions of the mine, the main water filling source and water filling channel of the mining face are determined. Combined with the measured results of previous surface movement deformation, the surface collapse caused by mining 3200 working face was predicted, so as to judge the degree of surface rivers affected by mining. The results show that the sandstone aquifer of the Jurassic Xinhe Formation, the aquifer of the weathered oxidation zone, the Quaternary loose layer and the surface river are the main filling water sources after the mining 3200 working face. The main water-filling channels are the water flowing fractured zone and the closed bad borehole. After mining, surface collapse and deformation, Jinsha River will pose a threat to the working face incision within the range of 0-300 m. Combined with the actual situation on the site, this paper proposes some protection measures of water prevention and control for the working face before and after the mining process.
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