Soil Deformation Investigation of a Piled-Raft Foundation Pit Under-Crossed by a Super-Large Diameter Shield Tunnel

In recent years, there has been a rise in the construction of expansive underground structures and shield tunnels with exceptionally large diameters. These projects introduce unique challenges regarding their impact on the surrounding soil and structures, which differ from those typically encountere...

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Main Authors: Yue Jiang, Yanlin Li, Aijun Yao, Xiangzhi Gao, Hui Li
Format: Article
Language:English
Published: MDPI AG 2023-05-01
Series:Applied Sciences
Subjects:
Online Access:https://www.mdpi.com/2076-3417/13/9/5774
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author Yue Jiang
Yanlin Li
Aijun Yao
Xiangzhi Gao
Hui Li
author_facet Yue Jiang
Yanlin Li
Aijun Yao
Xiangzhi Gao
Hui Li
author_sort Yue Jiang
collection DOAJ
description In recent years, there has been a rise in the construction of expansive underground structures and shield tunnels with exceptionally large diameters. These projects introduce unique challenges regarding their impact on the surrounding soil and structures, which differ from those typically encountered in conventional shield tunnels. However, the existing body of research in this specific domain remains insufficient. When such tunnels intersect deep foundation pits supported by piled-raft foundations, the discrepancies in soil deformation can become even more pronounced. At present, there is a dearth of research on the underlying principles governing these differences, and theoretical investigations have not kept pace with practical engineering applications. Consequently, the existing settlement prediction methods employed for diverse projects need to be reevaluated and adjusted to accommodate the distinctive characteristics of each individual project. Regarding the engineering focus of this paper, it is crucial to recognize that soil subsidence in the pit bottom has a significant influence on the mechanical response of the piles. Consequently, the implementation of targeted correction measures remains consistently important. Based on this concept, this paper focuses on a super-large diameter shield tunnel project that under-crossed a deep foundation pit with a piled-raft foundation. The influence of different construction methods on the settlement law of the soil at the bottom of the deep foundation pit is discussed after verification of the accuracy of the model through numerical simulation and field monitoring data. Additionally, two correction coefficients that consider the project’s load characteristics are proposed in this research. These coefficients were used to correct the surface settlement curve. The corrected soil settlement curve at the pit’s bottom can successfully reflect the numerical simulation results, which in turn can reflect the mechanical response of the pile under the influence of tunnel excavation.
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spelling doaj.art-0324f7819dd74cb0952bf00e42727cca2023-11-17T22:38:37ZengMDPI AGApplied Sciences2076-34172023-05-01139577410.3390/app13095774Soil Deformation Investigation of a Piled-Raft Foundation Pit Under-Crossed by a Super-Large Diameter Shield TunnelYue Jiang0Yanlin Li1Aijun Yao2Xiangzhi Gao3Hui Li4Beijing City Sub-Centre Station Integrated Hub Construction Management Company, Beijing 101100, ChinaThe Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education Beijing University of Technology, Beijing 100124, ChinaThe Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education Beijing University of Technology, Beijing 100124, ChinaThe Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education Beijing University of Technology, Beijing 100124, ChinaThe Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education Beijing University of Technology, Beijing 100124, ChinaIn recent years, there has been a rise in the construction of expansive underground structures and shield tunnels with exceptionally large diameters. These projects introduce unique challenges regarding their impact on the surrounding soil and structures, which differ from those typically encountered in conventional shield tunnels. However, the existing body of research in this specific domain remains insufficient. When such tunnels intersect deep foundation pits supported by piled-raft foundations, the discrepancies in soil deformation can become even more pronounced. At present, there is a dearth of research on the underlying principles governing these differences, and theoretical investigations have not kept pace with practical engineering applications. Consequently, the existing settlement prediction methods employed for diverse projects need to be reevaluated and adjusted to accommodate the distinctive characteristics of each individual project. Regarding the engineering focus of this paper, it is crucial to recognize that soil subsidence in the pit bottom has a significant influence on the mechanical response of the piles. Consequently, the implementation of targeted correction measures remains consistently important. Based on this concept, this paper focuses on a super-large diameter shield tunnel project that under-crossed a deep foundation pit with a piled-raft foundation. The influence of different construction methods on the settlement law of the soil at the bottom of the deep foundation pit is discussed after verification of the accuracy of the model through numerical simulation and field monitoring data. Additionally, two correction coefficients that consider the project’s load characteristics are proposed in this research. These coefficients were used to correct the surface settlement curve. The corrected soil settlement curve at the pit’s bottom can successfully reflect the numerical simulation results, which in turn can reflect the mechanical response of the pile under the influence of tunnel excavation.https://www.mdpi.com/2076-3417/13/9/5774super-large diameter shield tunneldeep foundation pitengineering geologyground subsidence predictionpiled-raft foundation
spellingShingle Yue Jiang
Yanlin Li
Aijun Yao
Xiangzhi Gao
Hui Li
Soil Deformation Investigation of a Piled-Raft Foundation Pit Under-Crossed by a Super-Large Diameter Shield Tunnel
Applied Sciences
super-large diameter shield tunnel
deep foundation pit
engineering geology
ground subsidence prediction
piled-raft foundation
title Soil Deformation Investigation of a Piled-Raft Foundation Pit Under-Crossed by a Super-Large Diameter Shield Tunnel
title_full Soil Deformation Investigation of a Piled-Raft Foundation Pit Under-Crossed by a Super-Large Diameter Shield Tunnel
title_fullStr Soil Deformation Investigation of a Piled-Raft Foundation Pit Under-Crossed by a Super-Large Diameter Shield Tunnel
title_full_unstemmed Soil Deformation Investigation of a Piled-Raft Foundation Pit Under-Crossed by a Super-Large Diameter Shield Tunnel
title_short Soil Deformation Investigation of a Piled-Raft Foundation Pit Under-Crossed by a Super-Large Diameter Shield Tunnel
title_sort soil deformation investigation of a piled raft foundation pit under crossed by a super large diameter shield tunnel
topic super-large diameter shield tunnel
deep foundation pit
engineering geology
ground subsidence prediction
piled-raft foundation
url https://www.mdpi.com/2076-3417/13/9/5774
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