Numerical Analysis of the Influence of Tunnel Excavation on the Changes of Surrounding Rock Stress and Displacement

The Argveta exit of No. 2 Tunnel in Georgia is taken as the research object, and the three-dimensional geological numerical analysis model of the tunnel is established. The model simulates the construction condition of full-section tunnel excavation through passivation, and discusses the variation law of stress and displacement caused by excavation. According to the study results, with the construction of the tunnel, the surrounding rock pressure increases gradually, which has a lot to do with the tunnel excavation footage and temporary support time; the deformation of tunnel entrance is greatly affected by tunnel excavation, which has a gradual Increasing trend; for the simultaneous construction of tunnels with different spans, the impact of the excavation of a large-span tunnel on the rock, soil, temporary lining and the secondary lining is greater than the stress and deformation of a small-span tunnel.