关键词: 不对称采空区, 孤岛工作面, 微震, 应力分布, 冲击地压

Abstract: Co.，Ltd.; 3. College of Mining Engineering，China University of Mining and Technology） Abstract In order to effectively prevent and control rock burst in island working face of asymmetric goaf，the stress distribution law and microseismic evolution characteristics during adjacent goaf are studied. Based on the engineering background of 33_下02 working face in Jining No.2 Coal Mine，the mechanical model of average support pressure of isolated island working face is established by means of theoretical analysis. FLAC3D numerical simulation and microseismic monitoring were used to study the mechanical and failure characteristics of different stages. The theoretical formula of average support pressure of island working face is obtained. In the stage of one side adjacent to goaf，the stress on the goaf side of the working face is high，and the large energy microseismic events are mainly distributed on the goaf side. During the adjacent goaf on both sides，the overall stress of the working face is further increased after being affected by the advanced stress. During the period of adjacent goaf on both sides，large energy events increased and microseismic frequency increased.

Key words: asymmetric goaf, isolated island working face, microseism, stress distribution, rock burst