Research on the Application of Cushion and Isolation Materials in Protecting the over Shield Tunnel

Gu Wentian; Zhao Qijia; Lu Yuan

doi:doi:10.11648/j.jccee.20240904.14

Research Article |

| Peer-Reviewed

Research on the Application of Cushion and Isolation Materials in Protecting the over Shield Tunnel

Gu Wentian^*

, Zhao Qijia

, Lu Yuan

Published in Journal of Civil, Construction and Environmental Engineering (Volume 9, Issue 4)

Received: 21 June 2024 Accepted: 20 August 2024 Published: 27 August 2024

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Abstract

The portal frame, as an innovative subway protection structure, primarily serves the development of underground spaces above shield tunneling for subways. It comprises foundation piles along both sides of the tunnel and a transition thick plate. When the transfer thick plate sustains loads at its midspan, deformation occurs, interacting with the underlying soil to generate additional stresses, thereby potentially impacting the subway tunnel beneath negatively. This study, anchored in the real-case scenario of Qianhai Exchange Square, employs finite element analysis to investigate the interaction mechanisms between the transfer thick plate under midspan loading and soils of varying properties. Findings revealed a characteristic distribution pattern of additional stresses in the soil—smaller at the edges and larger at the center. Furthermore, under equal loading conditions, there's a positive correlation between soil stiffness and induced additional stress, while an inverse relationship exists with the vertical deformation of the transfer thick plate. In response to this issue, the paper innovatively proposes embedding a cushioning and isolation layer under the transfer thick plate. Based on the results of full-scale tunnel tests carried out during the early stages of the project, and by employing high-precision finite element simulations, the bearing capacity of the tunnel was determined. This analysis, in turn, informed the formulation of selection principles for the cushioning and isolation materials in a feedback manner. Computational verifications showed that appropriately designing the cushioning and isolation layer can significantly reduce additional stresses in the foundation soil, thereby effectively alleviating the impact of concentrated upper loads on the shield tunnel.

Published in	Journal of Civil, Construction and Environmental Engineering (Volume 9, Issue 4)
DOI	10.11648/j.jccee.20240904.14
Page(s)	122-130
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Subway, Portal Frame, Experimental Study, Numerical Calculation, Isolation Material, Over-Crossing Shield Tunnel

References

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[2]	Wei Gang. Measurement and Analysis of the Influence of Excavation Pit on the Existing Shield Tunnel Below [J]. Rock and Soil Mechanics, 2013, 34(5): 8-14. https://doi.org/10.13393/j.cnki.issn.1672-948X.2013.05.008
[3]	Wen Sulin. Control Techniques for Open Excavation Construction of Foundation Pit Crossing Operative Metro Tunnels at Close Proximity [C]. //Collected Papers of the 2010 Academic Annual Conference of the Geotechnical Engineering Branch of the Architectural Society of China. 2010: 451-454.
[4]	Chen Juan, Shen Bihui, Peng Jiangqiang. Analysis of Protection Measures for Foundation Pits Spanning Across Subway Interval Tunnels [C]. //Proceedings of the 2014 China Tunnel and Underground Engineering Conference (CTUC) & the 18th Annual Conference of the Tunnelling and Underground Works Division of the China Civil Engineering Society. 2014: 328-332.
[5]	Guo Jun, Wen Jiaming, Gu Wentian, et al. Underground Space Development Technology above Shield Tunnels [J]. Railway Construction, 2020, 60(7): 64-68. https://doi.org/10.3969/j.issn.1003-1995.2020.07.16
[6]	Cheng XZ. Research on Deformation Control of Subway Shield Tunnel Passing Under Existing Railway [J]. Modern Urban Rail Transit, 2012, 6(6): 4. https://doi.org/10.3969/j.issn.1672-7533.2012.06.014
[7]	He Xiaolong, Dong Haowei, Chen Yanqing, et al. Monitoring and Numerical Analysis of the Deformation Effects of Excavation above Subway Tunnels on the Interval Tunnels [J]. Journal of Hydraulic Engineering and Architecture, 2019, 17(4): 39-44. https://doi.org/10.3969/j.issn.1672-1144.2019.04.007
[8]	Gao Q, Yu WL. Analysis of the Impact of Municipal Tunnel Excavation Pit on the Existing Subway Shield Tunnel [J]. Tunnel Construction, 2014, 34(4): 7-12. https://doi.org/10.3973/j.issn.1672-741X.2014.04.004
[9]	Tian Shuai. Research on Protection Scheme for Foundation Pit Crossing Operational Subway Tunnels under Complex Conditions [J]. Tunnel Construction (English Edition), 2020, 40(S2): 196-203. https://doi.org/10.3973/j.issn.2096-4498.2020.S2.025
[10]	Liu Jianhang, Hou Xueyuan. Analysis of Internal Forces in Retaining Structures. In: Manual of Foundation Pit Engineering, 1st Edition. Beijing: China Architecture & Building Press; 1997, pp. 139-144.
[11]	Wang Kangren, Pang Xiaozhao, Liu Shuya, et al. Research on Load-bearing Performance and Structural Safety Indices of Segmented Shield Tunnels with Offset Joints under Complex Loading Conditions [J]. Modern Tunnelling Technology, 2018, 55(S2): 588-598. https://doi.org/10.13807/j.cnki.mtt.2018.S2.076
[12]	Liu Xuezeng, Cai Guangyuan, Yang Fan, et al. Structural Load-Carrying Performance and Deformation Control Indicators of Shield Tunnel with Mosaic Assembled in Fractured Surrounding Rock [J]. China Journal of Highway and Transport, 2017, 30(8): 9-15. https://doi.org/10.3969/j.issn.1001-7372.2017.08.006
[13]	Wang Shimin, Shen Xingzhu, He Xiangfan, et al. Experimental Study on Force and Failure Mode of Shield Tunnel Lining under Different Assembly Methods [J]. Journal of Civil Engineering, 2017, 50(6): 11-18. https://doi.org/CNKI:SUN:TMGC.0.2017-06-013
[14]	Liu Zhao. Experimental and Simulation Analysis of the Deformation Performance of Shield Tunnel Lining with Mosaic Assembly under Complex Working Conditions [D]. China Academy of Railway Science, 2017.
[15]	Fan Yiming, Li Bo, Liu Bo. Analysis of Force and Deformation of Extra-Large Diameter Shield Tunnel Lining Considering Different Segment Assembly Methods [J]. Journal of Anhui University of Architecture, 2021. https://doi.org/10.11921/j.issn.2095-8382.20210103

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APA Style

Wentian, G., Qijia, Z., Yuan, L. (2024). Research on the Application of Cushion and Isolation Materials in Protecting the over Shield Tunnel. Journal of Civil, Construction and Environmental Engineering, 9(4), 122-130. https://doi.org/10.11648/j.jccee.20240904.14

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ACS Style

Wentian, G.; Qijia, Z.; Yuan, L. Research on the Application of Cushion and Isolation Materials in Protecting the over Shield Tunnel. J. Civ. Constr. Environ. Eng. 2024, 9(4), 122-130. doi: 10.11648/j.jccee.20240904.14

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AMA Style

Wentian G, Qijia Z, Yuan L. Research on the Application of Cushion and Isolation Materials in Protecting the over Shield Tunnel. J Civ Constr Environ Eng. 2024;9(4):122-130. doi: 10.11648/j.jccee.20240904.14

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@article{10.11648/j.jccee.20240904.14,
  author = {Gu Wentian and Zhao Qijia and Lu Yuan},
  title = {Research on the Application of Cushion and Isolation Materials in Protecting the over Shield Tunnel
},
  journal = {Journal of Civil, Construction and Environmental Engineering},
  volume = {9},
  number = {4},
  pages = {122-130},
  doi = {10.11648/j.jccee.20240904.14},
  url = {https://doi.org/10.11648/j.jccee.20240904.14},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jccee.20240904.14},
  abstract = {The portal frame, as an innovative subway protection structure, primarily serves the development of underground spaces above shield tunneling for subways. It comprises foundation piles along both sides of the tunnel and a transition thick plate. When the transfer thick plate sustains loads at its midspan, deformation occurs, interacting with the underlying soil to generate additional stresses, thereby potentially impacting the subway tunnel beneath negatively. This study, anchored in the real-case scenario of Qianhai Exchange Square, employs finite element analysis to investigate the interaction mechanisms between the transfer thick plate under midspan loading and soils of varying properties. Findings revealed a characteristic distribution pattern of additional stresses in the soil—smaller at the edges and larger at the center. Furthermore, under equal loading conditions, there's a positive correlation between soil stiffness and induced additional stress, while an inverse relationship exists with the vertical deformation of the transfer thick plate. In response to this issue, the paper innovatively proposes embedding a cushioning and isolation layer under the transfer thick plate. Based on the results of full-scale tunnel tests carried out during the early stages of the project, and by employing high-precision finite element simulations, the bearing capacity of the tunnel was determined. This analysis, in turn, informed the formulation of selection principles for the cushioning and isolation materials in a feedback manner. Computational verifications showed that appropriately designing the cushioning and isolation layer can significantly reduce additional stresses in the foundation soil, thereby effectively alleviating the impact of concentrated upper loads on the shield tunnel.
},
 year = {2024}
}

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TY  - JOUR
T1  - Research on the Application of Cushion and Isolation Materials in Protecting the over Shield Tunnel

AU  - Gu Wentian
AU  - Zhao Qijia
AU  - Lu Yuan
Y1  - 2024/08/27
PY  - 2024
N1  - https://doi.org/10.11648/j.jccee.20240904.14
DO  - 10.11648/j.jccee.20240904.14
T2  - Journal of Civil, Construction and Environmental Engineering
JF  - Journal of Civil, Construction and Environmental Engineering
JO  - Journal of Civil, Construction and Environmental Engineering
SP  - 122
EP  - 130
PB  - Science Publishing Group
SN  - 2637-3890
UR  - https://doi.org/10.11648/j.jccee.20240904.14
AB  - The portal frame, as an innovative subway protection structure, primarily serves the development of underground spaces above shield tunneling for subways. It comprises foundation piles along both sides of the tunnel and a transition thick plate. When the transfer thick plate sustains loads at its midspan, deformation occurs, interacting with the underlying soil to generate additional stresses, thereby potentially impacting the subway tunnel beneath negatively. This study, anchored in the real-case scenario of Qianhai Exchange Square, employs finite element analysis to investigate the interaction mechanisms between the transfer thick plate under midspan loading and soils of varying properties. Findings revealed a characteristic distribution pattern of additional stresses in the soil—smaller at the edges and larger at the center. Furthermore, under equal loading conditions, there's a positive correlation between soil stiffness and induced additional stress, while an inverse relationship exists with the vertical deformation of the transfer thick plate. In response to this issue, the paper innovatively proposes embedding a cushioning and isolation layer under the transfer thick plate. Based on the results of full-scale tunnel tests carried out during the early stages of the project, and by employing high-precision finite element simulations, the bearing capacity of the tunnel was determined. This analysis, in turn, informed the formulation of selection principles for the cushioning and isolation materials in a feedback manner. Computational verifications showed that appropriately designing the cushioning and isolation layer can significantly reduce additional stresses in the foundation soil, thereby effectively alleviating the impact of concentrated upper loads on the shield tunnel.

VL  - 9
IS  - 4
ER  -

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Author Information

Gu Wentian

China Academy of Railway Sciences (Shenzhen) Research and Design Institute Co. Ltd., Shenzhen, China

Contact Email

http://orcid.org/0009-0000-5153-8554
Zhao Qijia

Shenzhen Qianhai Investment Holding, Shenzhen, China

http://orcid.org/0009-0003-5579-3386
Lu Yuan

China Academy of Railway Sciences (Shenzhen) Research and Design Institute Co. Ltd., Shenzhen, China

http://orcid.org/0009-0002-8161-2772

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Plain Text BibTeX RIS

APA Style

Wentian, G., Qijia, Z., Yuan, L. (2024). Research on the Application of Cushion and Isolation Materials in Protecting the over Shield Tunnel. Journal of Civil, Construction and Environmental Engineering, 9(4), 122-130. https://doi.org/10.11648/j.jccee.20240904.14

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ACS Style

Wentian, G.; Qijia, Z.; Yuan, L. Research on the Application of Cushion and Isolation Materials in Protecting the over Shield Tunnel. J. Civ. Constr. Environ. Eng. 2024, 9(4), 122-130. doi: 10.11648/j.jccee.20240904.14

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AMA Style

Wentian G, Qijia Z, Yuan L. Research on the Application of Cushion and Isolation Materials in Protecting the over Shield Tunnel. J Civ Constr Environ Eng. 2024;9(4):122-130. doi: 10.11648/j.jccee.20240904.14

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@article{10.11648/j.jccee.20240904.14,
  author = {Gu Wentian and Zhao Qijia and Lu Yuan},
  title = {Research on the Application of Cushion and Isolation Materials in Protecting the over Shield Tunnel
},
  journal = {Journal of Civil, Construction and Environmental Engineering},
  volume = {9},
  number = {4},
  pages = {122-130},
  doi = {10.11648/j.jccee.20240904.14},
  url = {https://doi.org/10.11648/j.jccee.20240904.14},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jccee.20240904.14},
  abstract = {The portal frame, as an innovative subway protection structure, primarily serves the development of underground spaces above shield tunneling for subways. It comprises foundation piles along both sides of the tunnel and a transition thick plate. When the transfer thick plate sustains loads at its midspan, deformation occurs, interacting with the underlying soil to generate additional stresses, thereby potentially impacting the subway tunnel beneath negatively. This study, anchored in the real-case scenario of Qianhai Exchange Square, employs finite element analysis to investigate the interaction mechanisms between the transfer thick plate under midspan loading and soils of varying properties. Findings revealed a characteristic distribution pattern of additional stresses in the soil—smaller at the edges and larger at the center. Furthermore, under equal loading conditions, there's a positive correlation between soil stiffness and induced additional stress, while an inverse relationship exists with the vertical deformation of the transfer thick plate. In response to this issue, the paper innovatively proposes embedding a cushioning and isolation layer under the transfer thick plate. Based on the results of full-scale tunnel tests carried out during the early stages of the project, and by employing high-precision finite element simulations, the bearing capacity of the tunnel was determined. This analysis, in turn, informed the formulation of selection principles for the cushioning and isolation materials in a feedback manner. Computational verifications showed that appropriately designing the cushioning and isolation layer can significantly reduce additional stresses in the foundation soil, thereby effectively alleviating the impact of concentrated upper loads on the shield tunnel.
},
 year = {2024}
}

Copy | Download

TY  - JOUR
T1  - Research on the Application of Cushion and Isolation Materials in Protecting the over Shield Tunnel

AU  - Gu Wentian
AU  - Zhao Qijia
AU  - Lu Yuan
Y1  - 2024/08/27
PY  - 2024
N1  - https://doi.org/10.11648/j.jccee.20240904.14
DO  - 10.11648/j.jccee.20240904.14
T2  - Journal of Civil, Construction and Environmental Engineering
JF  - Journal of Civil, Construction and Environmental Engineering
JO  - Journal of Civil, Construction and Environmental Engineering
SP  - 122
EP  - 130
PB  - Science Publishing Group
SN  - 2637-3890
UR  - https://doi.org/10.11648/j.jccee.20240904.14
AB  - The portal frame, as an innovative subway protection structure, primarily serves the development of underground spaces above shield tunneling for subways. It comprises foundation piles along both sides of the tunnel and a transition thick plate. When the transfer thick plate sustains loads at its midspan, deformation occurs, interacting with the underlying soil to generate additional stresses, thereby potentially impacting the subway tunnel beneath negatively. This study, anchored in the real-case scenario of Qianhai Exchange Square, employs finite element analysis to investigate the interaction mechanisms between the transfer thick plate under midspan loading and soils of varying properties. Findings revealed a characteristic distribution pattern of additional stresses in the soil—smaller at the edges and larger at the center. Furthermore, under equal loading conditions, there's a positive correlation between soil stiffness and induced additional stress, while an inverse relationship exists with the vertical deformation of the transfer thick plate. In response to this issue, the paper innovatively proposes embedding a cushioning and isolation layer under the transfer thick plate. Based on the results of full-scale tunnel tests carried out during the early stages of the project, and by employing high-precision finite element simulations, the bearing capacity of the tunnel was determined. This analysis, in turn, informed the formulation of selection principles for the cushioning and isolation materials in a feedback manner. Computational verifications showed that appropriately designing the cushioning and isolation layer can significantly reduce additional stresses in the foundation soil, thereby effectively alleviating the impact of concentrated upper loads on the shield tunnel.

VL  - 9
IS  - 4
ER  -

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