Scholarlink

<p>Leakage during shield tunnel construction can induce soil erosion, ground subsidence, and even catastrophic tunnel collapse. To investigate the underlying mechanism, this study takes the 2003 Shanghai Metro Line 4 accident as a case study. A coupled tunnel-strata model is developed by integrating a Discrete Element Method (DEM)-Finite Difference Method (FDM) approach for the surrounding strata and a nonlinear Finite Element Method (FEM) model for the tunnel structure. Simulation results reveal a staged collapse process. Initially, seepage-induced erosion forms soil caves, with soil arches developing around the leakage point. Stress concentration occurs at the arch foot, corresponding to the 330° and 0° positions on the tunnel crown, leading to plastic hinge formation at the joints. Although structural damage appears, the tunnel remains temporarily stable due to the soil arching effect. Once the soil arch loses stability, overlying soil collapses, generating impact loads up to 4.6 times the initial soil pressure, ultimately causing structural failure. The novelty of this work lies in establishing a coupled numerical model that captures the full interaction between leakage, soil arch evolution, staged ground settlement, and tunnel collapse. The findings provide a theoretical basis for early warning indicators and emergency mitigation strategies in shield tunnel projects.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Mechanistic Analysis of Leakage-Induced Tunnel Collapse: Case Study from Shanghai Metro Line 4

  • 期刊论文

  • 发表日期：

    2025年9月2日

查看全文
  • Qihao Sun,
  • Xian Liu,
  • Yihai Bao,
  • Wouter De Corte,
  • Luc Taerwe

摘要

Leakage during shield tunnel construction can induce soil erosion, ground subsidence, and even catastrophic tunnel collapse. To investigate the underlying mechanism, this study takes the 2003 Shanghai Metro Line 4 accident as a case study. A coupled tunnel-strata model is developed by integrating a Discrete Element Method (DEM)-Finite Difference Method (FDM) approach for the surrounding strata and a nonlinear Finite Element Method (FEM) model for the tunnel structure. Simulation results reveal a staged collapse process. Initially, seepage-induced erosion forms soil caves, with soil arches developing around the leakage point. Stress concentration occurs at the arch foot, corresponding to the 330° and 0° positions on the tunnel crown, leading to plastic hinge formation at the joints. Although structural damage appears, the tunnel remains temporarily stable due to the soil arching effect. Once the soil arch loses stability, overlying soil collapses, generating impact loads up to 4.6 times the initial soil pressure, ultimately causing structural failure. The novelty of this work lies in establishing a coupled numerical model that captures the full interaction between leakage, soil arch evolution, staged ground settlement, and tunnel collapse. The findings provide a theoretical basis for early warning indicators and emergency mitigation strategies in shield tunnel projects.