改进大井法在富含水层下采煤涌水量预测的应用

综合水文地质和工程地质调查结果、室内岩石力学实验、相似模拟试验和三维数值模拟分析,应用地下水动力学理论,改进传统的"大井法",对条带边界下采动过程中工作面涌水量进行预测。针对石嘴山矿区西翼采区特殊的地质背景,对不同开采条件、开采参数下,工作面涌水量变化规律进行了研究。研究结果表明,预留防水煤为150m,工作面采宽为80m时涌水量最小,开采安全性最佳。改进大井法建立在非稳定流泰斯解基础上,较之传统以稳定流为基础的裘布依解预测结果更精确。

Application of the Improved LWM in Water Inflow Forecasting for Coal Mining Under Water-rich Strata

Based on the results of hydrogeological and engineering geological investigation,indoor rock mechanics test,similar simulation experiment and 3D numerical simulation,the water inflow from working face during mining at the boundary of mining strip are predicted by use of dynamical theory of underground water and improved large-well method(LWM).According to the special geological background of the west mining district in Shizuishan colliery,the change raw of water inflow from working face is studied under different mining condition and mining parameters.The studied results show that when the width of waterproof coal pillar is 150 meters and the width of working face is 80 meters the water inflow is the least.The improved LWM for water inflow forecasting based on Theis solution of unsteady flow is more accurate in predicted result than the conventional water inflow prediction based on Dupuit solution of steady flow.