为了进一步探查宁东煤田宝塔山砂岩含水层的水文地质条件，为下组煤底板砂岩水害防控提供基础资料，采用井下放水试验计算了含水层的水文地质参数，论证了含水层的可疏性。根据宝塔山砂岩含水层单孔放水试验放水孔和1个观测孔、2个观测孔资料，利用解析法计算宝塔山砂岩含水层渗透系数平均值分别为0.301、0.219 m/d，影响半径平均值分别为691、914 m，采用图解法得到的影响半径平均值为697 m，根据3次降深放水计算的钻孔单位涌水量为0.071~0.088 L/(s·m)。通过放水试验得到的水文地质参数比抽水试验得到的参数大，宝塔山砂岩含水层水文地质特征表现为渗透性和富水性弱，且富水性不均一，水压和水温高。基于放水试验成果，结合研究区边界条件分析可知，宝塔山砂岩含水层具有较好的可疏性。

In order to further explore the hydrogeological conditions of Baotashan sandstone aquifer in Ningdong coalfield and provide basic data for the water disaster prevention and control of the lower coal floor sandstone, the hydrogeological parameters of the aquifer were calculated by dewatering test, and the feasibility of water drainage from aquifer was proved. The results show that: according to the data of dewatering borehole and one observation borehole, two observation boreholes from single borehole dewatering test of Baotashan sandstone, the average permeability coefficient calculated by analytical method is 0.301 m/d and 0.219 m/d, and the average influence radius is 691 m and 914 m, respectively. The average influence radius obtained by graphic method is 697 m, and the unit water inflow is 0.071-0.088 L/(s·m) according to three times of deep drawdown. The hydrogeological parameters obtained by dewater test are large than those obtained by pumping water test. The hydrogeological characteristics of Baotashan sandstone aquifer are weak permeability and water abundance, the water abundance is uneven, and the pressure and water temperature are high. Based on the results of dewater test and the analysis of boundary conditions in the study area, it is found that Baotashan sandstone aquifer has good drainage ability.