基于刚性冰假定和水动力学模型,将土体视为弹性体,建立了考虑应变对水分迁移影响的饱和土冻结过程中水-热-力的耦合动力学模型,利用有限元法和差分法对饱和土冻结过程中水-热-力的耦合作用进行了数值研究,给出了冻土中含水量和应力沿高度的分布规律,讨论了冻结时间、温度边界条件对冻土中含水量分布及应力分布的影响。研究结果表明:受土体冻结过程中水分向冻结锋面附近迁移的影响,冻结锋面附近的含水量逐渐增加,引起该处应力逐渐增大,从而导致土体发生冻胀变形。 Based on the assumption of rigid ice and the hydrodynamic model, the soil is regarded as the elastic body, and the coupled water-thermal-mechanical coupling model of saturated soil is established considering the effect of strain on the moisture migration. By using the finite element method and the difference method The numerical study on the coupling of water-heat-force in saturated soil freezing process was conducted. The distribution of moisture content and stress along the height of frozen soil was given. The influence of freezing time and temperature on the distribution of water content in frozen soil And the impact of stress distribution. The results show that the water content around the frozen front increases gradually due to the moisture migration to the freezing front near the frozen ground, which causes the stress to increase gradually, resulting in the frost heave deformation of the soil.