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冻土路基中水、热随气候的变化是不均匀的 ,由此引起的土性变化也是不均匀的 ,土性的不均匀变化导致路基不均匀变形 ,当路基中的不均匀变形超过容许值时 ,路基便产生破坏 ,冻土路基土性的动态变化及由此引起的变形差异 ,是冻土路基设计中应注意的关键问题。基于此 ,在现有土力学弹塑性理论和流变理论的基础上 ,模拟水、热及土性的动态变化 ,建立了冻土路基应力及变形的二维数值模型 ,模型考虑了冻土的流变变形、自身体积变形和瞬时变形 ,重点考虑了土性变化情况下土的流变变形和瞬时变形特征
The change of water and heat in the permafrost subgrade is not uniform with the change of climate, and the change of the soil property is also non-uniform. The non-uniform change of the soil leads to the uneven deformation of the subgrade. When the uneven deformation in the subgrade exceeds the allowable value , The subgrade will be damaged. The dynamic change of soil subgrade and the deformation caused by it are the key issues that should be paid attention in the design of permafrost embankment. Based on this, based on the existing elasto-plastic theory and rheological theory of soil mechanics, the dynamic changes of water, heat and soil properties are simulated and the two-dimensional numerical model of stress and deformation of permafrost subgrade is established. The model takes the frozen soil Rheological deformation, self-volume deformation and instantaneous deformation, with emphasis on the rheological deformation and transient deformation characteristics of soil under the change of soil properties