Abstract
The deformation and failure of large faults caused by coal seam mining are easy to form channels connected with aquifers, which is an important threat to the safe mining of coal seams. This study takes Beigongcun No.1 fault in No.7 mining area of Dongtan Coal Mine as a case, aiming to explore the deformation and permeability resistance of large faults. Through the establishment of engineering geological model, the FLAC 3D software is used to simulate the fluid-solid coupling of the mining process. The results show that as the working face advances, the compressive stress within 40 m from the fault decreases significantly, and it is most affected by mining at 20 m below the coal seam after mining to the fault. The calculated fault permeability strength is lower than the Ordovician limestone water pressure. Further simulation of fault mining with different dip angles shows that the failure modes are basically the same, but the failure depth is different. In the dip angle of 50° to 80°, the fault failure depth of 65° is the smallest, and the fault resistance strength of 60° is the largest. This shows that the depth of fault failure is the largest under a special dip angle.
Published Version
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