Thermal conductivity is an important reference index to measure the thermal performance of raw soil materials.By means of theoretical analysis,experimental measurement and theoretical model verification,the thermal conductivity of dry raw soil test blocks with different densities and different soil-sand ratios is measured and compared with the theoretical calculation results.The results show that the density is positively correlated with the thermal conductivity of raw soil materials with different soil sand ratios.The soil sand content has a certain influence on the thermal conductivity of the raw soil test block.The reasonable soil sand ratio can effectively reduce the thermal conductivity of the raw soil test block.When the soil content is 46%and the sand content is 38%,the raw soil material has ideal thermal performance.Based on the theory of thermal conductivity of composite materials,a prediction model of soil sand content-thermal conductivity is established.The average error between the test results and the model calculation results is about 9%,and the data are in good agreement.The relevant conclusions reveal the relationship between density and soil sand content and the thermal conductivity of raw soil materials,which provides theoretical guidance for the quantitative calculation of the thermal performance of raw soil materials.
soil materialthermal conductivitydensityproportioning of sand and soilthermal conductivity model
NETL
NSTL
万方数据
