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<p>This study investigates deformation mechanisms of flood embankments during adjacent subway shield tunnel construction through field monitoring. Key findings reveal: (1) Surface settlement evolution exhibits five distinct stages corresponding to tunnel face advancement, with maximum settlement reaching 12.7 mm. (2) Settlement trough morphology demonstrates stage-dependent characteristics influenced by grouting measures—synchronous grouting induced 58% greater deformation than secondary grouting above tunnel alignment. (3) Secondary grouting produces notable temporal-spatial effects, generating surface uplift (0.5–1.2 mm) and reducing settlement rates by 34–41%. (4) Critical deformation inflection points consistently occur 7–10 days post-secondary grouting. The quantitative relationships established between construction parameters and embankment response provide practical guidance for deformation control in similar urban underground projects.</p>

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Spatio-temporal response characteristics of flood embankment deformation during shield tunnel excavation

  • 期刊论文

  • 发表日期：

    2025年4月23日

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  • Qingxiong Zhao,
  • Ping Cao,
  • Jinshuo Liu,
  • Hang Lin

摘要

This study investigates deformation mechanisms of flood embankments during adjacent subway shield tunnel construction through field monitoring. Key findings reveal: (1) Surface settlement evolution exhibits five distinct stages corresponding to tunnel face advancement, with maximum settlement reaching 12.7 mm. (2) Settlement trough morphology demonstrates stage-dependent characteristics influenced by grouting measures—synchronous grouting induced 58% greater deformation than secondary grouting above tunnel alignment. (3) Secondary grouting produces notable temporal-spatial effects, generating surface uplift (0.5–1.2 mm) and reducing settlement rates by 34–41%. (4) Critical deformation inflection points consistently occur 7–10 days post-secondary grouting. The quantitative relationships established between construction parameters and embankment response provide practical guidance for deformation control in similar urban underground projects.