Numerical Simulation Study on the Impact of Deep Foundation Pit Excavation on Adjacent Rail Transit Structures—A Case Study

Junzhou Huang; Jizhixian Liu; Kai Guo; Cai Wu; Shan Yang; Mingxing Luo; Yani Lu

doi:10.3390/buildings14061853

Buildings (Jun 2024)

Numerical Simulation Study on the Impact of Deep Foundation Pit Excavation on Adjacent Rail Transit Structures—A Case Study

Junzhou Huang,
Jizhixian Liu,
Kai Guo,
Cai Wu,
Shan Yang,
Mingxing Luo,
Yani Lu

Affiliations

Junzhou Huang: School of Civil Engineering, Hubei Engineering University, Xiaogan 432000, China
Jizhixian Liu: School of Civil Engineering, Hubei Engineering University, Xiaogan 432000, China
Kai Guo: Wuhan Municipal Engineering Design & Research Institute Co., Ltd., Wuhan 430023, China
Cai Wu: School of Civil Engineering, Hubei Engineering University, Xiaogan 432000, China
Shan Yang: China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, China
Mingxing Luo: School of Civil Engineering, Hubei Engineering University, Xiaogan 432000, China
Yani Lu: School of Civil Engineering, Hubei Engineering University, Xiaogan 432000, China

DOI: https://doi.org/10.3390/buildings14061853
Journal volume & issue: Vol. 14, no. 6
p. 1853

Abstract

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Excavation in foundation pits can result in serious issues for nearby tunnel structures like deformation, differential settlement, and seepage damage, which profoundly impact project timelines and potentially endanger life and property safety. Therefore, it is imperative to investigate these impacts before and after construction and to facilitate timely adjustments of construction measures and reinforcement where possible. In this study, a foundation pit construction project near a rail transit line is employed as a case to comprehensive study the impact of on-site deep foundation pit excavation on adjacent rail transit structures by numerical simulation. A three-dimensional finite-element model of the foundation pit based on site geological characteristics and construction procedures is established to study the excavation and maintenance processes. Through analysis of key parameters including soil deformation, displacement, shear force, and bending moment of the tunnel structures, the designed protective structure is found to have effectively mitigated soil deformation, ensuring the stability of the foundation pit. As excavation progresses, lateral soil deformation and vertical uplift gradually increase but remain within specified control values. During various excavation stages, the maximum displacement of the tunnel structure gradually increases, with the increase rates of maximum settlement being 29.09%, 20.51%, and 6.45%, respectively. This indicates a gradual enhancement of the stability of the tunnel structure. Additionally, excavation of the foundation pit has a significant impact on the bending moment distribution of the tunnel structure but does not affect the axial force and shear force of the tunnel structure. The findings of this study offer crucial scientific insights for evaluating the safety and stability of construction near tunnel structures.

Published in Buildings

ISSN: 2075-5309 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Building construction
Website: https://www.mdpi.com/journal/buildings

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