采动影响下断层冲击危险数值模拟

摘要

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 stress evaluation laws of fault zone during mining,we use FLAC3D numerical simulation software and orthogonal experiment method to simulate the evaluation laws of stress peak around fault with dip angle of 30°,45°,60°,75°and fault throw of 6,10,20,30 m based on the geological data in Sbandong Luxi Mine.The results show that the stress concentration around fault zone is greater than that on the footwall when open-off cut is located on the hanging wall mining;the stress peak grows with the increase of fault dip angle and fault throw;when the fault dip is 75°and fault throw is 30 m,the abutment pressure peak reaches 47.3 MPa;with the advancing of working face,the closer the distance between the longwall face and the fault,the greater the abutment stress and the higher the impact risk.