本文以宁东煤田积家井矿区宋新庄煤矿3煤层回采过程中多次出现集中涌水现象为研究对象，通过水质全分析、有机物检测、三维荧光检测、同位素测试，查明了顶板复合含水层地下水以及井下涌水中主要离子、矿化度、有机物含量特征，从水化学角度得出3煤层集中涌水机理。研究结果表明，宋新庄煤矿在集中涌水之前风氧化带水、直罗组、延安组的水化学类型为SO4·Cl－Na型，采空区水化学类型为Cl·SO4－Na型；在集中涌水后，直罗组与延安组含水层水化学类型为Cl·SO4－Na型，风氧化带水水化学类型为SO4·Cl－Na型，所取集中涌水水化学类型为SO4·Cl－Na型和Cl·SO4－Na型。宋新庄煤矿3煤层回采数次集中出水形成机理为直罗组水先越流补给延安组水形成混合水样，越流过程中发生溶滤作用。由于顶板存在软岩形成离层空腔，离层空腔再接受混合水源补给后发生阳离子反向吸附作用，最终离层空腔破裂溃入工作面造成集中涌水。根据同位素计算，正常回采过程中采空区水中直罗组地下水占比约13%，延安组地下水占比87%；在发生集中涌水过程中，直罗组地下水补给量为24%，延安组补给量为76%。

In this paper, the phenomenon of concentrated water outflow in the mining process of No.3 coal seam in Songxinzhuang Coal Mine of Jijiajing Mining Area in Ningdong Coalfield was taken as the research object. Through whole water quality analysis, organic matter detection, three-dimensional fluorescence detection and isotope test, the characteristics of main ions, salinity and organic matter content in groundwater of roof composite aquifer and underground water outflow were found out, and the mechanism of concentrated water outflow in No.3 coal seam was obtained from the perspective of water chemistry. The results showed that the hydrochemical type of air oxidation zone water, Zhiluo Formation and Yan 'an Formation in Songxinzhuang Coal Mine was SO4·Cl-Na type before concentrated water outflow, and the hydrochemical type of goaf was Cl·SO4-Na type. After concentrated water outflow, the hydrochemical type of aquifer in Zhiluo Formation and Yan 'an Formation was Cl·SO4-Na type, the hydrochemical type of water in wind oxidation zone was SO4·Cl-Na type, and the hydrochemical type of concentrated water outflow was SO4·Cl-Na type and Cl·SO4-Na type. The formation mechanism of concentrated water in No.3 coal seam of Songxinzhuang Coal Mine was that the water of Zhiluo Formation overflows to the water of Yan 'an Formation to form mixed water samples, and the leaching occurred during the overflow process. Due to the existence of soft rock in the roof, the separation cavity was formed, and the cation reverse adsorption occurred after the separation cavity was recharged by the mixed water source. Finally, the separation cavity broke into the working face, which caused concentrated water outflow. According to isotope calculation, in the process of normal mining, the groundwater of Zhiluo Formation in the goaf water accounted for about 13%, and the groundwater of Yan 'an Formation accounted for 87%. In the process of concentrated water outflow, the groundwater recharge of Zhiluo Formation was 24%, and that of Yan 'an Formation was 76%.