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<p>Clay-rich siliceous mudstone (CSM) is prone to wet-dry cycle (WDC)-induced damage, threatening infrastructure stability. Existing studies predominantly rely on porosity to assess damage, neglecting critical microstructural features like pore connectivity and pore morphology. In this study, micron-scale X-ray computed tomography (Micro-CT) and mechanical tests were used to investigate the dynamic evolution of CSM microstructure and mechanical property deterioration under WDC. Results reveal a two-stage damage process: initial slow porosity growth (0–3 WDC) dominated by isolated pores, followed by rapid development of connected pores and pore throats (3–15 WDC). A critical transition occurs after 3 WDC, where isolated pores merge into connected networks, accelerating the damage of mechanical properties. A novel multi-factor microstructure parameter integrating isolated/connected porosity, fractal dimension, and sphericity of the pore structure was proposed. Compared with traditional porosity-based correlations, the proposed parameter demonstrates higher accuracy in predicting the macroscopic mechanical damage of CSM. This advancement provides a reliable framework for evaluating the long-term stability of mudstone slope and establishes a cross-scale damage prediction method for inhomogeneous geotechnical materials.</p>

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Quantifying Damage Evolution in Clay-Rich Siliceous Mudstone Under Wet-Dry Cycles Based on Multi-Factor Microstructure Parameter

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Qingsong Zhang,
  • Zhibin Liu,
  • Chenghua Xu,
  • Guoyi Tang,
  • Yinjuan Sun,
  • Zhuyu Zhao

摘要

Clay-rich siliceous mudstone (CSM) is prone to wet-dry cycle (WDC)-induced damage, threatening infrastructure stability. Existing studies predominantly rely on porosity to assess damage, neglecting critical microstructural features like pore connectivity and pore morphology. In this study, micron-scale X-ray computed tomography (Micro-CT) and mechanical tests were used to investigate the dynamic evolution of CSM microstructure and mechanical property deterioration under WDC. Results reveal a two-stage damage process: initial slow porosity growth (0–3 WDC) dominated by isolated pores, followed by rapid development of connected pores and pore throats (3–15 WDC). A critical transition occurs after 3 WDC, where isolated pores merge into connected networks, accelerating the damage of mechanical properties. A novel multi-factor microstructure parameter integrating isolated/connected porosity, fractal dimension, and sphericity of the pore structure was proposed. Compared with traditional porosity-based correlations, the proposed parameter demonstrates higher accuracy in predicting the macroscopic mechanical damage of CSM. This advancement provides a reliable framework for evaluating the long-term stability of mudstone slope and establishes a cross-scale damage prediction method for inhomogeneous geotechnical materials.