Analysis of the Impact of Large-section Rectangular Pipe Jacking Construction on Adjacent High-voltage Power Towers

To assess the impact of large-section rectangular pipe jacking construction on the surrounding environment, this study focuses on the effects of construction on the safety of adjacent high-voltage transmission towers, using a power corridor pipe jacking project in Guangzhou as the research background. A three-dimensional computational model was established using finite element analysis software to investigate the influence of the entire pipe jacking process on nearby existing high-voltage transmission towers, with a comprehensive analysis of surface settlement and tower displacement characteristics. The findings indicate: (1) The surface settlement deformation caused by pipe jacking ranges from 23.5 mm to 28.1 mm, exhibiting significant concentration, primarily distributed within 2.5 times the length of the power corridor and gradually decreasing from the vertical axis of the corridor toward both sides. (2) The maximum horizontal displacement of the high-voltage transmission tower was calculated to be 17.8 mm, occurring at the tower top, while the minimum horizontal displacement was 3.6 mm, observed at the tower base. Combining these two displacement values with the tower height, the overall inclination of the tower was determined to be 0.028%, which is less than the 1% limit specified by standards, meeting regulatory requirements. In summary, pipe jacking construction exerts a certain degree of disturbance on the tower structure, but the impact is minimal and does not exceed the safety threshold permitted by the tower's structural design. After evaluation, the tower structure is found to be in a safe and controllable state overall. The results of this study can provide technical references for similar projects.