越流补给群孔抽水试验的含水层参数计算及应用

抽水试验求解含水层参数时一般采用Theis公式或由公式推导的各类图解法，但这些方法没有考虑特定边界条件和各抽水井之间的相互影响。针对此类方法的不足，根据越流补给条件，结合势场叠加原理，提出了上层越流补给条件下群孔抽水试验渗透系数的计算公式。在某地浸矿山东部待采矿区的抽水试验中进行了验证，利用该公式计算出的含矿含水层的渗透系数平均值为5.1 m/d。利用该渗透系数确定了待采矿区定流量抽水时井径与水位降深的函数关系式，计算得到的各观测孔降深与实测值基本一致，误差在0.7%~6%，验证了该渗透系数公式的可行性，并提出最优井径在0.2~0.3 m之间，为矿山基建提供参考。

Aquifer Parameter Calculation and Application of Pumping Test of Group Holes with Leakage Recharge Boundary

Aquifer parameters in pumping tests usually are obtained by the Theis formula or the graphical methods in-duced by formula. But all these methods didn′t take the boundary conditions and the influences of pumping wells between each other into account. According to this situation,based on leakage recharge boundary and superposition principle,calculation for-mula of permeability coefficient in pumping test of group holes with leakage recharge boundary was proposed. It was verified in pumping test in the eastern diggings of an in-situ leaching mine. The permeability coefficient of this aquifer was calculated as 5. 1 m/d by using the formula,which was used to propose the function relation between radium and drawdown in constant flow pumping test. The calculated value and observed value are basically the same with the error between 0. 7% and 6%,which ver-ifies the feasibility of the formula. It is proposed that the optimal radium varies from 0. 2 m to 0. 3 m,which provides reference to the construction of the mine.