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煤层顶板水害严重威胁着陕北地区诸多煤矿的安全生产。以榆横南区魏墙煤矿为例进行顶板富水性探查研究,根据矿井及工作面水文地质条件分析,确定其充水水源为侏罗系延安组—直罗组砂岩裂隙含水层水,充水通道为导水裂缝带。结合物探工程和钻探工程,对煤层顶板进行探查,有效疏放顶板水约20 000 m~3,同时对顶板水进行水质特征分析,判断其水质类型为SO4-Na型。根据物探、钻探成果及水质特征分析结果,确定该矿1301工作面顶板富水区域以静储量为主,动储量补给有限,通过钻孔疏放,顶板水对工作面安全生产影响较小,可以进行正常回采。
Coal seam roof damage seriously threatens the safety of many coal mines in northern Shaanxi. Based on the analysis of the hydrogeological conditions in the mine and working face, the water-filling source was determined to be the fractured aquifer water in the Jurassic Yan’an-Zhiluo Formation sandstone, waterflooding Channel for the hydraulic conductivity of the fracture zone. Combined with geophysical prospecting and drilling engineering, the coal seam roof was probed to effectively clear the roof water about 20 000 m ~ 3. At the same time, the water quality characteristics of the roof water were analyzed to determine the water quality type was SO4-Na. According to the results of geophysical exploration, drilling results and water quality analysis, it is determined that the roof water-rich area of 1301 working face of this mine is dominated by static reserves, and reserves of reserves are limited. Through drilling holes, the influence of roof water on working face safety is small, Normal mining.