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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MDPI AG
2023-05-01
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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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institution | Directory Open Access Journal |
issn | 2076-3417 |
language | English |
last_indexed | 2024-03-11T04:22:49Z |
publishDate | 2023-05-01 |
publisher | MDPI AG |
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series | Applied Sciences |
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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