Abstract In the study, a three-parameter model was presented to calculate the thermal conductivity at full range of degree of saturation (S) for fine-grained soils based on the Fredlund and Xing model and the normalized thermal conductivity method. Three parameters (a, b, c) of the new model are determined by two equations and a measured point at a certain S. Two equations were obtained by the correlations between the parameters a, b, c and the basic properties of 30 Canadian soils by regression analysis. Moreover, the relationship between the thermal conductivity and S at full range of S was defined as the thermal conductivity curve (TCC) and was divided into 3 regions for the improvement of the calculation result. According to the sensitivity analysis, it is found that the calculated TCC is the most reliable when a point is measured in the Region 2. In addition, the new calculation model was also verified by 6 Chinese soils, suggesting the new model could present a good calculation result (R2 = 0.97) for the TCC.

中文翻译：

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一种确定细粒土导热系数的新模型

摘要 在研究中，基于Fredlund和Xing模型和归一化热导率方法，提出了一种三参数模型来计算细粒土在全饱和度（S）范围内的热导率。新模型的三个参数（a、b、c）由两个方程和某个S处的一个测量点确定。 两个方程由参数a、b、c与30个加拿大土壤基本性质的相关性得到通过回归分析。此外，为了改进计算结果，将热导率与 S 在全范围 S 的关系定义为热导率曲线 (TCC) 并分为 3 个区域。根据敏感性分析，