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热物性参数是冻土路基温度场稳定性分析和评价最重要的一类参数,确定这类参数主要有室内试验、现场试验以及基于实测资料的反演分析等方法。文中建立冻土路基相变温度场的参数反分析模型,以青藏公路高温冻土路基为例,采用单因素分析法对路基填土、最大融化深度内地基土和多年冻土的热物性参数的敏感性进行分析与评价。结果表明:最大融化深度内的地基土的体积热容量和冻结状态的导热系数等参数敏感性最强,填土和最大融化深度内的地基土的相变潜热等为较敏感参数,而各土层融化状态的导热系数等为不敏感参数。研究结果可作为冻土路基温度场参数选取和反演的参考依据。
Thermophysical parameters are the most important parameters in the stability analysis and evaluation of the temperature field of frozen soil embankment. The main parameters of this kind of method are indoor test, field test and back analysis based on measured data. In this paper, a parametric back analysis model for the temperature field of the permafrost subgrade is established. Taking the permafrost subgrade in Qinghai-Tibet Highway as an example, the thermal parameters of subgrade soil, Sensitivity analysis and evaluation. The results show that the volume heat capacity of foundation soil and the thermal conductivity in frozen state are the most sensitive, and the latent heat of foundation soil in filling and maximum melting depth are more sensitive parameters. However, Melting state of the thermal conductivity as insensitive parameters. The results can be used as a reference basis for the selection and inversion of temperature field parameters of frozen soil subgrade.