Abstract
Cyclic Undrained Triaxial Tests were carried out, after performing K0-consolidation to fine containing sands, which had diferrent fine content (Fc) and fixed initial relative density. Consequently, it turned out that, as for the size relation between the initial shear stress and the amplitude of cyclic shear stress, the behavior of K0-consolidated sandy soil were classified into liquefaction, cyclic softening, and no-failure. And the result of arranging these behaviors using the index (SRR), which indicated the degree of the reversal to the extension side of cyclic shear stress, produced that SRR was by the volume of Fc. Furthermore, it turned out that the failure form according to the specified number of cycles, in the relation between cyclic shear stress ratio and number of cycles, was classified as liquefaction or cyclic softening by Fc, and changed the treatment of liquefaction strength evaluation.
