Study on mechanism and prevention technology of external dislocation induced rock burst in terminal line of working face along goaf

In order to master the stress distribution law and impact risk of goaf roadway surrounding rock during staggered mining outside the terminal line, based on the engineering background of 22307 working face in Cuimu Coal Mine, the stress variation characteristics of the terminal line under three conditions of internal dislocation, external dislocation and flush were analyzed by numerical simulation. It was proposed that the roof linkage in goaf was the main cause of rock burst in goaf roadway, and the roof linkage conditions were studied. The results show that the roof linkage between the terminal line after external dislocation and the lateral goaf will bring higher impact risk. The roof linkage is affected by thick hard roof, district sublevel coal pillar and mining width of double working face at the same time. By taking roof precracking measures in the staggered area outside the terminal line, the energy and frequency of micro seismic events are significantly reduced, and the safety production during the final mining period is guaranteed.