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This study investigates the control mechanisms of surface settlement during shield tunneling in silty clay strata through three-dimensional finite element analysis. The research quantifies the effects of chamber pressure and soil mechanical properties (Poisson's ratio, cohesion, and friction angle) on settlement patterns. Results demonstrate a critical chamber pressure threshold of 200 kPa, with settlement reduction up to 45% below this value but ground heave occurring above it. Poisson's ratio variations (0.1–0.4) significantly influence settlement magnitude, showing distinct behavior below and above 0.3. Cohesion exhibits a nonlinear relationship, with 40 kPa as the inflection point where settlement trends reverse (5.8% decrease beyond this value). For friction angle (8°–28°), settlement follows a V-shaped curve with 23° identified as the optimal control parameter. These findings provide quantitative guidelines for settlement mitigation in silty clay environments.

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Surface Settlement Control in Shield Tunneling: Interplay Between Chamber Pressure and Silty Clay Mechanical Parameters

  • 会议论文

  • 发表日期：

    2026年

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  • Nan Zhang,
  • Shijie Zou,
  • Chen-Yuan Chiu,
  • Jianyu Lin,
  • Zile Huang,
  • Yu Lin

摘要

This study investigates the control mechanisms of surface settlement during shield tunneling in silty clay strata through three-dimensional finite element analysis. The research quantifies the effects of chamber pressure and soil mechanical properties (Poisson's ratio, cohesion, and friction angle) on settlement patterns. Results demonstrate a critical chamber pressure threshold of 200 kPa, with settlement reduction up to 45% below this value but ground heave occurring above it. Poisson's ratio variations (0.1–0.4) significantly influence settlement magnitude, showing distinct behavior below and above 0.3. Cohesion exhibits a nonlinear relationship, with 40 kPa as the inflection point where settlement trends reverse (5.8% decrease beyond this value). For friction angle (8°–28°), settlement follows a V-shaped curve with 23° identified as the optimal control parameter. These findings provide quantitative guidelines for settlement mitigation in silty clay environments.