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June 6, 2026Scientific ReportsOpen Access

Mechanical responses and probabilistic sensitivity analysis of shield tunnel segment in water-rich soft strata

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Authors

XCXi ChenLZLing ZhangDZDengheng Zheng

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Overview

Randomized trial analyzes segment behavior under changing groundwater levels, indicating key factors affecting tunnel integrity.

Key Points

  • This study aims to analyze the mechanical responses of shield tunnel segments in water-rich soft strata and identify key sensitive parameters.
  • Established a 2D hydro-mechanical coupling finite element model using ANSYS.
  • Conducted probabilistic sensitivity analysis with Monte Carlo method involving nine random variables and 10,000 cyclic samplings.
  • Assessed segment mechanical responses including pore water pressure, stress, and displacement under varied groundwater levels.
  • Groundwater level significantly affects segment behavior, with peak pore water pressure and stress positively correlated, while vertical deformation is negatively correlated.
  • The outer ring is vulnerable to tensile failure; crown and haunch areas are critical control points.
  • Surrounding rock density dominates axial forces, while lining thickness mainly influences bending moments.

Cite This Study

Chen et al. (2026) studied this question.

synapsesocial.com/papers/6a23b8c571a5da9775e74e96https://doi.org/10.1038/s41598-026-56509-2
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Also Consider

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  1. 1Mechanical Behavior of a Deep‐Buried Soft Soil Conveyance Tunnel Crossing Soft‐Hard Soil Layers Under High‐Pressure Water Conditions2025
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  3. 3Ground Settlement Analysis of Twin Shield Tunnels Under River-Crossing Conditions with Fluid–Solid Coupling2026
  4. 4Seismic Response and Predictive Modeling of Large-Diameter Shield Tunnels with Voids Behind Lining2026
  5. 5Sectional Differences in Stratum Response and Construction Parameter Sensitivity During River-Crossing Double-Line Shield Tunneling2026