In energy geostructures, the soil-structure interface is subjected to thermo-mechanical loads. In this study, a non-isothermal soil-structure interface model based on critical state theory is developed from a granular soil-structure interface constitutive model under isothermal conditions. The model is capable of capturing the effect of temperature on sand/clay-structure interfaces under constant normal load and constant normal stiffness conditions. First, the developed model was verified for sand-structure interface in isothermal conditions. Then, it was calibrated for clay-structure interface under non-isothermal conditions. On one hand, a well-defined peak shear stress for the clay-structure interface and, on the other hand, the effect of temperature on the void ratio of the clay-structure interface were captured and reproduced by the model. The importance of interface thickness determination and some differences between the interface thicknesses of clay-structure and sand-structure interfaces are discussed in detail. The additional parameters have physical meanings and can be determined from laboratory tests. The modeling predictions are in good agreement with experimental results, and the main trends are properly reproduced.

在能源地质结构中，土壤-结构界面承受热机械载荷。本研究从等温条件下的粒状土-结构界面本构模型出发，建立了基于临界状态理论的非等温土-结构界面模型。该模型能够在恒定法向载荷和恒定法向刚度条件下捕获温度对砂土/粘土结构界面的影响。首先，验证了开发模型在等温条件下的砂-结构界面。然后，在非等温条件下对粘土-结构界面进行了校准。一方面，通过模型捕获并再现了粘土结构界面的明确定义的峰值剪切应力，另一方面，温度对粘土结构界面的空隙率的影响也得以再现。详细讨论了界面厚度确定的重要性以及粘土结构和砂土结构界面的界面厚度之间的一些差异。附加参数具有物理意义，可以从实验室测试中确定。建模预测与实验结果非常吻合，并且可以正确再现主要趋势。