关键词: 近距离, 采空区下, 非对称变形破坏, 围岩控制技术

Abstract: There are serious problems such as asymmetric deformation and failure of surrounding rock and difficulty in supporting the roadway in the goaf when mining near the coal seam. Based on the project background of 20307 transportation roadway in gaojialang coal mine, Inner Mongolia, the asymmetric deformation and failure characteristics of roadway surrounding rocks are analyzed based on the field monitoring results. The roof on the side of coal pillar sinks heavily and the coal rib spalling is serious. The failure of bolt occurs at the shoulder Angle of roadway and is mainly caused by the tensile fracture of screw segment at the end of bolt and the shear failure at the free end. And asymmetric support technology of roadway is proposed. The side of the column is supported by round steel bolt. The stopper is not supported when the side wall is intact, and the fissures are developed and the gripping areas are supported by FRP bolts. Then, FLAC3D is used to simulate the supporting effect and field test is carried out in the 20307 haulage roadway. The results show that: During the mining period, the maximum subsidence of the roof is 34.6mm, and the displacement of the side side of the pillar is 19.6mm, and the displacement of the mining side is 17.3mm. The supporting effect is better when there is no roof fall and rib spalling