煤层开采覆岩变形损伤是含水层失水主要原因，针对榆神矿区中深煤层开采影响下含水层失水规律研究程度不高问题，根据矿区主采煤层覆岩的地质与水文地质结构特征，总结提出中深煤层开采覆岩损伤变形影响下含水层“侧向直接与垂向渗漏”复合失水模式，以COMSOL多物理场耦合数值分析软件为平台，提出了中深煤层开采覆岩变形损伤与含水层失水数值分析模型的构建方法:①利用岩石力学模块，通过建立煤层开采条件下覆岩采动应力、孔隙率与渗透率耦合关系，模拟输出弯曲带覆岩各剖分节点的位移变形量，计算采动渗透系数变化;利用Mohr-Coulomb塑性破坏准则识别出采掘扰动下导水裂隙带的发育范围;②利用COMSOL软件平台中大变形几何体自动重新剖分计算模块，重新进行网格剖分，形成采动变形二次剖分网格;③在达西渗流模块中，根据含水层与导水裂隙带间的地下水运动状态的转化特征，把采动导水裂隙范围数值处理成达西渗流边界，重新输入采动渗透系数参数，以建立含水层地下水失水分析模型。最后以榆神矿区曹家滩煤矿为分析案例，建立工作面尺度上煤层开采覆岩损伤变形与含水层失水分析模型，模拟得出工作面2-2煤层分层开采(5m采高)条件下导水裂隙最大高度为128m，发育至直罗与延安组基岩含水层内部，含水层失水总量35.84m³/h，其中侧向直接与垂向渗漏失水量分别为23.17,12.67m³/h，煤层开采对近地表松散含水层影响小;一次采全高(10m采高)条件下导水裂隙最大高度为202m，发育至富水性好的风化基岩含水层内部，失水总量增加至130.31m³/h，其中侧向直接与垂向渗漏失水量分别为92.65,37.66 m³/h，煤层开采对松散含水层影响较大。

Overburden deformation and damage caused by coal seam mining is the main cause of water loss from aqui- fer. This paper aims at the problem of limited research on the water loss law of aquifer under the influence of mining the medium and deep coal seams in Yushen mining area. According to the geological and hydrogeological structure characteristics of overburden rock of main mining seam in Yushen mining area,the authors summarize and put forward the “lateral direct and vertical leakage” combined water loss model of aquifer under the influence of damage and de- formation of overburden in medium and deep seam mining. On the platform of COMSOL multi-physical field coupled numerical analysis software,the method of constructing numerical analysis model of deformation damage of overburden and water loss of aquifer in medium-deep coal seam mining is put forward. ① Using the rock mechanics module of the software,the coupling relationship of overburden mining stress,porosity and permeability is established under the con- dition of coal seam mining. The displacement and deformation of each subdivision node of overburden in bending zone are simulated and the change of mining permeability coefficient is calculated. The Mohr-Coulomb plastic failure criteri- on is used to identify the range of water-conducting fracture zone under mining disturbance. ② The secondary subdivi- sion mesh under mining deformation is formed by relying on the auto-subdivision function of large deformation geome- try in COMSOL software platform. ③ According to the transformation characteristics of groundwater flow between aqui- fer and water-conducting fractured zone,the range of mining-induced aquifer fractured zone is numerically treated as Darcy seepage boundary,and re-input the parameters of mining permeability coefficient in the Darcy seepage analysis module. Finally,taking Caojiatan Coal Mine in Yushen mining area as an example,an analysis model of deformation damage of overburden and water loss of aquifer in coal seam mining at working face scale is established. the simulation results show that the maximum height of water-conducting fractured zone is 128 m under the condition of stratified mining (5 m mining height) the 2-2 coal,which develops into the aquifer of bedrock of Zhiluo and Yan’an Formation results in 35. 84 m3 / h of total water loss,and the lateral direct loss and the vertical loss are 23. 17 and 12. 67 m3 / h respectively,which has little influence on the loose aquifer. The maximum height of water-conducting fractured zone is 202 m under the condition of full mining height (10 m mining height),and develops into the weathered strata with well water abundanc3e,results in 130. 31 m3 / h of total water loss,the lateral direct and vertical water loss increase to 92. 65 and 37. 66 m / h respectively,which has great influence on loose aquifer.