Abstract: A series of oedometer tests under different values of constant vertical net stress have been undertaken by by Alonso et al. To verify the test results presented by Farulla et al., two kinds of tests for overconsolidated unsaturated clays w Farulla et al. to investigate the behavior of overconsolidated unsaturated clays during wetting. It is shown in the experimental data that the volume change induced by wetting varies with the vertical net stress, which is not exactly the same as the assumption proposed ere carried out using the double-cell triaxial system. One is a series of tests to investigate the effect of overconsolidation degree on wetting behavior under the same preconsolidation pressure. The other is the triaxial drained tests under a certain suction to study the behavior of deformation and strength of overconsolidated unsaturated clays. The results of the experiments confirm the verification of the interpretation by Farulla et al. Moreover, the behavior of overconsolidated unsaturated clays under wetting paths observed in the experiments is modeled by the UH model.

Key words: unsaturated clays, suction, overconsolidation, softening, wetting, triaxial test