In recent years, with the development of geothermal resources, the thermal conductivity of soil has become a research hotspot. In this study, the thermal conductivity measured by the transient plane heat source method was used to evaluate five common thermal conductivity models from the previous literature. The influences of water content and salt content on the internal heat transfer mode of this soil are explored. It was found that the presence of water in soil changes the conventional mode of point-to-point heat transfer between solid soil particles. With increases in water content, “liquid bridges” are formed between particles. During their formation, NaCl brine can transfer heat in a similar way to water. In this experiment, the model of Usowicz et al. (Intern J Heat Mass Transfer 57:536–571, 2006) was found to best describe the thermal conductivity of soil with salt contents of 0%, 2%, 4% and 6%. This study provides a valuable reference for the development of geothermal resources in the Guanzhong area and for engineering projects in loess areas.

近年来，随着地热资源的发展，土壤的热导率已成为研究的热点。在这项研究中，通过瞬态平面热源法测量的热导率被用于评估来自先前文献的五个常见的热导率模型。探讨了水分和盐分含量对土壤内部传热模式的影响。发现土壤中水的存在改变了固体土壤颗粒之间点对点传热的常规模式。随着水含量的增加，颗粒之间形成“液桥”。在形成过程中，NaCl盐水可以与水类似的方式传递热量。在这个实验中，Usowicz等人的模型。（实习生J热传质57：536–571，2006）被发现最能描述含盐量为0％，2％，4％和6％的土壤的热导率。该研究为关中地区地热资源的开发和黄土地区的工程项目提供了有价值的参考。