Risk Assessment Of Roof Water Inrush In Coal Seam Of Xiangshan Mine Based On Multi-source Information Fusion

Mine water disaster is one of the main disasters of coal mine safety production.With the continuous utilization of coal resources,the coal mining is gradually extended to the area with large buried depth and complex geological conditions,the mining mode is developing from single seam to multi seam.The hydrogeological condition of the mine is more complex,and the mine disaster prevention work is facing greater challenges.There are great practical value for guiding the work of water prevention and control in coal mines to forecast of coal seam roof water hazard,evaluation of aquifer water rich by a more accurate and convenient method,study on cover rock stratum failure law of double seam mining and predict the risk of aquifer to coal seam mining.In this paper,the Xiangshan mine,located in the northeast of the Carboniferous Permian coal field,is the research area.Through the comprehensive analysis of exploration and production data,summed up the mine water-filled factors and related factors of mine inflow,analysis of mine roof water-filled source is Lower Shihezi Formation and Shanxi formation sandstone fissure aquifer,water-filled channel is mainly mining cracks,the water-filled strength of the mine is controlled by many factors,such as structure,height of fractured water-conducting zone and so on.According to the actual situation of the mine,selected water rich sandstone thickness,net-to-gross ratio,drilling fluid consumption,coring rate,depth,geologic structure features as the main control factors,using MATLAB improved AHP to determine weights and establish water enrichment evaluation model,using GIS for multi-source information fusion evaluation of coal seam roof water yield capacity,the aquifer water is divided into weak water rich area,rich in water,rich in water,weak medium strong water rich and strong water rich area of five grades,and the map of water-richment divisions can be get.Through the simulation of similar material and RFPA2D numerical simulation the failure law of overlying rock under the condition of double coal seam mining is studied.the simulation shows that the prone position of roof abscission layer,and the Failure morphology of the overlying strata is caved zone-crack zone-caved zone-crack zone-bending zone from bottom up.The 3#coal mining splitting ratio is 20 tines,5-1#coal mining fissure mining ratio is 22.3 times,and the roof caving degree zoning map is drawn up.After setting water hazard classification standards,classified and superposed the aquifer water zones and caving degree zoning map by GIS,and then the risk of water filling in the roof of coal seam is divided into five areas,which are safe,safe,medium,dangerous and dangerous.5-1#coal mining roof water hazard area significantly greater than 3#coal mining.The mine is seriously threatened by the roof water when the mine is mined in the north second mining areas in the future,and the South first and south second mining areas are relatively safe.The research results are of great significance to guide the work of mine water prevention and control.