From saturated to unsaturated conditions and vice versa.
Martí Lloret-Cabot,Martí Lloret-Cabot,Simon J. Wheeler,Jubert Pineda,Enrique Romero,Daichao Sheng +5 more
TL;DR: The Glasgow Coupled Model (GCM) as mentioned in this paper is a coupled elasto-plastic constitutive model covering both mechanical and retention behaviour, which represents transitions between unsaturated and saturated behaviour in a consistent fashion.
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Abstract: Representing transitions between saturated and unsaturated conditions, during drying, wetting and loading paths, is a necessary step for a consistent unification between saturated and unsaturated soil mechanics. Transitions from saturated to unsaturated conditions during drying will occur at a nonzero air-entry value of suction, whereas transitions from unsaturated to saturated conditions during wetting or loading will occur at a lower nonzero air-exclusion value of suction. Air-entry and air-exclusion values of suction for a given soil will differ (representing hysteresis in the retention behaviour) and both are affected by changes in the dry density of the soil or by the occurrence of plastic volumetric strains. The paper demonstrates, through model simulations and comparison with experimental data from the literature (covering drying, wetting and loading tests), that the Glasgow Coupled Model (GCM), a coupled elasto-plastic constitutive model covering both mechanical and retention behaviour, represents transitions between unsaturated and saturated behaviour in a consistent fashion. Key aspects of the GCM are the use of Bishop’s stress tensor for mechanical behaviour, the additional influence of degree of saturation on mechanical yielding, inclusion of hysteresis in the retention behaviour, and the role of plastic volumetric strains (and not total volumetric strains) in the description of the water retention response. The success of the GCM in representing consistently transitions between saturated and unsaturated conditions, together with subsequent mechanical and retention responses, demonstrates the potential of this coupled constitutive model for numerical modelling of boundary value problems involving saturated and unsaturated conditions.
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Citations
Estimation of unsaturated shear strength from soil–water characteristic curve
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TL;DR: In this article, an alternative method to couple the hydraulic component with the mechanical component in a constitutive model for unsaturated soils is presented, which is based on hydromechanical coup...
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Ronaldo I. Borja,Joshua A. White +1 more
TL;DR: In this paper, a physics-based framework for continuum modeling of a hydrologically driven slope failure similar to what occurred in a steep experimental catchment CB1 near Coos Bay, Oregon is presented.
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Mathematical framework for unsaturated flow in the finite deformation range
Xiaoyu Song,Ronaldo I. Borja +1 more
TL;DR: In this paper, a mathematical framework for coupled solid-deformation/fluid-diffusion in unsaturated porous material considering geometric nonlinearity in the solid matrix is presented, which relies on the continuum principle of thermodynamics to identify an effective or constitutive stress for a solid matrix, and a water-retention law that highlights the interdependence of the degree of saturation, suction, and porosity of the material.
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