**Gori Fabio, 1983: A theoretical model for predicting the effective thermal conductivity of unsaturated frozen soils. International Conference on Permafrost, Proceedings 4(Pages 363-368**

The model assumes the soil as a cubic space with a centered cubic solid grain. The hypotheses of parallel isotherms and heat flux lines in the determination of the effective thermal conductivity are discussed. The comparison with several experimental results on saturated two-phase media indicates that the assumption of parallel isotherms gives a good agreement. The unsaturated frozen soils are investigated taking into account phenomena of adsorption and capillarity. The predictions of the present model are finally compared with experimental data on unsaturated frozen soils available in the literature. The model gives better agreement to the data than that found using the expressions of Johansen and Frivik (1980) and the electrical conductivity analogy of De Vries (1963). Some characteristics results are presented for soils studied by Kersten (1949) and Penner et al. (1975).–Journal abstract.

**Tags:**capillarity, johansen, kersten, penner, vries