The shear-volume coupling of water-plwiated sands is investigated using data from drained stress path tests where changes of principal effective stress ratio and/or rotation of principal stresses have been imposed. The results indicate that the shear-induced volumetric strain response is mainly governed by the direction of major principal stress increment. The gradient of the strain path remains essentially constant for loadings where the stress increment direction is not applied at steep angles to the (vertical) direction of particle deposition. This gradient is increased significantly when the stress increment is applied at steep angles to the vertical. The association of the gradients of stress increments and strain increments, and the linearity of strain paths, observed at small strain levels under triaxial compression appears to be valid for loadings involving principal stress rotation, provided the stress increment directions are not inclined at steep angles to the direction of panicle deposition.
展开▼
