Coal seam roof water hazard seriously threatens the safe production of many coal mines in northern Shaanxi Province. In this paper, exploration research was carried out on the seam roof water yield property by taking Weiqiang Mine in Yulin-Hengshan Southern Mining Area as an example, and based on the analysis of the hydro-geological conditions of the mine and working faces, it was determined that the water filling source was water from the sandstone fracture aquifer in the Jurassic Yanan-Zhiluo groups, and the water passageway was the water flowing fractured zone, exploration boring was carried out on the seam roof by the combination of the geophysical engineering and drilling engineering, about 20000 m3 of roof water was effectiVely drained, meanwhile the analysis was made on the quality characteristics of the roof water, and it was concluded that the water quality was SO4-Na type. Based on the the geophysical prospecting results, the exploration boring results and the results of water quality analysis, it was determined that the roof water abundant area of 1301 working face of the mine was mainly the the static water and limited dynamic water, the water was drained by boreholes, the roof water had less influence on the safe production of the working face, so the normal coal mining can be conducted.%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20000 m3,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.
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