基于地下水流场数值模型的矿井突水量预算

矿井发生特大突水后,第一时间掌握突水水源,并预测突水量的大小,可以为制定水害治理方案提供有力支持。利用前期通过放水试验获取的水文地质参数及建立的井田奥陶系灰岩含水层数值模型,对峰峰矿区九龙煤矿的突水水源及突水量进行了分析计算。结果发现：突水初期与突水点相距2 350m的奥灰观测孔的水位下降趋势与前期奥灰放水试验的基本一致,因此,判断突水水源为煤系地层基底奥陶系灰岩含水层水。实测瞬时突水量为2 778m3/h;利用比拟法得到的Q-S方程预算突水量为2 879m3/h;通过数值模型预算的突水稳定涌水量为2 280m3/h,三者相差不大,以此说明数值模拟在矿井突水量预算中具有一定的实用价值。

Mine Water Bursting Quantity Computation Based on Groundwater Flow Field Numerical Model

When the water bursting has happened in mines, to find water bursting source and predict quantity at first-time can provide essential support on water damage governing scheme drawing up. Using hydrogeological parameters and minefield Ordovician limestone aquifer numerical model from previous outflow tests analyzed and computed water bursting source and quantity in the Jiulong coalmine, Fengfeng mining area. The result has demonstrated that： the water-table lowering trend of an observation hole in Ordovician limestone apart from water bursting point 2350m during initial bursting stage is basically accord with Ordovician limestone outflow tests, thus, the estimation of water bursting source is from the coal measures basement Ordovician limestone aquifer water. Measured instantaneous water bursting quantity is 2778m3/h, using analogue method Q-S equation estimated quantity 2879m3/h, using numerical model estimated stable water bursting quantity 2280m3/h, the results of above three have only little difference, thus can account for the numerical simulation has certain practical value in mine water bursting quantity estimation.