Abstract:
To effectively control the severe deformation of the surrounding rock at the intersection of the 8002 return tunnel and the dedicated return tunnel of the 80 mining area in Wuyang Coal Mine, a comprehensive analysis method combining field observation, numerical simulation, and on-site industrial tests is adopted. This approach systematically explores the deformation patterns and factors at the intersection and proposes targeted control techniques. The study finds that the main causes of surrounding rock deformation at the intersection include: significant high ground stress due to the deep burial of the tunnel, insufficient stability of the roof structure in the intersection area, and weak surrounding rock with poor overall mechanical properties. In response to the fractured roof at this intersection, a combined support scheme of “roof anchor reinforcement coordinated with grouting stabilization” is proposed. The results of on-site industrial tests indicate that after implementing this scheme, the maximum convergence of the tunnel’s roof and floor is 352 mm, and the maximum convergence of the two walls is 150 mm, effectively controlling the surrounding rock deformation and ensuring the safe and stable use of the tunnel.