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奥灰水是汾源井田5号煤层开采的主要水害威胁。采用突水系数法对汾源井田5号煤层底板奥灰突水危险性进行研究。分析了5号煤层底板奥灰水压、开采对底板的扰动破坏,隔水层阻水能力、承压水导升高度、奥灰顶部相对隔水层厚度等因素。结合井田钻孔资料,计算了突水系数,绘制了奥灰突水系数等值线图,划分了井田带压开采安全区、相对安全区、相对危险区和危险区。井田带压开采危安区的划分可为汾源矿井带压开采区采掘方案和矿井防治水工作方案的制定提供参考依据。
Ordovician gray water is the main water hazard threat to No. 5 coal seam mining in Fenyuan Minefield. Water inrush coefficient method was used to study the danger of water inrush from No.5 coal seam floor in Fenyuan Minefield. The factors such as the water pressure of coal in Ordovician coal seam No.5 coal seam, disturbing and destroying the floor, the water blocking ability of aquitard, the height of confined water guide and the thickness of the aquitard at the top of the alumina gray were analyzed. Combined with borehole drilling data, the water inrush coefficient was calculated and the contour map of water inrush coefficient was drawn. The safety zone, relative safety zone, relative danger zone and dangerous zone under well pressure mining were divided. The classification of mine area with pressure mining in Dan’an District can provide a reference for the mining program of Fengyuan mine with pressure mining area and the formulation of mine prevention and control water program.