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<p>The excavation and unloading of deep foundation pits of metro stations cause surrounding buildings to deform. Building deformation has significant differences due to different methods of supporting the foundation pit and building foundation forms. To evaluate this deformation difference, this study established a three-dimensional numerical finite element model of a deep foundation pit considering different foundation types of buildings (independent, box, and pile foundations). The results show that the combination of isolation piles and a diaphragm wall is more effective in supporting building deformation than using a diaphragm wall alone. The independent foundation is the most significant, and the pile foundation is the lowest. The deformation of shallow foundation buildings is more sensitive to the excavation of the foundation pit, and the reasonable increase in the isolation pile length can significantly reduce the deformation sensitivity; changing the length of the isolation pile cannot significantly reduce the deformation of the building.</p>

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Evaluation of Deformation of Adjacent Buildings Caused by Foundation Pit Excavation Under Combined Support of Isolation Pile and Diaphragm Wall

  • 期刊论文

  • 发表日期：

    2025年1月13日

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  • Shaokun Ma,
  • Fapai Tian,
  • Zhen Huang,
  • Hu Lu,
  • Xiaoxi Fu

摘要

The excavation and unloading of deep foundation pits of metro stations cause surrounding buildings to deform. Building deformation has significant differences due to different methods of supporting the foundation pit and building foundation forms. To evaluate this deformation difference, this study established a three-dimensional numerical finite element model of a deep foundation pit considering different foundation types of buildings (independent, box, and pile foundations). The results show that the combination of isolation piles and a diaphragm wall is more effective in supporting building deformation than using a diaphragm wall alone. The independent foundation is the most significant, and the pile foundation is the lowest. The deformation of shallow foundation buildings is more sensitive to the excavation of the foundation pit, and the reasonable increase in the isolation pile length can significantly reduce the deformation sensitivity; changing the length of the isolation pile cannot significantly reduce the deformation of the building.