Abstract:In order to solve the problem of large deformation of surrounding rock in shallow buried large section composite roof roadway, the 2301 return air roadway is taken as the research object. The reasons for the poor control effect of the original anchor mesh cable support surrounding rock in the return air roadway are analyzed. Targeted optimization support technology schemes mainly based on roof grouting and anchor mesh cable are proposed and applied in engineering. Using long anchor rods and cables to improve the strength of surrounding rock support, enhancing the integrity and deformation resistance of composite roof through hollow grouting anchor rod grouting, and further improving the surface protection strength through steel mesh and grouting methods. After on-site application, the deformation of the surrounding rock did not increase significantly after 120 days of completion of the 2301 return airway support. The maximum deformation of the roof, floor, and two sides were 191 and 117mm, respectively, indicating good control effect on the surrounding rock.
