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<p>Soil drying–wetting (D–W) cycles, a widespread natural phenomenon, pose significant challenges to numerical modeling due to coupled multi-physical interactions, dynamic crack evolution, and degradation of hydro-mechanical properties. To simulate continuous D–W cycles, this study develops a fully coupled thermo-hygro-mechanical ordinary state-based peridynamic (THM OSB-PD) model. The proposed framework innovatively incorporates a fracture-healing criterion and a reduction function to model drying-induced cracking, wetting-phase healing, and progressive deterioration of mechanical strength during D–W cycles. Using a sequential staggered implicit solution algorithm to ensure convergence and efficiency, the model reproduces experimental observations, such as crack memory, sequential healing, and crack evolution characteristics. Meanwhile, hydraulic hysteresis is captured by embedding dynamic soil–water characteristic curve (SWCC) parameters into moisture diffusion equations. Moreover, comparative analysis of isothermal and non-isothermal D–W cycles reveals differences in crack network morphology, moisture content and matric suction distribution, vertical strain, and SWCCs, underscoring the critical influence of temperature. The results demonstrate that the proposed THM OSB-PD model effectively captures crack propagation and healing during D–W cycles, providing a foundation for investigating soil behavior under hydraulic cycling.</p>

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A coupled thermo-hygro-mechanical peridynamics for soil drying–wetting cycles: crack propagation and healing

  • 期刊论文

  • 发表日期：

    2025年12月8日

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  • Qiao Yanhe,
  • Liu Panyong,
  • Gu Xin,
  • Zhang Qing

摘要

Soil drying–wetting (D–W) cycles, a widespread natural phenomenon, pose significant challenges to numerical modeling due to coupled multi-physical interactions, dynamic crack evolution, and degradation of hydro-mechanical properties. To simulate continuous D–W cycles, this study develops a fully coupled thermo-hygro-mechanical ordinary state-based peridynamic (THM OSB-PD) model. The proposed framework innovatively incorporates a fracture-healing criterion and a reduction function to model drying-induced cracking, wetting-phase healing, and progressive deterioration of mechanical strength during D–W cycles. Using a sequential staggered implicit solution algorithm to ensure convergence and efficiency, the model reproduces experimental observations, such as crack memory, sequential healing, and crack evolution characteristics. Meanwhile, hydraulic hysteresis is captured by embedding dynamic soil–water characteristic curve (SWCC) parameters into moisture diffusion equations. Moreover, comparative analysis of isothermal and non-isothermal D–W cycles reveals differences in crack network morphology, moisture content and matric suction distribution, vertical strain, and SWCCs, underscoring the critical influence of temperature. The results demonstrate that the proposed THM OSB-PD model effectively captures crack propagation and healing during D–W cycles, providing a foundation for investigating soil behavior under hydraulic cycling.