Abstract
Soil consists of three phases that show significantly different thermal conductivity. The overall thermal conductivity depends not only on the phase composition but also the geometry. In this study, we made a 3-dimensional porous material model with a micro structure of the soil, and estimated the macroscopic thermal conductivity of the model by un upscaling heat conduction analysis. On the other hands, we carried out laboratory experiments aiming to estimate soils thermal conductivity by using column specimens of water content soil. Finally we verified the validity of the numerical model by comparing the experimental results with the numerical ones.
