为了构建地下水库并用其存储高盐水，实现矿井水高矿化度处理和零排放，准确评估采空区覆岩导水裂隙带渗透系数；以灵新煤矿地下水库存储高盐水研究为对象，结合灵新煤矿岩石力学以及水文地质参数，运用有限差分软件FLAC^3D，采用数值模拟的方法，利用Mohr-Coulomb本构模型作为岩土体塑性屈服准则，确定了灵新煤矿一采区14^#煤层L1614综采工作面开采过程中垮落带以及裂隙带的发育高度；根据数值模拟结果计算垮落带以及裂隙带的孔隙率和渗透系数，分析导水裂隙带的渗透性在的横向和纵向分布规律。研究结果表明：14^#煤开采后垮落带孔隙率和渗透系数横向分布状态相似，均呈现“盆”状，接近煤壁处最大，中心部分最小；导水裂隙带的发育高度为56 m，垮落带的发育高度为15 m；导水裂隙带的纵向渗透系数由上至下逐渐增大，为1.07×10⁻⁶~0.89 m/s，且垮落带的渗透系数平均值为0.89 m/s。

In order to construct an underground water reservoir for storing high-salinity water and achieve zero discharge through the treatment of highly mineralized mine water, it is necessary to accurately evaluate the permeability coefficient of the overlying strata aquifer in the goaf, taking the storage of high-salinity water in Lingxin Coal Mine as a research object, combined with rock mechanics and hydro-geological parameters, FLAC^3D finite difference software was used to conduct numerical simulations using Mohr-Coulomb constitutive model as a plastic yield criterion for rock and soil bodies. The development height of collapse zone and fracture zone during the mining process of L1614 working face in 14^# coal seam in No.1 mining area of Lingxin Coal Mine were determined. Based on numerical simulation results, porosity and permeability coefficients of collapse zone and fracture zone were calculated, the transverse and longitudinal distribution of permeability in the water-conducting fracture zone is analyzed. The results show that the horizontal distribution of porosity and permeability coefficient in caving zone of 14^# coal after mining is similar, showing a “basin” shape, with the largest near the coal wall and the smallest in the central part. The development height of the water-conducting fracture zone is 56 m, and that of the caving zone is 15 m. The longitudinal permeability coefficient of the water-conducting fracture zone increases gradually from top to bottom, ranging from 1.07×10⁻⁶ to 0.89 m/s, and the average permeability coefficient of the caving zone is 0.89 m/s.