Forecast And Analysis Of Mine Discharge Based Upon GMS

Mine discharge is an Important index to determine the Hydrogeological condition complexity of the Ore Deposit,Mine Discharge is an Important basis for the Production design department of formulating Mining scheme,determining mine drainage capacity,enacting Well-precipitation measures and Preventing major mine flood. Mine discharge prediction research has been attached great importance,it matters to coal mine safety production.GMS is a groundwater Numerical Modelling software,this paper did numerical simulation on the mine groundwater movement with MODFLOW2000 of GMS,it forecasted and analysed the mine discharge of early mining district,the study area is Shuonan Coalfield, Shanxi Province.On the basis of analyzing the geological conditions,it generalize the stratum according to the Stratigraphic lithology and Geological Structure characteristics,combined with the borehole data of research area,it establishes the geological model of the mine.By analyzing the hydrological geology characteristics of regional aquifer,the recharge,runoff and discharge of groundwater,and other hydrogeology conditions, it generalize the aquifer,after analyzing the Water filling factors, it establishes the hydrogeological conceptual model. According to the hydrogeology conditions of the research area, considering previous work experience and the expert analysis opinion, it set the boundary conditions and then establishes the Groundwater mathematical model.According to the geological model and the generalized principles on water-bearing zones of the hydrogeological conceptual model,it establishes the hydrological geological body with GMS.In accordance with the mathematical model and the boundary conditions,using grid method, it establishes the numerical model of the mine,it forecast the mine discharge in different exploitation cases by solving the numerical model,and then compares the prediction result with the great well method.Because the coalfield pioneering scheme has not yet been set, the emphasis of this research is the initial mining area of early mining section of the preliminary design.The research area scope includes the following strata:Majiagou Formation,Benxi Formation,Taiyuan Formation,Shanxi Formation and Cenozoic loose sediments.This research generalize the strata to 31 big level,and generalized the aquifer to nine water-bearing zones and one stable aquiclude.The numerical simulation forecast the maximum mine drainage after mining 4 coal seam,and the one after mining 4 coal seam and 9 coal seam.The results indicate that:when mining the 4,6 and 9 coal seam of shanxi group and taiyuan group,the upper and middle Permian aquiclude can play the role as a water-resisting layer,it won't cause massive leakage to cenozoic erathem groundwater;The stable biggest mine discharge of 4 coal seam after mining is 12910m3/d, slightly higher than the result 9993.64m3/d that the great well method forecasted; The stable biggest mine discharge of 4 and 9 coal seam after mining is 19385m3/d,smaller than the result 29673.8m3/d of the great well method.It suggest adding specially hydrogeology work and finding out the hydrogeological property of the mining fault,formulating hydrogeological dynamic observation scheme combined with the actual conditions,ensure the safety production in coal mine.