UNDRAlNED SHEAR CHARACTERISTICS OF SATURATED SAND UNDER ANISOTROPIC CONSOLIDATION

 SUSUMU KATO, KENJI ISHIHARA and IKUO T0WHATA

ABSTRACT: A series of undrained triaxial compression tests was performed on Toyoura sand in order to investigate the behavior of sand under large deformation. The present study focuses on the effects of anisotropic consolidation on the undrained behavior of sand. A wide range of initial states of sand is covered and taken into account with the behavior of sand varying from contractive to dilative. Different states of consolidation stress were shown to affect the stress-strain behavior of sand and the development of excess pore water pressure up to an axial strain of 5%. Beyond a strain in excess of 10%, the behavior of sand was shown to become independent of the stress state at consolidation. Consequently, the relation between void ratio and confining stress at steady state and quasi-steady state are independent of the extent of anisotropic consolidation. Moreover, the initial dividing curve between dilative and contractive behaviors in an e-p' diagram was shown to move down as the sand is more anisotropically consolidated. 

Key words: anisotropic consolidation, sand, steady state, triaxial compression test, undrained shear (IGC: D6/D3)