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在低含水率非饱和土模型的基础上,从冻土物理特性出发,只考虑毛细吸力和附加压力的作用,建立了非饱和高温冻土细观结构模型,并结合相关实验数据资料改进了高温冻土未冻水含量的经验关系式,基此推导出孔隙水压力、有效应力以及抗剪强度随温度、含水量的变化关系.同时,通过理论计算与实验(实测)结果进行对比分析,发现本模型能够很好地反映非饱和高温冻土的相关物理力学特性,尤其在定性上能够与宏观实测结果相吻合.最后,基于非饱和高温冻土微观模型,对非饱和高温冻土的有效应力、抗剪强度进行了讨论分析,给出了合理的理论解释,并对高温冻土相关物理力学特性做出了定性的理论预测.
Based on the low water content unsaturated soil model, considering the physical properties of frozen soil, only considering the capillary suction and additional pressure, the mesostructure model of unsaturated high temperature frozen soil was established, and the relevant experimental data were used to improve the high temperature Based on the empirical relationship between the water content and the unfrozen water content in frozen soil, the relationship between pore water pressure, effective stress and shear strength with temperature and water content was deduced based on the results of theoretical calculation and experimental (measured) The model can well reflect the relevant physical and mechanical properties of unsaturated permafrost, especially in qualitatively agree with the macro-measured results.Finally, based on the microscopic model of unsaturated high-temperature permafrost, the effective stress of unsaturated soils , Shear strength are discussed and analyzed, a reasonable theoretical explanation is given, and the qualitative and theoretical prediction of the physical and mechanical properties of the permafrost is made.