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<p>Freeze-thaw cycles critically influence the deterioration of microstructural and engineering properties of moraine soil in seasonally frozen regions. Multi-scale tests and piezoelectric ceramic intelligent monitoring technology were conducted to investigate the macroscopic mechanical response, microstructural evolution, and piezoelectric signal characteristics of moraine soil under varying water contents and freeze-thaw cycles. An evaluation index for the internal friction angle based on piezoelectric signal energy was established. Key findings are as follows: (1) The stress-strain curve of moraine soil exhibits typical strain-softening behavior. Elastic modulus, shear strength, and internal friction angle deteriorate nonlinearly with increasing freeze-thaw cycles, while cohesion evolution displays heterogeneous responses. (2) Freeze-thaw action significantly increases soil porosity, progressively rounds particles, and shifts contact modes from surface-to-surface to point-to-point. (3) Piezoelectric signal parameters strongly align with mechanical deterioration trends in elastic modulus, shear strength, and internal friction angle. Specifically, the correlation between the damage index (MFAD) derived from piezoelectric signal energy and the internal friction angle exceeds 96%. By integrating macro-mechanics, micro-structure, and piezoelectric signal analysis, this work elucidates the multi-scale mechanism of freeze-thaw deterioration in moraine soil, providing theoretical support and a practical monitoring tool for stability assessment of cold-region foundations.</p>

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Research on multi-scale degradation mechanisms of mechanical properties and piezoelectric ceramic-enabled intelligent monitoring in moraine soil subject to freeze-thaw cycles

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Songming Xie,
  • Bo Wang,
  • Yan Zhang,
  • Jie Dong,
  • Shiwang Gu,
  • Xiaojuan Quan

摘要

Freeze-thaw cycles critically influence the deterioration of microstructural and engineering properties of moraine soil in seasonally frozen regions. Multi-scale tests and piezoelectric ceramic intelligent monitoring technology were conducted to investigate the macroscopic mechanical response, microstructural evolution, and piezoelectric signal characteristics of moraine soil under varying water contents and freeze-thaw cycles. An evaluation index for the internal friction angle based on piezoelectric signal energy was established. Key findings are as follows: (1) The stress-strain curve of moraine soil exhibits typical strain-softening behavior. Elastic modulus, shear strength, and internal friction angle deteriorate nonlinearly with increasing freeze-thaw cycles, while cohesion evolution displays heterogeneous responses. (2) Freeze-thaw action significantly increases soil porosity, progressively rounds particles, and shifts contact modes from surface-to-surface to point-to-point. (3) Piezoelectric signal parameters strongly align with mechanical deterioration trends in elastic modulus, shear strength, and internal friction angle. Specifically, the correlation between the damage index (MFAD) derived from piezoelectric signal energy and the internal friction angle exceeds 96%. By integrating macro-mechanics, micro-structure, and piezoelectric signal analysis, this work elucidates the multi-scale mechanism of freeze-thaw deterioration in moraine soil, providing theoretical support and a practical monitoring tool for stability assessment of cold-region foundations.