Evolution characteristics of mining-induced stress partition of roadway surrounding rock on working face of deep island

Aiming at large deformation of roadway on working face of deep island mining, the dynamic evolution law of the stress in roadway surrounding rock and goaf are studied by means of field measurement, and the evolution characteristics of deformation and failure of surrounding rock are analyzed. The results show that the stress evolution and deformation failure of surrounding rock on working face of deep island mining have obvious stage characteristics, when the distance from the working face is more than 250 m, the surrounding rock of the roadway is not affected by mining, so the stress of surrounding rock changes little, and the deformation is mainly concentrated in floor and coal pillar. The stress of the supporting structure is increased obviously in the range of 100-250 m in front of the working face, the shallow surrounding rock of the roadway is broken, and the coal pillar is squeezed and deformed, which causes the roadway to appear the obvious asymmetric deformation and failure. In the range of 100 m in front of the working face, the stage of strong mining influence occurs, especially in the range of 20-22 m in front of the working face, the vertical stress and space principal stress of the surrounding rock change more significantly, the roof and floor moving closer and the both sides of roadway deformation more prominent, which make the surrounding rock of the roadway shows obvious large deformation and failure characteristics. According to the characteristics of stress zoning in goaf, the dynamic evolution process of the covering rock structure is analyzed. Combined with the evolution characteristics of stress and deformation, the reform suggestions of roadway support are proposed to provide some guidance for the control technology of roadway surrounding rock in deep mine.