Numerical Simulation on Influence of Rock Mass Strength on Mining Stress Distribution in Fault Zone

Based on the working face advancing along the fault strike as the engineering background, using FLAC^3D numerical simulation software, the elastic modulus of fault zone is determined according to geological strength index(GSI), the influence of the fault zone on the mining stress distribution under GSI is analyzed. The study shows that when the working face is pushed along the fault direction, the stress concentration of the fault pillar and the advance support of the working face is higher than that of the upper working face, and the influence of the fault on the mining dynamic stress distribution is more obvious. The smaller the GSI value in the fault zone, the more obvious the concentration of the advanced support stress in the fault coal pillar and working face, that is, the more developed the fault rock mass fracture is, the stronger the blocking effect on the mining dynamic stress is.