Abstract: This paper presents the monitoring results of tunnel deformation, stress in supporting structures and rock mass displacement during the construction of Tianjingshan Tunnel. The surrounding rock mass can be classified as IV or V grades, which are the broken rock masses. The tunnel stability was evaluated and predicted based on the monitoring results. The supporting parameters were adjusted based on the tunnel stability evaluation. The results indicate that, the construction monitoring, analyses and information feedback have significant importance for highway tunnels under complicated geological conditions. It has also signification importance for the cost saving and safety assurance.

Key words: Soft Rock Mass, Convergence Deformation, Stress in Supporting Structures, Displacement in Rock Mass, Tunnel Stability