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Determination of Safety Distance of Twin Tunnel Underpassing Existing Tunnels

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Advances in Environmental Vibration and Transportation Geodynamics

Part of the book series: Lecture Notes in Civil Engineering ((LNCE,volume 66))

Abstract

New tunnel underpassing the existing tunnel construction forms a complex stress-coupling zone above it, causing uneven settlement. In order to ensure the safety of existing tunnels, it is necessary to determine the minimum safe construction distance for tunnels that pass through existing tunnels. Based on this, the FLAC3D finite difference method is used to construct a three-dimensional numerical model of the new tunnel that is orthogonal to the existing tunnel. The effect of different surrounding rock conditions on the settlement of the existing tunnel structure is discussed. Effect of different surrounding rock conditions on the settlement of the existing tunnel structure is discussed. It is determined that the new tunnel underpass different surrounding rock conditions. There is a minimum safe construction distance for the tunnel. On this basis, the effect of grouting reinforcement on the settlement of existing tunnels under the soft and broken surrounding rock is given. The results of the study can be used to determine the safety distance for the construction of a similarly built tunnel that is orthogonal to the existing tunnel.

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Author information

Authors and Affiliations

  1. School of Civil Engineering, Central South University, Changsha, 410075, Hunan, China

    Helin Fu, Pengtao An, Zhen Huang, Jiabing Zhang, Yue Shi & Guojing Yao

  2. National Engineering Laboratory for Construction Technology of High-Speed Railway, Central South University, Changsha, 410075, Hunan, China

    Helin Fu, Pengtao An, Zhen Huang, Jiabing Zhang, Yue Shi & Guojing Yao

Authors
  1. Helin Fu
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  2. Pengtao An
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  3. Zhen Huang
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  4. Jiabing Zhang
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  5. Yue Shi
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  6. Guojing Yao
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Corresponding author

Correspondence to Pengtao An .

Editor information

Editors and Affiliations

  1. Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA

    Erol Tutumluer

  2. School of Civil Engineering, Central South University, Changsha, Hunan, China

    Xiaobin Chen

  3. School of Civil Engineering, Central South University, Changsha, Hunan, China

    Yuanjie Xiao

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Fu, H., An, P., Huang, Z., Zhang, J., Shi, Y., Yao, G. (2020). Determination of Safety Distance of Twin Tunnel Underpassing Existing Tunnels. In: Tutumluer, E., Chen, X., Xiao, Y. (eds) Advances in Environmental Vibration and Transportation Geodynamics. Lecture Notes in Civil Engineering, vol 66. Springer, Singapore. https://doi.org/10.1007/978-981-15-2349-6_55

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  • DOI: https://doi.org/10.1007/978-981-15-2349-6_55

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  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-15-2348-9

  • Online ISBN: 978-981-15-2349-6

  • eBook Packages: EngineeringEngineering (R0)

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