Monitoring and finite element analysis of deep horizontal displacement of foundation pit enclosure pile of a subway transfer station during construction

Abstract

Based on the foundation pit construction of a subway transfer station, this article focuses on studying the deep horizontal displacement and deformation law of retaining piles during foundation pit excavation, so as to accurately evaluate the safety state of foundation pit excavation. Therefore, a deformation monitoring for the deep horizontal displacement of the foundation pit pile during the whole construction process, and the excavation process is numerically simulated by using finite element analysis. The findings show that when the foundation pit keeps working down, the position of the maximum deep horizontal displacement of the pile also keeps moving down when the foundation pit is excavated to the design height, the deformation curve of the deep horizontal displacement of the pile along the pile depth presents the characteristics of "big belly". At this time, the maximum deep horizontal displacement mostly appears in the middle and lower parts of the pile. The measured maximum deep horizontal displacement value of each pile body did not exceed the limit value, indicating that the foundation pit excavation is in a safe state during the construction process.