中国矿山工程

Rock tunnel excavation is carried out within the range of close range coal seams. Due to the formation of goaf after the completion of close range coal seam mining, severe deformation of adjacent tunnels is caused. The excavation of the Shimen main roadway at the boundary of the 15th mining area in Tucheng Mine is a typical close range coal seam group roadway excavation. After the completion of the mining of the 12th coal seam in the lower layer, a goaf is formed, and the overall roof collapses, causing severe deformation of the Shimen main roadway at the boundary of the 15th mining area. In response to the problem, numerical simulation analysis shows that current support measures are prone to causing bottom bulging in the roadway, with a maximum bottom bulging amount of 93. 9 mm. A roof cutting technology process has been developed, and through comprehensive calculations, the cutting position point is at the 151212 mining face transportation roadway, with a cutting height of 15 m. After the implementation of roof cutting, the roadway will be observed in the later stage, and the maximum force on the roadway anchor cable is 160 kN, with a maximum displacement of 155 mm, and overall stability. The research results and methods have certain guiding significance for roof cutting in other mines.