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Research on subway shield tunnel induced by local water immersion of collapsible loess

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Abstract

There are an increasing number of cases wherein the soil around a tunnel is immersed in water, which adversely affects the tunnel. To study the influence mechanism of local immersion of loess stratum on metro shield tunnel in detail, a similarity model test and numerical simulation were used in this study. These were used to investigate the stress and deformation of tunnel lining and stratum and surface settlement after a local soil collapse in the tunnel, and the mechanical mechanism that causes this effect. Further, the influences of different methods of water immersion on the tunnel lining were studied using numerical simulation. The results showed that the larger the collapsing area, the larger the bending moment and the axial force increment of the tunnel lining and the surface settlement; the bending moment and axial force near the side of the collapsing area were larger than those of the non-wet side. Vertical stress in the collapsible area was reduced, while the vertical stress of the non-collapsible soil on both sides of the collapsible area was increased due to the transmission of stress. When the water immersion area was the same, different water immersion methods also made the internal force of the tunnel lining slightly different; however, the difference was not obvious.

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The authors declare that all the data in the manuscript are obtained through the model experiment or the numerical simulation, and these data are real and valid.

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There has been no significant financial support for this work that could have influenced its outcome.

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Authors and Affiliations

  1. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University, Xi’an, 710064, China

    Xiaolin Weng, Rongming Zhou, Wei Rao & Deng Wang

Authors
  1. Xiaolin Weng
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  2. Rongming Zhou
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  3. Wei Rao
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  4. Deng Wang
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Contributions

XW was involved in writing—original draft and data curation. RZ was involved in software and methodology. WR was involved in model test. DW was involved in supervision.

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Correspondence to Rongming Zhou.

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The authors wish to confirm that there are no known conflicts of interest associated with this publication. And the authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest or non-financial interest in the subject matter or materials discussed in this manuscript.

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Weng, X., Zhou, R., Rao, W. et al. Research on subway shield tunnel induced by local water immersion of collapsible loess. Nat Hazards 108, 1197–1219 (2021). https://doi.org/10.1007/s11069-021-04727-4

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  • DOI: https://doi.org/10.1007/s11069-021-04727-4

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