Study on the Influence of Foundation Pit Excavation on the Deformation of Adjacent Subway Tunnel in the Affected Area of Fault Zones

Yungang Niu, Qiongyi Wang and Fenghai Ma ()
Additional contact information
Yungang Niu: College of Architecture and Engineering, Dalian University, Dalian 116622, China
Qiongyi Wang: School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, China
Fenghai Ma: College of Architecture and Engineering, Dalian University, Dalian 116622, China

Sustainability, 2023, vol. 15, issue 12, 1-20

Abstract: In order to understand and mitigate the deformation issues caused by the excavation of foundation pits within the influence area of fault zones, ensuring the safety of the subway system and supporting the sustainable development of the city, this paper takes the foundation pit project near the Shenzhen Metro Line 5 in the F1322 fault zone influence area as the research background, and uses theoretical analysis, numerical simulation and on-site measurement and other research methods to carry out in-depth research on the deformation problems of the adjacent subway tunnel caused by the unloading of the foundation pit excavation. The research results demonstrate that by considering the collaborative deformation effect between retaining piles and excavation sidewall soil under the spatial impact of foundation pit excavation and using the Mindlin solution to calculate the additional stress on the sidewall and bottom of the foundation pit, a deformation calculation formula for the tunnel has been established. The impact characteristics of different geological parameter variations on the horizontal and vertical displacements of the tunnel have been analyzed. The sensitivity analysis of maximum tunnel displacement to different geological parameters reveals that the most sensitive factor is the elastic modulus, followed by the internal friction angle, while the cohesion has the least influence. By fitting the data, it has been found that the maximum deformation of the tunnel under composite strata excavation exhibits a good linear relationship with the index bH/L and a prediction formula for the maximum tunnel deformation under this geological condition has been developed. Therefore, the research findings of this study can be utilized to assess the impact of foundation pit excavation on the deformation of subway tunnels under similar geological conditions. They can also be employed to formulate construction monitoring plans and risk management strategies, contributing to the safety of subway systems and the sustainable development of cities.

Keywords: fault zone influence area; excavation of foundation pit; tunnel displacement; deformation calculation; sensitivity analysis; predictive formula (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2071-1050/15/12/9462/pdf (application/pdf)
https://www.mdpi.com/2071-1050/15/12/9462/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:15:y:2023:i:12:p:9462-:d:1169559

Access Statistics for this article

Sustainability is currently edited by Ms. Alexandra Wu

More articles in Sustainability from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().