发表机构
University of Luxembourg; Universitat Politecnica de Catalunya (UPC); International Centre for Numerical Methods in Engineering (CIMNE)（卢森堡大学; 加泰罗尼亚理工大学; 国际工程数值方法中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究针对黏土滑动面提出非等温黏塑性本构模型，结合零厚度界面单元与水力、热平衡方程，经环剪试验验证后应用于边坡基准案例，揭示温度相关界面退化会降低黏土坡稳定裕度，应纳入边坡稳定性评估。
AI 中文摘要
黏土滑动面控制着慢速滑坡的再活动和长期变形，且可能受到气候、季节性地温变化或地下热源引起的热波动影响。实验表明，残余抗剪强度依赖于温度和剪切速率，但大多数数值方法采用与温度无关的强度参数。我们提出了一种黏土滑动面的非等温黏塑性本构模型，采用零厚度界面单元实现，该模型包含与温度相关的法向和切向刚度、黏聚力和内摩擦角的渐进退化，以及由非关联流动法则控制的与速率相关的黏塑性滑动。与水力和热平衡方程的耦合使得界面响应能够随应力状态、温度、开度和累积不可逆位移演化。针对膨润土和富蒙脱石土壤的温度控制排水环剪试验的验证涵盖了加热-冷却、冷却-加热以及组合热路径。模拟再现了慢剪切速率下的热强化，以及高剪切速率下的热弱化或有限敏感性。在Congress Street路堑基准案例中的应用表明，零厚度单元改善了应变局部化和渐进破坏的表征。温度升高会逐步降低界面强度，增加位移、开度和剪切应变，并加速滑动。因此，与温度相关的界面退化可减小黏土坡的表观稳定裕度，应纳入涉及热波动的边坡稳定性评估中。
英文摘要
Clayey slip surfaces control the reactivation and long-term deformation of slow-moving landslides and may experience thermal fluctuations from climate, seasonal ground-temperature changes, or subsurface heat sources. Experiments show that residual shear strength depends on temperature and shearing rate, yet most numerical approaches use temperature-independent strength parameters. We present a non-isothermal viscoplastic constitutive model for clayey slip surfaces implemented with zero-thickness interface elements. It includes temperature-dependent normal and tangential stiffness, progressive degradation of cohesion and friction angle, and rate-dependent viscoplastic slip governed by a non-associated flow rule. Coupling with hydraulic and thermal balance equations allows the interface response to evolve with stress state, temperature, aperture, and accumulated irreversible displacement. Validation against temperature-controlled drained ring-shear tests on bentonite and smectite-rich soils covers heating--cooling, cooling--heating, and combined thermal paths. The simulations reproduce thermal strengthening at slow shearing rates and thermal weakening or limited sensitivity at higher rates. Application to the Congress Street cut benchmark shows that zero-thickness elements improve the representation of strain localization and progressive failure. Increasing temperature progressively degrades interface strength, increases displacement, joint aperture, and shear strain, and accelerates sliding. Temperature-dependent interface degradation can therefore reduce the apparent stability margin of clayey slopes and should be included in slope-stability assessments involving thermal fluctuations.
