Excavation Effect of Tunnel Slope Reinforced with Anti Sliding Pile in Cold Regions Based on 3D-FEM

In order to analyze the effects of tunnel excavation on the stability of tunnel slope reinforced with anti sliding pile and establish 3D elastic-plastic finite element model, the paper focused on the analysis of the deformation of the structural system, the characteristics of the deformation and the rules of the plastic zone of the surrounding rock. The results showed that in the construction process, the maximum vault settlement was about 28mm; the plastic zone occurred mainly in the place surrounding the sliding pile and part of the earth surface, the plastic zone around the vault at the entry of the tunnel was large and tended to connect with the earth surface; the soil arching effect ensured the stability of the slope during the tunnel excavation and construction.