This paper aims to study the impact of deep excavation on neighboring buildings and evaluate its safety.Taking the deep foundation excavation project of a metro station in Xiamen City as an example

a three-dimensional finite element model was built.With the consideration of the small-strain stiffness behavior of soils and the interaction of the pit

the foundation base

the foundation and the superstructure

the deformation of neighboring buildings caused by deep foundation excavation was calculated.The deflection at the bottom of the column was exerted on superstructure as its forced displacement to calculate the structural internal force and check the reinforcement of components.Then

the safety of neighboring buildings was evaluated.Result shows that the closer the neighboring buildings are to the excavation

the greater the impact is.The deformation of neighboring buildings shows settlement and horizontal displacement to the foundation pit after excavation.The neighboring building structure inclines slightly to the foundation pit

with a maximum horizontal displacement of 6.6 mm occurring at the top of the building and decreasing gradually to the bottom.The structural settlement is the prominent response of the basement to the excavation.The affected distance is about 3 times of foundation depth from the support walls

and the severe settlement area is in the range about 1.5 times of foundation depth to the foundation support structure.The maximum settlement of the basement is 15.9 mm.Under the impact of neighboring foundation excavation

the internal force of the superstructure redistributes due to support dislocation

but the whole structure is testified to be safe and reliable.