安定组地层渗透性变化下的覆岩白垩系含水层涌水规律研究

Research on law of water gushing of overlying cretaceous aquifer under permeability change of Anding Formation

为了研究呼吉尔特矿区某深埋矿井煤层开采对地下含水层的影响,采用地下水三维数值模型对大采高深埋煤层开采过程中地下水流场的变化进行模拟研究。模拟结果显示,煤层开采对顶板白垩系含水层及侏罗系直罗组含水层流场均产生较大影响,工作面开采过程中安定组地层渗透系数发生改变,使其隔水性能产生变化,上覆白垩系含水层参与井下涌水程度随之改变,导致工作面涌水量呈阶梯状变化趋势。由于白垩系含水层富水性强于直罗组含水层,白垩系含水层依然是工作面的主要涌水来源,其贡献度达到70.4%。该结果可为呼吉尔特矿区深部大采高煤层的防治水重点提供依据。

In order to study the impact of coal mining on underground aquifers in a deep coal mine in Hujilt mining area,a three-dimensional numerical model of groundwater was used to simulate the changes of groundwater flow field during the mining process of large mining height and deep coal seams.The numerical simulation results show that coal seam mining has a significant impact on the flow field of the Cretaceous aquifer and the Jurassic Zhiluo Formation aquifer in the roof,during the mining process of the working face,the permeability coefficient of the Anding Formation changes,resulting in changes in its water resistance.The participation of the overlying Cretaceous aquifer in underground water gushing also changes,resulting in a stepped change trend in the water gushing of the working face.Due to the stronger water abundance of the Cretaceous aquifer compared to the Zhiluo Formation aquifer,the Cretaceous aquifer remains the main source of water gushing in the working face,with a contribution rate of 70.4%.This result can provide a basis for the key prevention and control of water in the deep and high mining coal seams of the Hujilt mining area.