Simulation Analysis on Feasibility of Water Pumping and Water Table Dropping for Pressurized Water Mining in Underground Mine

Based on the seams in North China Taiyuan Formation threatened by high pressurized water in the aquifer of Ordovician limestone, in order to improve t he effective recovery rate of the coal resources, to avoid the waste of the coal resources and to reduce the danger of the pressurized mining, with the analysis on the h ydrogeological conditions of the Ordovician limestone aquifer, an evaluation on the danger of the pressurized mining was conducted.Visual MODFLOW software was ap plied to establish a mine hydrogeological model.A safety water pumping and water pressure was set as 1 MPa and the water pumping quantity from the aquifer in Ordov ician limestone was calculated.A feasibility analysis on the water pumping and pressure dropping was conducted on the water pumping quantity size, mine water draina ge capacity, hydrogeological conditions, comprehensive utilization of the coal resources and others.The results showed that when the water pumping quantity was 8 67 6 m3/d, after 9 days water drainage, the water pressure of the Ordovician limestone would be stable, would be reduced to 1 MPa and would reach the designed safety water level.Thus the water pumping and the pressure dropping would be feasible and the pressurized mining could be safely conducted.