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The 110 kV transmission line project traverses Wuhe District, Bengbu City, Anhui Province, China, where the foundation is embedded at a depth of 6 m in a saturated silty clay stratum. This study focuses on consolidated undrained triaxial tests conducted on undisturbed silty clay samples. Scanning electron microscopy (SEM) was used to examine the soil microstructure before and after triaxial testing. Digital image processing technology was employed to perform three-dimensional visualization modeling and quantitative analysis of SEM images, aiming to elucidate the microstructural evolution mechanism of saturated silty clay.The results show that the undisturbed silty clay exhibits intact cementation, with particle contact modes characterized by both face-to-face and edge-to-edge connections, along with abundant cementing materials. After triaxial compression test, the samples showed a shear-type failure mode. Near the shear zone, significant cementation fractures and pore closure were observed, accompanied by partial particle rearrangement. Within the shear zone, the soil presented extensive cementation fractures, substantial pore closure, and more remarkable particle rearrangement, leading to a denser contact structure. Additionally, surface roughness and concavity were significantly reduced.This study provides valuable insights into the microstructural changes of saturated silty clay under mechanical loading, offering a theoretical basis for foundation design in similar engineering projects.

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Research on the Microstructure Evolution Law of Saturated Silty Clay Based on Digital Analysis

  • 会议论文

  • 发表日期：

    2026年

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  • Jun Zhang,
  • Jiang He,
  • Fan Wu,
  • Mintao Ding,
  • Chao Gao

摘要

The 110 kV transmission line project traverses Wuhe District, Bengbu City, Anhui Province, China, where the foundation is embedded at a depth of 6 m in a saturated silty clay stratum. This study focuses on consolidated undrained triaxial tests conducted on undisturbed silty clay samples. Scanning electron microscopy (SEM) was used to examine the soil microstructure before and after triaxial testing. Digital image processing technology was employed to perform three-dimensional visualization modeling and quantitative analysis of SEM images, aiming to elucidate the microstructural evolution mechanism of saturated silty clay.The results show that the undisturbed silty clay exhibits intact cementation, with particle contact modes characterized by both face-to-face and edge-to-edge connections, along with abundant cementing materials. After triaxial compression test, the samples showed a shear-type failure mode. Near the shear zone, significant cementation fractures and pore closure were observed, accompanied by partial particle rearrangement. Within the shear zone, the soil presented extensive cementation fractures, substantial pore closure, and more remarkable particle rearrangement, leading to a denser contact structure. Additionally, surface roughness and concavity were significantly reduced.This study provides valuable insights into the microstructural changes of saturated silty clay under mechanical loading, offering a theoretical basis for foundation design in similar engineering projects.