Research on law of water gushing of overlying cretaceous aquifer under permeability change of Anding Formation
In order to study the impact of coal mining on underground aquifers in a deep coal mine in Hujilt mining area,a three-dimen-sional 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 re-mains 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.
万方数据
维普
