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Investigating the influence of excavating a tunnel undercrossing an existing tunnel at zero distance

Author

Listed:
  • Qiang Xu
  • Shengxiang Lei
  • Yongquan Zhu
  • Zhichun Liu
  • Zhenbo Zhang
  • Dapeng Wang
  • Kaimeng Ma
  • Xiaodong Liu

Abstract

In urban areas with limited underground space, the new tunnel construction introduces additional loads and displacements to existing tunnels, raising serious safety concerns. These concerns become particularly pronounced in the case of closely undercrossing excavation at zero-distance. The conventional elastic foundation beam model, which assumes constant reaction coefficients for the subgrade, fails to account for foundation loss. In this study, the existing tunnel is modeled as an Euler-Bernoulli beam supported by the Pasternak elastic foundation, and the foundation loss caused by zero-distance undercrossing excavations is considered. Furthermore, an analytical solution is proposed to evaluate the mechanical response in segments, by establishing governing differential equations and boundary conditions for the excavation and neutral zones, and underpinning loads are also considered. The analytical solution is validated in two case studies. Finally, a parametric analysis is performed to explore the influence of various parameters on the mechanical response of the existing tunnel.

Suggested Citation

  • Qiang Xu & Shengxiang Lei & Yongquan Zhu & Zhichun Liu & Zhenbo Zhang & Dapeng Wang & Kaimeng Ma & Xiaodong Liu, 2024. "Investigating the influence of excavating a tunnel undercrossing an existing tunnel at zero distance," PLOS ONE, Public Library of Science, vol. 19(4), pages 1-28, April.
    • Handle: RePEc:plo:pone00:0301428
    DOI: 10.1371/journal.pone.0301428
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    Cited by:

    1. Xuening Rong & Lirong Gao & Chaoling Ji & Aimin Han & Hailong Liu & Songtong Han, 2024. "Surface settlement induced by frictional force of epb shield tunneling in sandy gravels," PLOS ONE, Public Library of Science, vol. 19(9), pages 1-17, September.

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