基于渗流井理论的放水试验数值模拟及水文地质参数不确定性分析

[目的]建立可靠的地下水数值模型,为煤矿矿坑涌水的预测提供参考。[方法]采用Modflow-2005中的Conduit Flow Process(CFP)方法对某煤矿放水试验进行模拟,并用局部灵敏度分析方法进行水文地质参数不确定性分析。[结果]建立了"渗流—管流耦合模型",经过反复调参,分析拟合结果,求得最佳拟合的水文地质参数。通过灵敏度分析,获得最大的灵敏度参数。[结论]研究区内含水层渗透性差异比较大,在疏放水过程中要做好预防措施;灵敏度分析结果表明,井管C值对放水试验影响最大,纵向上侏罗系下统延安组渗透系数的影响大于其他含水岩组。

Numerical Simulation and Analysis of Hydrogeological Parameter Uncertainty Based on Seepage Well Theory

[Objective] To establish a reliable groundwater numerical model, and to provide reference for the prediction of coal mine pit water inflow.[Methods] The flow process conduit(CFP) of Modflow-2005 was used to simulate the dewatering test of a coal mine, and the uncertainty analysis of hydrogeological parameters was carried out using local sensitivity analysis method.[Results] A coupling model of seepage and pipe flow was established. After repeated adjustment and analysis of fitting results, the best fitting of the hydrogeological parameters was obtained. Through sensitivity analysis, the maximum sensitivity parameter was obtained.[Conclusion] There are big differences in the permeability of the aquifers in the study area, precautions should be taken in the process of drainage. The sensitivity analysis results showed that the conductance of the pipe has the greatest influence. Vertically, of Lower Jurassic Yan''an group(J₂Y)the permeability was higher than that of other aquifer groups.