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为了研究采动影响下断层带附近应力演化规律,以山东鲁西矿区某矿地质资料为背景,基于FLAC3D数值模拟软件和正交试验方法,依次模拟了断层倾角为30°、45°、60°、75°和断层落差为6、10、20、30 m等工况下断层带附近应力峰值的演化规律。结果表明,开切眼布置在上盘开采时断层带附近的应力集中程度远大于下盘开采,并且应力峰值随着断层倾角和落差的增大而增大,当断层倾角为75°,落差为30 m时,支承压力峰值达到了47.3 MPa,并且随着工作面推进过程中距离断层越近,煤壁前方支承应力越大,其冲击危险程度也越高。
In order to study the evolution of stress in the vicinity of fault zone under the influence of mining, taking the geological data of a mine in Shandong Luxi mining area as a background, based on FLAC3D numerical simulation software and orthogonal test method, the fault dip angles of 30 °, 45 ° and 60 ° , 75 ° and fault drop of 6, 10, 20, 30 m and other conditions of the evolution of the peak stress near the fault. The results show that the stress concentration near the fault zone is larger than that under the lower plate when the open cut is placed on the upper plate and the stress peak increases with the dip and fall of the fault. When the fault dip is 75 °, the drop is 30 m, the peak pressure of support reached 47.3 MPa, and as the working face moved closer to the fault, the greater the bearing stress in front of the coal wall, the higher the impact risk.