Influence analysis of foundation pit construction of a subway station in Nanchang on shield tunnel and adjacent buildings

Abstract

Subway stations are mostly located in the downtown area with many buildings and underground traffic trunk lines with large traffic flow. During the construction of the subway station foundation pit, the excavation and unloading of the foundation pit will easily lead to the displacement of buildings on both sides and the surrounding strata, resulting in large surface settlement. Combined with the engineering example of a subway station in Nanchang, in order to ensure the safety of the surrounding environment in the construction process of the subway station foundation pit, this paper uses Midas GTS NS finite element software to carry out numerical simulation of the deep foundation pit excavation engineering and analyzes the influence of the subway station deep foundation pit construction on the surrounding buildings. The construction monitoring after foundation pit excavation shows that the theoretical calculation results are basically consistent with the measured data, which provides a reference for the design and construction of subway foundation pit engineering.