非完整大井法和水平廊道法计算矿坑涌水量

Estimation of mine water inflow using the partially penetrated virtual large-diameter well method and partially horizontal collector gallery method

完整大井法和完整水平廊道法是目前矿坑涌水量预测中广泛使用的方法,但是受其概化条件限制,计算的涌水量往往偏大。通过某矿山实测矿坑涌水资料与不同方法计算结果的比较,系统论证了将非完整大井和非完整水平廊道分别概化为完整大井和完整水平廊道带来的矿坑涌水量预测误差,并研究了非完整方法中参数的敏感性。研究结果表明:非完整水平廊道法计算结果是实际排水的105. 24%,而非完整大井法计算结果则是实际排水量的127. 24%。采用完整水平廊道法计算的涌水量是实际排水量的149. 92%,而完整大井法则是实际排水量的344. 08%。因此非完整水平廊道法更适合本矿区及条件相似的其他矿山的矿坑涌水量的预算。另外非完整方法中参数的灵敏性分析表明,渗透系数对涌水量计算结果影响最大,是最为敏感的参数。

The fully penetrating virtual large-diameter well method and the fully penetrating horizontal collector gallery method have been widely used to estimate the mine inflow.However,the water inflow was overestimated due to the limitation of application condition.The predicted errors of mine water inflow were systematically evaluated in the condition that the partially penetrated virtual large-diameter well and horizontal collector gallery were inappropriately generalized to the fully penetrating ones based on the measured mine water inflow in a mine.Furthermore,the sensitivity of the parameters in the partially penetrated models was analyzed.The results illustrated that the estimated mine water inflow using the partially penetrated horizontal collector gallery method accounts for 105.24% higher of the measured value, whereas that the partially penetrated virtual large-diameter well accounts for 127.24%.Moreover,the model based on the fully penetrating method,including the horizontal collector and the virtual large-diameter well,respectivoly account for 149.92% and 344.08%.It was concluded that the partially penetrated horizontal collector gallery method was more applicable to estimate the mine inflow in this mine or the mine with a similar geology condition.In addition,the sensitivity analysis for the parameters in the partially penetrated virtual large-diameter well method showed that the hydraulic conductivity had the greatest influence on the estimation of the water inflow.