Scholarlink

<p>Stress perturbations in paraglacial rock slopes during glacial cycles are complex due to simultaneous changes in thermal, hydraulic and mechanical boundary conditions. Field monitoring data are scarce and difficult to obtain, and long-term processes are only accessible through numerical simulations. In this study, we designed and applied a coupled thermo-hydro-mechanical (THM) triaxial rock mechanical testing protocol, qualitatively comparable to glacial load cycling in a paraglacial setting. We considered freeze–thaw cycles (− 10&#xa0;°C to + 10&#xa0;°C) combination with large mechanical loading cycles (0–60&#xa0;MPa) and hydraulic pressure cycles (0–2&#xa0;MPa) set to achieve rock damage. Using control group tests, we separated the contributions of thermal, hydraulic, and mechanical loads to reversible and irreversible deformation during varying observation periods, as well as the damage contributions of each loading mechanism during a multistage cycling process. We find that the addition of thermal and hydraulic loads promotes reversible and irreversible deformation, making paraglacial slopes more prone to instability than other rock slopes. The initial cycle contributes the most to damage, and instantaneous deformation is much greater than long-term deformation. The contributions of thermal, hydraulic, and mechanical loads to reversible and irreversible deformations vary as a function of loading cycle. For the given loading conditions, instantaneous reversible deformation is dominated by mechanical load regardless of the number of cycles. Instantaneous irreversible deformation is mainly caused by mechanical load in the first cycle, followed by hydraulic and thermal loads. Long-term reversible deformation is dominated by thermal load, and long-term irreversible deformation by hydraulic load. This study provides laboratory insights into the progressive failure of paraglacial bedrock.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Investigating Coupled Thermo-Hydro-Mechanical Damage in Paraglacial Bedrock at Laboratory Scale

  • 期刊论文

  • 发表日期：

    2026年2月6日

查看全文
  • Guoqing Chen,
  • Xiang Sun,
  • Simon Loew,
  • V. R. S. De Silva

摘要

Stress perturbations in paraglacial rock slopes during glacial cycles are complex due to simultaneous changes in thermal, hydraulic and mechanical boundary conditions. Field monitoring data are scarce and difficult to obtain, and long-term processes are only accessible through numerical simulations. In this study, we designed and applied a coupled thermo-hydro-mechanical (THM) triaxial rock mechanical testing protocol, qualitatively comparable to glacial load cycling in a paraglacial setting. We considered freeze–thaw cycles (− 10 °C to + 10 °C) combination with large mechanical loading cycles (0–60 MPa) and hydraulic pressure cycles (0–2 MPa) set to achieve rock damage. Using control group tests, we separated the contributions of thermal, hydraulic, and mechanical loads to reversible and irreversible deformation during varying observation periods, as well as the damage contributions of each loading mechanism during a multistage cycling process. We find that the addition of thermal and hydraulic loads promotes reversible and irreversible deformation, making paraglacial slopes more prone to instability than other rock slopes. The initial cycle contributes the most to damage, and instantaneous deformation is much greater than long-term deformation. The contributions of thermal, hydraulic, and mechanical loads to reversible and irreversible deformations vary as a function of loading cycle. For the given loading conditions, instantaneous reversible deformation is dominated by mechanical load regardless of the number of cycles. Instantaneous irreversible deformation is mainly caused by mechanical load in the first cycle, followed by hydraulic and thermal loads. Long-term reversible deformation is dominated by thermal load, and long-term irreversible deformation by hydraulic load. This study provides laboratory insights into the progressive failure of paraglacial bedrock.