| Coal is rich in our country,in the process of mining,the mine inrush has been the main threat to safe production.For studying the prevention and control of mine water,there has been multiple mature theories by now.In recent years,as the development of mine water prevention and control theories and the gradual popularity of computer technology,numerical simulation technology has been a important mean to mine water prevention and control.Based on ningzhuang coal mine as an example,combining with numerical simulation technology and groundwater dynamics theory,this paper studies the depressurizing schemes and the depressing effect in 21130 mining face.NO.Ⅱ1 coal seam is the main mining coal seam,the Cambrian limestone aquifer under it is much rich of water with high head pressure,at the same time,with the extension of mining depth,the hydrogeological conditions becomes quite complex,but we don’t know the movement laws of it clearly,if we mine directly,it may inrush at any time,which causes a great threat to mining.By means of collecting and analyzing the relevant data,based on the studying of geological conditions and hydrogeological conditions of ningzhuang mine,it establishes the hydrogeological conceptual model and mathematical model of three dimensional unsteady groundwater flow;Bases on the model and Visual Modflow software,it establishes a numerical model of groundwater flow system;Using the calculation methods of groundwater dynamics,it calculates the effect of single-hole pumping and multi-hole pumping respectively;Based on the calculation results,it designs the different pumping schemes,combining with the numerical model,the visual simulation was carried out,the prevention results indicate that the Cambrian limestone aquifer water can be dropped,and draining with multiple holes can achieve good drainage results.Research production can provide decision-making basis for safe mining and the formulating of water prevention and control measures. |
