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<p>Soft-cut pile head technology is widely used in pile foundation construction, yet the damage evolution mechanism of concrete under this process remains insufficiently understood, particularly under triaxial stress conditions. This study presents a novel experimental approach integrating triaxial loading tests with in-situ X-ray computed tomography (CT) scanning to enable synchronous observation of mechanical behavior and microstructural evolution in concrete. Based on CT image 3D reconstruction, a quantitative analysis of internal damage development was performed, revealing the spatial evolution of micropores and microcracks under increasing axial stress. The results demonstrate that: (1) the pre-peak stage is characterized by slow microcrack propagation, while the post-peak stage exhibits rapid pore coalescence and mortar interface failure; (2) damage evolution exhibits significant spatial heterogeneity, with newly formed pores predominantly distributed below 0.5&#xa0;mm; (3) a quantitative damage evolution equation was established based on gray value analysis. The proposed CT-triaxial linkage method provides a robust framework for damage assessment of pile head concrete, offering both theoretical insights into the microscopic damage mechanisms underlying macroscopic failure and practical guidance for quality control in soft-cut pile foundation construction.</p>

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Microscopic evolution mechanism of damage in soft cut pile head concrete based on CT-triaxial linkage

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Haikuan Wu,
  • Yuehui Li,
  • Kezheng Zhu,
  • Baoxian Liu,
  • Zhile Shu,
  • Zhipeng Xu,
  • Yichen Miao

摘要

Soft-cut pile head technology is widely used in pile foundation construction, yet the damage evolution mechanism of concrete under this process remains insufficiently understood, particularly under triaxial stress conditions. This study presents a novel experimental approach integrating triaxial loading tests with in-situ X-ray computed tomography (CT) scanning to enable synchronous observation of mechanical behavior and microstructural evolution in concrete. Based on CT image 3D reconstruction, a quantitative analysis of internal damage development was performed, revealing the spatial evolution of micropores and microcracks under increasing axial stress. The results demonstrate that: (1) the pre-peak stage is characterized by slow microcrack propagation, while the post-peak stage exhibits rapid pore coalescence and mortar interface failure; (2) damage evolution exhibits significant spatial heterogeneity, with newly formed pores predominantly distributed below 0.5 mm; (3) a quantitative damage evolution equation was established based on gray value analysis. The proposed CT-triaxial linkage method provides a robust framework for damage assessment of pile head concrete, offering both theoretical insights into the microscopic damage mechanisms underlying macroscopic failure and practical guidance for quality control in soft-cut pile foundation construction.