Numerical simulation of the impact risk in stope under different fault slope

Taking the F505 normal fault of Hongling Coal Mine as the engineering background, by using theoretical analysis and numerical simulation, the risk of rock burst in stope along fault strike under different fault slope was analyzed, the degree of impact risk and inducing factors of stope under different fault slope were compared. The results show that with the increase of the fault slope, the stress concentration degree of the fault coal pillar in the upper and lower working face increases obviously, and the stress concentration degree of lower fault coal pillar increases more obviously; the distribution of the advance bearing stress in the working face is asymmetric and the stress peak on the fault side is higher;the fault slip of the basic top position of the lower working face is significantly larger than that of the upper working face, the smaller the fault slope, the larger the slip of the basic top position, and the stope is prone to dynamic load impact accidents. The prevention and control measures of rock burst in stope under different working conditions are put forward. It can provide guidance for safe stoping of working face in fault affected area.