Groundwater Dynamic Characteristics And Its Numericalsimulation In Bojianghaizi Mine

Thereis a lot of coal resource in Dongsheng mines in the north of Ordos basin.Because the middle Jurassic aquifer was influenced by contineous depositional environmentearly and controlled by the late Yanshan Movement and neo-tectonic movement-This aquifer has pore-fracture structure and its water-abundance is uniformity, which leads to tremendous threat to the mining safely. Studying dynamic characteristics of groundwater and predicting variation of water inflow are an important prerequisite for solving such problem.On the basis of consulting relevant materials at home and abroad,Bojianghaizi mine is taked for anexample,with analyzing geological conditions and hydrogeological conditions systematically.Diswatering test was implemented about the 113101 and 113106 work faces respectively,and groundwater dynamic features were analyzed during theprocess. Hydrogeological parameters are calculated;abundance of water-bearing in aquifer is evaluated,which the geological structure and deposit environment is their influence factors.Based onthe research work above,the hydrogeological conceptual model andthree-dimensional mathmatical model of flow are established,and hydrogeological parameters areobtained byidentifying and verifying the model.Predicted groundwater inflow of the 113106 work face during mining by numerical model is as near as Jules Dupuit’well-water inflow. These results will provide an important guides for the design of the drainage capacity of the working face during mining process.