Study on the thermal conductivity model of sodium sulfate soils

ABSTRACT

Saline soils is porous medium whose thermal conductivity is affected by components and particle shape. However, the particle shapes in geomaterials are various, and the component and its content are in dynamic change as the soil varies between unfrozen and frozen state. In this study, based on the theory of multi-phase medium mixed geothermal conductivity, a new model is developed to explore the dynamic variation characteristics of the thermal conductivity of sulfate soils. The developed model is validated by comparing the experimental results against the calculated ones. Compared with the other two models, the new model is more reasonable and effective, especially in low temperature.

KEYWORDS:

• Sodium sulfate soil
• thermal conductivity
• soil particle shape
• unfrozen water content
• salt crystal

Acknowledgments

This research was supported by the National Natural Science Foundation of China (41601068), Young Scholars Development Fund of SWPU (201599010104), Scientific Research Starting Project of SWPU (2015QHZ025), Study on Road Engineering Characteristics and Construction Technology of Southwest Red-Mudstone Area in China, (KYY2019140(19-20)).

Additional information

Funding

This work was supported by the Young Scholars Development Fund of SWPU [201599010104];Scientific Research Starting Project of SWPU [2015QHZ025];National Natural Science Foundation of China [41601068];Study on Road Engineering Characteristics and Construction Technology of Southwest Red-Mudstone Area in China [KYY201914019-20];