Static liquefaction of sands under multiaxial loading

Abstract

A fundamental study of the undrained behaviour of sands under multiaxial loading is presented. The investigation was carried out using Fraser River and Syncrude sands in a hollow cylinder torsional shear device. Shear loading was carried out under strain control to capture the postpeak strain-softening characteristics of loose sands. It is shown that the undrained response of loose sands is highly dependent on the loading direction. The friction angle mobilized at phase transformation and steady state is a unique material property, independent of the mode of loading, direction of principal stress and initial consolidation stress, and void ratio state. There is no unique relationship between steady state strength and void ratio which is independent of stress path and the level of initial confining stress.Key words: anisotropy, hollow cylinder torsional shear, liquefaction, sand, simple shear, triaxial.

Effect of Non Plastic Silt on the Anisotropic Behavior of Sand

“…On the other hand, in the case of a＝759 , pore water pressure ratio developed up to nearly 90z and there was a strong strain softening in behavior. The same results have been reported by Uthayacumar and Vaid (1998) and Sivathayalan and Vaid (2002). The considerable dependence of the sand behavior to the inclination of principal stresses indicates the inherent anisotropy in the material due to the soil particle arrangement.…”

“…Many tests by hollow cylindrical torsional shear (HCTS) apparatus have been performed to prove the eŠect of anisotropy in the behavior of sands (Symes et al, 1984;Sivathayalan and Vaid, 2002;Nakata et al, 1998;Uthayakumar and Vaid, 1998). Most natural sands have anisotropic strength and deformation characteristics (Saada, 1988).…”

State-of-the-art of geotechnical earthquake engineering practice

“…Uthayakumar and Vaid [44] and Yoshimine et al [45] have explored the effects of stress path on residual strength over a wide range of stress paths de®ned by a , the inclination of the principle stress to the vertical axis of the sample, and the parameter b s 2 2 s 3 = s 1 2 s 3 ; which is a measure of the intermediate principle stress. The samples were tested using the hollow cylinder torsional shear device.…”

Constitutive modelling of fabric anisotropy in sand

“…Proper consideration of the effect of fabric is important for safe design and maintenance of relevant key infrastructures (Uthayakumar & Vaid 1998).…”