Study on Collapse Mechanism and Deformation Control Measures of Tunnel Crossing Weak Fault Fracture Zone
The weak fault fracture zone has low rock strength,poor self-stability of surrounding rock and complex geological conditions.When the tunnel crosses weak fault fracture zone,geological disasters such as large deformation and collapse are prone to occur.Through field investigation,the collapse mechanism of the tunnel crossing weak fault fracture zone is analyzed,and the surrounding rock deformation control measures of grouting reinforcement and temporary steel support are put forward.The field monitoring results show that the maximum settlement of the tunnel vault is 19.2mm and the maximum convergence of the arch waist is 13.5mm after the surrounding rock deformation control measures of grouting reinforcement and temporary steel support are adopted.The surrounding rock stress and steel arch stress of the monitoring section are basically stable,and it can be seen that the deformation control measures can effectively improve the stability of the surrounding rock.
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