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<p>Transparent soil technology was used to conduct model experiments on both a single intact pile and five necking piles with caps. The study focused on investigating the vertical bearing capacity (VBC) of the necking piles taking into account the position and diameter of the necking. To analyze the characteristics of the VBC of the necking piles, the MatPIV program was employed to capture soil displacement around the piles. The obtained data shed light on how the necking affects the exertion of pile shaft resistance. The results revealed that the presence of necking significantly limits the shaft resistance of the pile. Furthermore, it was found that the impact of the necking on the VBC of the pile is more pronounced when the necking is closer to the pile cap or when its diameter is smaller. In such cases, the necking greatly weakens the VBC of the pile. Notably, when the necking is located in the shallow part of the pile shaft, near the pile cap, the VBC loss in the necking pile can reach as high as 31.19% compared to that of an intact pile. This finding has important implications for engineering safety assessment and management.</p>

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Characteristic Investigation of Bearing Performance for Necking Piles with Caps Assisted with Transparent Soil Technology

  • 期刊论文

  • 发表日期：

    2026年3月1日

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  • Zhijun Xu,
  • Zhaoxiang Guo,
  • Zhengquan Wang,
  • Le Wang,
  • Liang Fan

摘要

Transparent soil technology was used to conduct model experiments on both a single intact pile and five necking piles with caps. The study focused on investigating the vertical bearing capacity (VBC) of the necking piles taking into account the position and diameter of the necking. To analyze the characteristics of the VBC of the necking piles, the MatPIV program was employed to capture soil displacement around the piles. The obtained data shed light on how the necking affects the exertion of pile shaft resistance. The results revealed that the presence of necking significantly limits the shaft resistance of the pile. Furthermore, it was found that the impact of the necking on the VBC of the pile is more pronounced when the necking is closer to the pile cap or when its diameter is smaller. In such cases, the necking greatly weakens the VBC of the pile. Notably, when the necking is located in the shallow part of the pile shaft, near the pile cap, the VBC loss in the necking pile can reach as high as 31.19% compared to that of an intact pile. This finding has important implications for engineering safety assessment and management.