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<p>A deep foundation pit for an urban substation in Chengdu, China, excavated in a sandy gravel layer with an excavation depth of 24.6 m, was investigated. Detailed field surveys and field monitoring were carried out to investigate the deformation characteristics of the foundation pit and supporting structure related to excavation. Flac3D software and orthogonal testing were used to analyze optimal pile anchor design parameters by calculating the effects of five influencing factors, namely, pile diameter, pile spacing, anchor cable prestress, anchor angle, and number of rows of anchor cables, on the deformation of the deep foundation pit. Analysis of the optimization effect indicated that although there was a small increase in displacement when adopting the optimized plan, the value of the displacement still satisfied required specifications. The proposed optimization scheme not only ensures the safety and stability of the foundation pit but also reduces construction costs and provides guidance for the design optimization of projects with similar geological conditions.</p>

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Optimization of Pile Anchor Supporting Parameters of a Substation Deep Foundation Pit

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • R. Q. Fan,
  • W. H. Zeng,
  • M. Xia,
  • H. M. Wang,
  • Y. Tang,
  • B. Dong,
  • Y. F. Jiao,
  • Y. Luo

摘要

A deep foundation pit for an urban substation in Chengdu, China, excavated in a sandy gravel layer with an excavation depth of 24.6 m, was investigated. Detailed field surveys and field monitoring were carried out to investigate the deformation characteristics of the foundation pit and supporting structure related to excavation. Flac3D software and orthogonal testing were used to analyze optimal pile anchor design parameters by calculating the effects of five influencing factors, namely, pile diameter, pile spacing, anchor cable prestress, anchor angle, and number of rows of anchor cables, on the deformation of the deep foundation pit. Analysis of the optimization effect indicated that although there was a small increase in displacement when adopting the optimized plan, the value of the displacement still satisfied required specifications. The proposed optimization scheme not only ensures the safety and stability of the foundation pit but also reduces construction costs and provides guidance for the design optimization of projects with similar geological conditions.