Abstract
To investigate the undrained shear strength anisotropy of K0-consolidated cohesive soils, undrained triaxial compression and extension tests with K0-consolidated and K0-rebound were performed on two kinds of cohesive soils. As a result, the undrained shear strength anisotropy is approximately constant within the range of OCRs of 1 to 10. The reason for this may be considered that the inherent structual anisotropy in a soil specimen produced during initial K0-consolidation history before rebound is essentially maintained during swelling. The constant undrained shear strength anisotropy, however, seems to depend on the amount of clay fraction and plasticity index of the soils.
