This paper presents the establishment of a macro-mesoscopic constitutive model based on poromechanics for investigating the mechanics of warm frozen soil. The elastic parameters of warm frozen soil are influenced by the ice content variations during the loading process, considering the pressure melting characteristic of warm frozen soil. Through the integration of poromechanics and mesomechanics, a macro-mesoscopic constitutive model incorporating the pressure melting effect is developed to characterize the mechanical properties of warm frozen soil. The proposed model establishes a relationship between the elastic modulus at the mesoscopic and macroscopic scales of warm frozen soil.To validate the model, a comparison is made between the model predictions and experimental data obtained from warm frozen silt. The results demonstrate that the model effectively captures significant mechanical performance of warm frozen soil, including strain soft and dilatancy phenomena under various confining pressure conditions. Furthermore, the proposed model enables the prediction of freezing temperature, unfrozen water saturation, unfrozen water pressure, ice pressure, and porosity changes in warm frozen silt samples during the loading process.

中文翻译：

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基于孔隙力学的温冻土宏观细观本构模型

本文提出了基于孔隙力学的宏观细观本构模型的建立，用于研究温冻土的力学。考虑温冻土的压力融化特性，温冻土的弹性参数受加载过程中含冰量变化的影响。通过孔隙力学和细观力学的集成，建立了结合压力熔融效应的宏观细观本构模型来表征温冻土的力学特性。该模型建立了温冻土细观和宏观尺度上的弹性模量之间的关系。为了验证该模型，将模型预测与从温冻粉土获得的实验数据进行了比较。结果表明，该模型有效地捕捉了温冻土的重要力学性能，包括各种围压条件下的应变软和剪胀现象。此外，所提出的模型能够预测加载过程中温冻淤泥样品的冻结温度、未冻结水饱和度、未冻结水压力、冰压力和孔隙率变化。