Research interest in the temperature effect on the permeability of unsaturated soils is growing as a result of an increasing number of geomechanical problems involving thermal effects

such as high-level nuclear waste disposal

buried heat-supply pipelines and high-voltage cables. Based on the research of temperature effects on soil-water characteristic curve (SWCC) of unsaturated soils

an indirect method for predicting permeability coefficients of unsaturated soils at different temperatures is presented. by using the method of relative permeability coefficients from the SWCCs. The new expressions are made for the entire suction range of SWCC; and hence it has a broader applicability. Based on the experiments of MX-80 bentonite and loess

model predictions of relative permeability coefficient at different temperatures with suctions are made

which show satisfactory results.