Impact Analysis of Deep Foundation Pit Construction on Deformation of Adjacent Buildings

Combined with a foundation pit project in Kunming, numerical modeling was established using finite element software MIDAS GTS. Three numerical simulations were carried out on the surface settlement of the foundation pit and deformation of the neighboring buildings, including no buildings in the surrounding, the longitudinal wall of the building parallelling to the foundation pit, and the longitudinal wall of the building being perpendicular to the foundation pit. The results show that: (1) the settlement of the floor plate of the neighboring building near the pit is larger, the building as a whole is tilted to the pit, and the two ends of the floor plate in the width direction are synchronously sinking and symmetrically concave, compared to the settlement of the building when the longitudinal wall is perpendicular to the pit, and (2) in the case of the no building or building with longitudinal wall parallel to the pit, the maximum settlement of the surface of the pit occurs in the range of 5~7.5 m from the edge of the pit, which is approximately (0.5~0.75)H (H is the depth of the pit); for the case where the longitudinal wall of the building is perpendicular to the pit, the maximum settlement of the surface of the pit occurs at a distance of about 9~12 m from the edge of the pit, which is about (0.9~1.2)H.