Analysis Of Water Enrichment Characteristics And Drainage Of Limestone Karst Water In Suntuan Coal Mine

With the increase of coal mining intensity,the hydrogeological conditions of the mine are becoming more and more complicated.According to statistics,in September 2008,when the 1028 working face of Suntuan Coal Mine was mining 10 coal seams,the coal floor limestone water inrush accident occurred under the influence of the fault.The maximum water volume was about 100m3/h,which affected the working face for nearly 20 days.produce.For the safe mining of the 10th coal seam,it is very important to analyze the water richness and drainage of the limestone karst water from the first to fourth layers of the Taiyuan Formation in Suntuan Coal Mine.Through research,the main conclusions are as follows:(1)Based on the collected hydrogeological basic data,the thickness of the first to fourth layers of limestone in the Taiyuan Formation of Suntuan Coal Mine,the development of karst,the hydrodynamic and hydrochemical characteristics of the limestone water were analyzed,and the water richness of the Suntuan Mine was studied.The relationship with burial depth shows that as burial depth increases,karst development tends to deteriorate,that is,water richness tends to decrease;(2)The comprehensive fuzzy evaluation method is adopted to select three indicators of limestone thickness,unit water inflow and permeability coefficient to evaluate the water richness of Suntuan coal mine.There are areas with strong water richness in some parts,and the overall water richness of Suntuan mining area is weak to medium;(3)Simulate the groundwater flow system by constructing a hydrogeological conceptual model and establishing a mathematical model.After the model is verified,the simulated results are compared with the actual observation results,and the obtained results are more consistent with the actual underground drainage;(4)According to Visual Modflow numerical simulation to obtain the water head value of the gray water in the study area before and after the decanting,calculate the water inrush coefficient value of each position in the study area before and after the decanting by the water inrush coefficient method,and use the surfer software to draw the contour map.It was found that the water inrush coefficient in a larger area in the western part of the mining area has been reduced to below 0.06 MPa/m after dewatering;through the analysis of the water level drop in the pumping test and the range of influence,the restoration water level and the static water level,it is concluded that the Taiyuan Group 1 to 4 The recharge condition of the layered limestone aquifer is poor,and the limestone water in the Suntuan mining area can be drained.