Abstract: The deep foundation excavation would cause horizontal displacement and settlement of the adjacent high-voltage transmission line tower foundation. When designing deep excavation support systems, the deformation caused by excavation should be controlled within the allowable range. The excavation of a municipal pipe gallery foundation in Hefei is presented in this paper as an example. Three-dimensional finite element numerical simulation method was used to evaluate the deformation effect of deep excavation on the adjacent 220kV transmission line tower foundation. The deformation of the supporting structure and the tower foundation were obtained in the process of deep excavation. The numerical simulation results indicated that the closer the tower foundation was to the boundary of the excavation, the greater the horizontal displacement and settlement of the foundation. By comparing it with the monitoring data, it showed that the threedimensional finite element numerical simulation method was feasible to analyze the influence of deep excavation on the stability of the adjacent high-voltage transmission line tower foundation. It provided a scientific basis for determining a safe and reliable support system and could provide reference for similar projects.

Key words: Deep Excavation, Transmission Line, Tower Foundation, Numerical Simulation, Stability