伊犁一矿5号煤层底板砂岩含水层放水试验及参数计算

为了充分暴露5号煤层底板砂岩含水层的补给条件,查明含水层间的水力联系,计算相应的水文地质参数,从而系统地评价矿井开采水文地质条件,开展“大流量、大降深、长延时”群孔放水试验。利用Theis公式求取含水层水文地质参数,分析放水试验前后含水层的水质变化情况,判断含水层的补给条件。研究结果表明,5号煤层底板砂岩含水层渗透系数平均为0.647 m/d,该含水层透水性、联通性好,但其补给条件差,具有可疏降性,在放水试验区范围内与第四系及其他含水层之间水力联系差。

Dewatering Test and Parameter Calculation of Sandstone Aquifer in No.5 Coal Seam Floor of Ili No.1 Coal Mine

In order to fully expose the replenishment conditions of sandstone aquifer on the floor of No.5 coal seam,it is necessary to find out the hydraulic connection between aquifers and calculate the corresponding hydrogeological parameters,so as to systematically evaluate the hydrogeological conditions of mining,and carry out the"large flow,large drawdown and long time delay"group hole dewatering test.This paper used Theis formula to calculate the hydrogeological parameters of the aquifer,analyzed the water quality changes of the aquifer before and after the dewatering test,and judged the supply conditions of the aquifer.The results show that the permeability coefficient of the sandstone aquifer in the floor of No.5 coal seam is 0.647 m/d on average.The aquifer has good permeability and connectivity,but its supply condition is poor and it can be drained.The hydraulic connection between the aquifer and the quaternary system and other aquifers is poor within the range of the dewatering test area.