With increasing engineering projects carried out in cold regions, the analysis and evaluation of the thermal conductivity and electrical resistivity of frozen soil have become important considerations in engineering construction and theoretical research. Through experiments performed on silty clay, the effects of the initial water content and soil temperature on the thermal conductivity and electrical resistivity of silty clay soil were analyzed. Theoretical models were also formulated for the soil thermal conductivity and electrical resistivity. The results showed that the variations in the thermal conductivity and electrical resistivity can be discussed as three stages: the freezing prophase, freezing metaphase and freezing anaphase. The electrical resistivity increases rapidly in the temperature range − 2 °C to −6 °C. The thermal conductivity increases rapidly from −2 °C to −4 °C and then decreases slightly from −4 °C to −6 °C due to the development of frost heave cracks in samples with higher water contents (15%, 18% and 20%). However, the thermal conductivity of samples with a water content of 10% continues to increase under these conditions. At the same temperature, the thermal conductivity increases linearly with water content in general. The electrical resistivity decreases approximate linearly with water content from 10 °C to −4 °C and increases with increasing water content from −4 °C to −20 °C. The thermal conductivity is inversely proportional to electrical resistivity from 10 °C to −4 °C and is proportional to electrical resistivity from −10 °C to −20 °C. The results of the experiments performed on silty clay soil verify the soundness of the proposed model for the thermal conductivity and electrical resistivity of unfrozen and frozen soil.

随着寒冷地区工程项目的增多，对冻土的导热系数和电阻率的分析和评价已成为工程建设和理论研究的重要考虑因素。通过对粉质粘土的试验，分析了初始含水量和土壤温度对粉质粘土热导率和电阻率的影响。还建立了土壤热导率和电阻率的理论模型。结果表明，热导率和电阻率的变化可以分为三个阶段：冻结前期，冻结中期和冻结后期。在− 2°C至-6°C的温度范围内，电阻率迅速增加。导热系数从-2°C迅速增加到-4°C，然后从-4°C稍微降低到-6°C，这是由于含水量较高（15％，18％和20％）。但是，在这些条件下，含水量为10％的样品的热导率继续增加。在相同温度下，导热系数通常随水含量线性增加。电阻率随着水含量从10°C到-4°C近似线性下降，并且随着水含量从-4°C到-20°C增大而增加。导热率与10°C至-4°C的电阻率成反比，并且与-10°C至-20°C的电阻率成正比。