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<p>Bored pile of constrained grouting expansion (BPCGE) is a novel pile type that integrates the confined grout, compression, and expansion processes. However, its vertically compressive bearing characteristics and failure mechanism remain insufficiently understood. The study employed the laboratory visualization of BPCGE model tests and digital image correlation (DIC) technology to investigate the bearing characteristics and failure mechanism. Firstly, a mathematical relationship between the piezocone penetration test (CPTU) data and pile-bearing capacity is established. A method for determining the ultimate bearing capacity of BPCGE is proposed. Next, the visualized static load tests are conducted to analyze the bearing characteristics of BPCGE. The DIC technology is used to obtain the displacement and deformation of surrounding soil and analyze the failure mechanism of BPCGE. Subsequently, a joint bearing capacity method is proposed for the soil failure characteristics at the pile end. The results demonstrated that BPCGE exhibits a strong bearing performance and is classified as an end-bearing friction pile. The primary failure mode of BPCGE involves the shear failure of the surrounding soil. The proposed ultimate bearing capacity method, based on CPTU data, effectively provides a reliable theory for its application.</p>

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Mechanism research of the constrained grouting expansion bored pile based on visualization tests and CPTU technologies

  • 期刊论文

  • 发表日期：

    2025年1月9日

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  • Changhong Wang,
  • Daofei Tang,
  • Chengtao Ma,
  • Kun Wang,
  • Tianhu Li,
  • Yang Shen,
  • Baolin Hu

摘要

Bored pile of constrained grouting expansion (BPCGE) is a novel pile type that integrates the confined grout, compression, and expansion processes. However, its vertically compressive bearing characteristics and failure mechanism remain insufficiently understood. The study employed the laboratory visualization of BPCGE model tests and digital image correlation (DIC) technology to investigate the bearing characteristics and failure mechanism. Firstly, a mathematical relationship between the piezocone penetration test (CPTU) data and pile-bearing capacity is established. A method for determining the ultimate bearing capacity of BPCGE is proposed. Next, the visualized static load tests are conducted to analyze the bearing characteristics of BPCGE. The DIC technology is used to obtain the displacement and deformation of surrounding soil and analyze the failure mechanism of BPCGE. Subsequently, a joint bearing capacity method is proposed for the soil failure characteristics at the pile end. The results demonstrated that BPCGE exhibits a strong bearing performance and is classified as an end-bearing friction pile. The primary failure mode of BPCGE involves the shear failure of the surrounding soil. The proposed ultimate bearing capacity method, based on CPTU data, effectively provides a reliable theory for its application.