Study on stress propagation law and prevention technology of working face crossing fault near goaf

The 1313 work of Xinglongzhuang Coal Mine faces nearly 7302 goafs and is affected by faults, which has potential rock burst risks. In this paper, Through the combination of theoretical analysis and FLAC3 D numerical simulation, the stress change of the working face affected by the fault is deeply analyzed. The results show that the cutting effect of the fault leads to the stress concentration area at about 15 m in the upper and lower walls of the fault, and the fault activation phenomenon occurs. FLAC3D numerical simulation results show that the maximum stress in the fault area is located at about 20 m away from the goaf, and the stress at the fault increases from 41.2 MPa to 53.1 MPa. The peak stress of the working face appears at about 15 m across the fault, and the peak value is 20.1 MPa. The stress level of the hanging wall of the fault is higher than that of the footwall, and the influence range is about 50 m before and after the roadway passes through the fault. Finally, aiming at the induced energy treatment scheme of fault during the excavation of 1313 working face in Xinglongzhuang Coal Mine, the method of large diameter borehole pressure relief and bottom coal area prevention and control scheme is put forward.