Research On Risk Assessment Of Coal Seam Roof Water Inrush And Simulation Prediction Of Water Inflow In Korjay Mining Area Of Xinjiang

The problem of mine water inrush is an important geological problem which threatens the safe mining of coal.It is necessary to predict and grasp the water inrush risk and water inflow in advance in order to prevent mine water hazard accidents and ensure the safety of mine production.Based on the in-depth analysis of the hydrogeological and engineering geological conditions in the mining area of Korjay,Xinjiang,this paper predicts and evaluates the risk of roof water inrush in the coal seam of the main mining area based on GIS.The three-dimensional geological model of the mining area is established based on GMS,and the water inflow in the coal seam mining process is simulated and forecasted.The effect of mining on the regional water resources is analyzed,and the corresponding prevention and control measures and water resources protection measures are put forward.The main research results of this paper are as follows:(1)Based on the GIS system,the spatial distribution thematic map of coal seam roof aquifer is constructed.Based on the variable weight theory,the water-rich of coal roof aquifer is evaluated.and the accuracy is proved by combining the measured water inflow data.At the same time,the development height of water-conducting fracture zone of coal seam roof is calculated and the zoning map of risk of coal seam roof cracking is drawn.Finally,based on the basic principle of "three diagrams method ",the risk of water inrush:in coal seam roof is comprehensively evaluated.The final results show that the middle part of the mining area is a high risk area of water inrush,which should be regarded as the key area of water inflow prediction and prevention.(2)Using GMS groundwater numerical simulation software,the 3D geological model and the groundwater flow field numerical model of the study area are constructed.And the mine water inflow is simulated and predicted by single well mining and group well mining.Taking the No.11 mine as an example,the dynamic variation law of the water inflow with the mining process is simulated.The simulation of group well mining conditions predicts the steady water inflow of each mine in the future large-scale mining.At the same time,comparing the water discharge difference of No.11 mine under the two working conditions.The results show that the flow field will be disturbed greatly when wells drainage at the same time.(3)Based on the hydrogeological model,the influence of mine drainage on surface river flow is simulated.At the same time,it simulates the loss of river flow after setting the no-mining area on both sides of the river,and analyzes the effect of the no-mining area on reducing the loss of river flow.At the same time,the fuzzy mathematics comprehensive evaluation method is used to evaluate the water quality.Finally,based on the results of water inrush risk evaluation and water inflow simulation,some concrete prevention and control measures and water resources protection measures are put forward.