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Open Access

Study on Additional Stress of Adjacent Tunnel Caused by Excavation of Foundation Pit Group

Zihan Liu1, Hongqian Wang1, Kai Zhang2,3, Xifei Deng4, Jianbo Zhu2,3( )
Faculty of Architectural Engineering, Tianjin University, Tianjin 300354, P. R. China
Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization, Shenzhen, Gugdong 518060, P. R. China
Institute of Deep Earth Sciences and Green Energy, Shenzhen University, Shenzhen, Guangdong 518060, P. R. China
Urban Rail Transit Engineering Branch Company, China Tiesiju Civil Engineering Group, Hefei 230023, P. R. China
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Abstract

Excavation unloading of foundation pit will lead to additional stress in adjacent subway tunnels. Excessive additional stress will cause instability of subway tunnel, and then affect the safety of subway operation. In order to study the influence law of additional stress on tunnels, the calculation formula of tunnel additional stress caused by foundation pit excavation is derived by using Mindlin theoretical solution and is verified based on the excavation project of a foundation pit group near a subway tunnel in Hangzhou. Then, the influence of three factors, including tunnel depth, horizontal distance between tunnel and foundation pit, and angle between tunnel and foundation pit, on additional stress in tunnel is analyzed. The research results show that: (1) with the increase of tunnel depth, the vertical additional stress of tunnel increase while the horizontal additional stress decrease, and the vertical and horizontal additional stress will decrease with the increase of the horizontal distance between tunnel axis and foundation pit; (2) during excavation of foundation pits, with the increase of horizontal distance between tunnel and foundation pit, the influence coefficient of tunnel depth on vertical additional stress decreases gradually, while the influence coefficient of tunnel depth on horizontal additional stress decreases first and then increases; (3) the vertical and horizontal additional stresses increase with the increase of the angle between tunnel axis and foundation axis, and the additional stress of the tunnel is mainly caused by excavation of the foundation pit which is the closest; (4) with the increase of the distance between tunnel axis and foundation pit axis, the reduction rate of vertical additional stress caused by pit group excavation is smaller than that caused by single pit excavation, while the reduction rate of horizontal additional stress caused by pit group excavation is larger than that caused by single pit excavation.

Keywords

foundation pit grouptunneladditional stressMindlin theoretical solutionhazardous areas
CLC number: TU43 Document code: A Article ID: 1673-0836(2024)04-1298-11

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Chinese Journal of Underground Space and Engineering
Volume 20 Issue 4,
August 2024
Pages 1298-1308
DOI: 10.20174/j.JUSE.2024.04.23

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Cite this article:
Liu Z, Wang H, Zhang K, et al. Study on Additional Stress of Adjacent Tunnel Caused by Excavation of Foundation Pit Group. Chinese Journal of Underground Space and Engineering, 2024, 20(4): 1298-1308. https://doi.org/10.20174/j.JUSE.2024.04.23

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Received: 20 November 2023
Published: 01 August 2024
© 2024 Chinese Journal of Underground Space and Engineering

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).