Abstract: Under the actual working conditions of a tunnel project in Shulan City, Jilin Province, the construction process of the tunnel is simulated and analyzed by using Midas GTS finite element software. The results show that, with the continuous excavation of the tunnel, the tunnel vault and its overlying rock and soil mass gradually settle. The closer to the vault, the greater the settlement value is. The settlement range of the surface caused by the tunnel excavation is about 10 times of the tunnel span length. The rock and soil mass at the bottom of the tunnel chamber will produce upward uplift displacement during the tunnel excavation, and the maximum uplift position is located at the center of the chamber bottom. The maximum shear force and bending moment of tunnel lining structure in the construction process are located at the arch shoulder and arch crown of the tunnel respectively. The deformation and stress characteristics of this tunnel during construction obtained through simulation analysis can provide a certain reference for similar tunnel engineering design, construction, and preventive measures.

Key words: Tunnel Engineering, Numerical Simulation, Midas GTS, Deformation and Stress Analyses