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<p>Understanding the deterioration behaviors and mechanisms of rocks under thermo-hydromechanical (THM) interactions is crucial for mitigating slope instability. In this study, the physicomechanical properties of silty mudstone subjected to THM interactions were investigated by triaxial tests. The underlying micro-mechanisms were revealed using microscopic tests. The triaxial test results indicate that the strength parameters of silty mudstone decrease by 89.50% (deformation modulus), 78.15% (peak strength), 70.58% (cohesion), and 48.65% (friction angle) under 16 THM cycles, a load of 300 kPa, and alternating between 0°C water immersion and 60°C drying. The SEM test results indicate that the deterioration of silty mudstone strength primarily results from hydrothermal-expansion softening and cracking driven by the TLHM interactions. The specimens manifest shear failure under confining pressure exceeding 140 kPa. Furthermore, a new constitutive model considering hydrothermalexpansion strain and non-linear deformation characteristics was developed. The discrepancy between the experimentally measured peak strength and the damage constitutive model prediction remains below 5%. The proposed model is verified to be in satisfactory agreement with the experimental results. The self-designed THM apparatus overcomes the limitations of traditional investigations, enabling simultaneous consideration of thermal, hydraulic, and mechanical interactions.</p>

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Mechanical behavior and damage constitutive model of silty mudstone under thermo-hydro-mechanical interactions

  • 期刊论文

  • 发表日期：

    2026年1月14日

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  • Ling Zeng,
  • Hui Cheng,
  • Jianping Song,
  • Jianping Xiong,
  • Hongri Zhang,
  • Jingcheng Chen,
  • Wenguang Wang,
  • Youjun Li,
  • Jie Liu

摘要

Understanding the deterioration behaviors and mechanisms of rocks under thermo-hydromechanical (THM) interactions is crucial for mitigating slope instability. In this study, the physicomechanical properties of silty mudstone subjected to THM interactions were investigated by triaxial tests. The underlying micro-mechanisms were revealed using microscopic tests. The triaxial test results indicate that the strength parameters of silty mudstone decrease by 89.50% (deformation modulus), 78.15% (peak strength), 70.58% (cohesion), and 48.65% (friction angle) under 16 THM cycles, a load of 300 kPa, and alternating between 0°C water immersion and 60°C drying. The SEM test results indicate that the deterioration of silty mudstone strength primarily results from hydrothermal-expansion softening and cracking driven by the TLHM interactions. The specimens manifest shear failure under confining pressure exceeding 140 kPa. Furthermore, a new constitutive model considering hydrothermalexpansion strain and non-linear deformation characteristics was developed. The discrepancy between the experimentally measured peak strength and the damage constitutive model prediction remains below 5%. The proposed model is verified to be in satisfactory agreement with the experimental results. The self-designed THM apparatus overcomes the limitations of traditional investigations, enabling simultaneous consideration of thermal, hydraulic, and mechanical interactions.