| Fault is an important factor affecting mine safety production.According to most accident data,80%of mine water burst accidents are related to fault.when the excavation work around the fault,the bottom plate is often damaged by abnormal deformation due to the existence of the roadway and working surface,accompanied by a large number of cracks.When the resulting cracks and damage bands extend to the aquifer,it leads to the aquifer.Through the whole process of mining,due to the formation of faults,the mine roadway layout,working surface recovery and even the production process of the whole mine are facing safety risks.Comprehensively using drilling,geophysical exploration and actual disclosure data,the spatial storage characteristics of aquifers and coal seams were analyzed,and the spatial structure relationship between the middle and lower coals and the bottom limestone aquifers and their variation laws were revealed.On the basis of analyzing the evolution law of faults in the mining area and the characteristics of spatial distribution,the natural content and water conductivity of the faults in the west mining area of Jiegou Coal Mine and their threat to coal seam mining were studied.A numerical model of FLAC3D was established to study the activation characteristics of faults under adoptive conditions.Analyze the changes in the strength and water conductivity of the fault fracture zone before and after the treatment and the impact zone.Optimization of the anti-water separating coal(rock)column of the middle group coal and the lower group coal mining fault in the west mining area of Jiegou coal mine.The research results are as follows:(1)The water conductivity and the law of recovery activation of faults in the study area are reviewed.(2)According to the Regulations on the Prevention and Control of Water in Coal Mines,combined with the Manual on the Prevention and Control of Water in Coal Mines,considering the influence of the aquifers of tai gray and O-grey,the optimization of the fault-proof water-separated coal(rock)column was carried out in the middle and lower groups of coal.The fault less than 20m does not have protected coal(rock)column.For the main faults with a gap greater than or equal to 20m,according to the detailed rules of coal mine water control and coal mine water control manual,Considering the influence of Taiyuan formation limestone and Ordovician limestone aquifers,the optimization of fault-proof water-proof coal(rock)column was carried out in the middle and lower groups of coal.Middle group coal:F6,F7,F8,F10 and F13 fault two plates are set up 53m,44m,41m,46m,43m coal column,the other faults are left with 20m coal column.Lower group coal:F6,F7,F8,F10,F12,F13,SF4,SF13,SF25,SF29 and SF35 fault plates are set up 55m,69m,41m,55m,20m,43m,30m,30m,21m,25m,27m and 25m coal(rock)columns,with 53m,44m,41m,46m and 54m,F12,SF4,SF13 and SF25 left on the F6,F8,F10 and F13 faults,respectively The lower plates of the SF29 and SF35 faults are reserved for 20m coal(rock)columns.Figure[81]Table[21]Reference[62]... |
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