With the continuous acceleration of urban underground space development

deep foundation pit engineering has become increasingly common

and the impact of foundation pit excavation on the safety of surrounding pile foundation structures has attracted growing attention. Based on an actual project

this paper uses finite element software to simulate the stress and deformation laws of pipe piles inside the pit during deep foundation pit excavation

and explores the evolution characteristics of their bearing performance. By setting multiple working conditions

the action mechanisms of factors such as foundation pit depth

support method

and soil layer properties on pile top displacement

axial force distribution

and pile body settlement are discussed. The results show that the unloading effect caused by foundation pit excavation significantly changes the bearing behavior of pipe piles

the pile-soil interaction mechanism is adjusted

and the downward movement of the neutral point is prominent. The research results can provide a reference for the design and construction of similar projects.