Drained and undrained elastic moduli of reconstituted clay

The behavior of elastic stiffness involved with strains less than 10(-5) was examined over a wide stress range when a reconstituted clay is subjected to drained and undrained shear. The tests were carried out by using a fully automated triaxial apparatus equipped with bender elements. The drained/undrained elastic Young's moduli in the vertical direction, (E-v)(d) and (E-v)(u) from stress-strain relationship, together with the elastic shear modulus, G(vh), from shear wave velocity measurement using bender elements, were each successfully characterized in terms of the current stress as well as the stress history. Interrelationship among (E-v)(d), (E-v)(u), and G(vh) was also discussed, bearing the stiffness anisotropy at small strains in mind.