兖州矿区兴隆庄煤矿下组煤底板岩溶水参数计算及突水危险性评价

Lower Group Coal Seams Floor Karst Water Parameter Computation and Water Bursting Hazard Assessment in Xinglongzhuang Coalmine, Yanzhou Mining Area

深部煤层开采存在来自底板的高承压奥灰岩溶水威胁,水头压力高,突水系数大。以兖州矿区兴隆庄煤矿为研究区域,对该矿下组煤第Ⅰ勘探区开展了井下孔组放水多孔观测的大型放水试验工作。基于孔组放水多孔观测试验结果,利用解析法计算了开采煤层底板含水层的水文地质参数;研究了疏水降压能否有效降低奥灰对17煤的突水系数问题。结果表明:在放水孔组区域存在不同方向上的水文地质参数;疏水降压的方式能有效降低放水孔区域奥灰对17煤的突水系数。

Floor confined Ordovician limestone karst water has threatened deep part coal seam mining with high head pressure and large water bursting coefficient. Taking the Xinglongzhuang coalmine, Yanzhou mining area as the study region, carried out large-scale underground borehole group outflow test with multiple observation holes in the exploration area I of the coalmine lower group coal seams. Based on the observed results, using the analytic method computed hydrogeological parameters of the mined coal floor aquifer;studied if the draining depressurization can lower down the water bursting coefficient of Ordovician limestone water on coal seam No.17 effectively. The result has shown that different oriented hydrogeological parameters have been existed in the dewatering boreholes region; the draining depressurization mode has been confirmed that it can effectively lower down the water bursting coefficient in dewatering boreholes region.