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February 21, 2026Underground SpaceOpen Access

Incomplete soil arching effect and responses of existing tunnels induced by undercrossing super-large-diameter shield tunneling in soft strata

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Authors

YCYuyang CaoXXXiongyao XieKZKun Zeng

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Overview

This research investigates ground deformation responses from super-large-diameter tunneling in soft strata, suggesting improvements for existing tunnel stability.

Key Points

  • The research aims to understand the interactions and deformations caused by super-large-diameter shield tunneling on existing tunnels in soft soil strata.
  • Developed and validated a numerical model to simulate ground-tunnel interactions
  • Focused on stress and displacement responses during the undercrossing of an existing tunnel
  • Conducted parametric analyses to evaluate effects of tunnel spacing and volume loss ratios
  • Identified incomplete soil arching effect and categorized influenced areas into reinforced, stable, and safe zones
  • Greater volume loss ratios and smaller tunnel spacings lead to increased ground settlement
  • Optimal volume loss ratio of 0.2% minimizes loosened zone height
  • Changes in existing tunnel convergence occur in two distinct phases based on tunnel spacing relative to the new tunnel diameter
  • Recommended maintaining volume loss ratio below 0.2% and tunnel spacing over 0.3D to mitigate adverse effects

Cite This Study

Cao et al. (2026) studied this question.

synapsesocial.com/papers/69994aab873532290d01f103https://doi.org/10.1016/j.undsp.2025.04.013
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Analysis of the influence of new tunnel excavation on the stability of adjacent existing tunnels2026
  2. 2Analysis of the Coupled Deformation Pattern of Existing Underground Structural Clusters Due to Undercrossing by a Super-Large-Diameter Shield Tunnel2026
  3. 3Large-diameter shield tunnel crossing closely to existing metro tunnels and a residential building: A case study2024
  4. 4Impact of small-angle shield undercrossing on existing tunnels2024
  5. 5Study of Factors Influencing the Longitudinal Mechanical Performance of Shield Tunnels Traversing Soft–Hard Heterogeneous Soils2025