In order to examine the possibility of applying the φu=0 analysis to the long-term stability problem, experimental studies on the strength of overconsolidated clays were performed. Triaxial compression tests were conducted on four saturated　marine clays, in which the specimen was allowed to rebound under an isotropic or anisotropic confining pressure before shear.
　In spite of a considerable difference in index properties, three undistrubed clays showed similar patterns of strength reduction due to the isotropic rebound. The stress anisotropy was found to have some infulence on the strength reduction due to rebound. It was also shown that the secant modulus of stress-strain curve decreases with the overconsolidation ratio.