Abstract: As isolated working face is influenced mutually by side abutment pressure of goaf at both sides, the risk of rockburst is extremely higher than that in the general working face, so it is more likely to induce rock burst with the whole instability. Although large island faces can effectively avoid such accidents, there still exists local rock burst. Aiming at study the characteristics of the local rock burst of large isolated working face, it would be able to analyze the three-dimensional stress state within coal seam through building the mechanical model, further deduce the principles of shear failure of local coal from the shear failure of infinitesimal coal and propose the criteria for local rock burst occurring in large isolated working face. The research results provide a theoretical basis for mining large isolated working face.

Key words: Isolated working face, Three-dimensional stress, Shearing stress, Local shear failure