1.Coal Mining Branch,China Coal Research Institute,Beijing ,China;2.Coal Mining and Designing Department,Tiandi Science and Technology Co.,Ltd.,Beijing ,China;3.Jizhong Energy Fengfeng Group Co.,Ltd.,Handan ,China

In order to study the stress and slip characteristics of the fault plane after the mining of the working face, this paper takes the actual geological conditions of a mine in the Fengfeng mining area as the research background and builds a fault geological stress and slip mechanics model on the basis of theoretical calculation and numerical simulation. The fault slip mechanics criterion and the main influencing factors of fault slip under the influence of mining are obtained and the stress characteristics of the fault plane and the fault slip after the end of the working face are studied and verified empirically. The study results show that the change of normal stress and shear stress caused by mining is the main influencing factor of fault slip. When the lithology parameters of the fault plane are similar, the normal stress and shear stress of the fault plane change linearly with the depth, and the variation of the normal stress with the depth is much larger than the shear stress with the depth. The rate of increase of the normal stress is 19 times as large as the rate of increase of the shear stress. After the coal seam is mined, the fault plane rock mass close to the fault outcrop has a downward sliding trend while the fault plane rock mass which is farther from the fault outcrop shows an upward sliding tendency.