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针对稳定流“大井”法或者直接利用Theis公式求解含水层水文地质参数时,未考虑边界条件、放水孔流量变化及放水孔间相互影响的情况,在Theis公式和阶梯流量理论的基础上,根据叠加原理和镜像原理,提出了补给边界条件下群孔阶梯流量放水试验的承压含水层渗透系数计算公式,并在桃园煤矿北八采区放水试验中进行了应用.利用所提公式计算的太原组灰岩含水层渗透系数平均值为1.68m/d,并用所求渗透系数对各观测孔的水位稳定降深进行了计算.结果表明:各观测孔水位降深计算值与实测值基本一致,误差率在0.07%~1.50%之间,验证了公式的可行性.
In view of the steady flow “Big Well ” method or directly using the Theis formula to solve the hydrogeological parameters of aquifers, the boundary conditions, the variation of the discharge flow and the interaction between the discharge holes are not considered. Based on the Theis formula and the stair flow theory According to the principle of superposition and mirroring, the calculation formula of the hydraulic conductivity of confined aquifer under the discharge boundary conditions is proposed, which is applied in the drainage test of Beihaachi mining area in Taoyuan Coal Mine. Using the formula The average permeability coefficient of limestone aquifer in Taiyuan Formation is 1.68m / d, and the steady decline of water level in each observation hole is calculated by the required permeability coefficient.The results show that the calculated value and measured value The error rate is between 0.07% and 1.50%, which verifies the feasibility of the formula.