On stress state variables of unsaturated soils

By Qin Bing. 2012

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Resilient Modulus for Unsaturated Unbound Materials (2011, background): “…modulus models that consider suction as predictive variable Fredlund et al. (1977), made an attempt to relate the modulus of a compacted subgrade to the stress state variables for unsaturated soils proposed by Fredlund and Began in the same year (Fredlund et al., 1977; Fredlund and Began, 1977).”
The effects of technological voids on the hydro-mechanical behaviour of compacted bentonite-sand mixture (2013, methodology): “the validity of effective stress in unsaturated soils, it was preferred to use the independent variables approach involving the vertical net stress (sv–ua) and suction (s1⁄4uw–ua), (Coleman, 1962; Fredlund and Morgenstern, 1977; Gens, 1996).”
Generalized plasticity state parameter‐based model for saturated and unsaturated soils. Part II: Unsaturated soil modeling (2011, background): “This led Bishop and Blight [7] to introduce the so-called ‘bi-tensorial’ formulations [8, 9] based on the net stress and the matric suction tensors which have been widely used later on.”