Adaptation of existing behaviour models to unsaturated states: application to CJS model

Pereira, Jean‐Michel; Wong, Henry; Dubujet, Philippe; Dangla, Patrick

doi:10.1002/nag.453

Cited by 62 publications

(61 citation statements)

References 19 publications

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“…Studies of interest in this field are Dangla and Coussy [33] followed by Pereira et al [48]. As demonstrated previously, authors write the effective stress as follows, keeping the notations from Section 4.3.1:…”

Section: Effective Stresses Of Categorymentioning

confidence: 99%

Effective stress concept in unsaturated soils: Clarification and validation of a unified framework

Nuth¹,

Laloui²

2007

Num Anal Meth Geomechanics

431

243

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SUMMARYThe effective stress principle, conventionally applied in saturated soils, is reviewed for constitutive modelling purposes. The assumptions for the applicability of Terzaghi's single effective stress are recalled and its advantages are inventoried. The possible stress frameworks applicable to unsaturated soil modelling are reassessed in a comparative manner, specifically the Bishop's single effective stress, the independent stress variables approach and the generalized stress framework. The latter considerations lead to the definition of a unified stress context, suitable for modelling soils under different saturation states. In order to qualify the implications brought by the proposed stress framework, several experimental data sets are re-examined in the light of the generalized effective stress. The critical state lines (CSLs) at different saturation states tend to converge remarkably towards a unique saturated line in the deviatoric stress versus mean effective stress plane. The effective stress interpretation is also applied to isotropic paths and compared with conventional net stress conception. The accent is finally laid on a second key feature for constitutive frameworks based on a unified stress, namely the sufficiency of a unique mechanical yield surface besides the unique CSL.

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Section: Effective Stresses Of Categorymentioning

confidence: 99%

Effective stress concept in unsaturated soils: Clarification and validation of a unified framework

Nuth¹,

Laloui²

2007

Num Anal Meth Geomechanics

431

243

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“…where  (0≤≤) is the microscopic Bishop parameter which can be expressed as a function of saturation, for example according to [13]. In addition,  is the macroscopic Biot coefficient defined in a classical way by 1/…”

Section: Isotropic Form Of the Multi-scale Modelmentioning

confidence: 99%

Application of a Multi-Scale form of Terzaghi’s Effective Stress Principle for Unsaturated Expansive Clays to Simulate Hydro-Mechanical Behavior During Hydration

et al. 2016

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Abstract.Our recently developed multi-scale form of Terzaghi's effective stress principle for unsaturated swelling clays that was rigorously derived by periodic homogenization starting from micro-and nano-mechanical analyses is applied to numerically simulate one-dimensional swelling pressure tests of compacted bentonites during hydration. The total macroscopic stress captures the coupling between disjoining forces at the nanoscopic scale of clay platelets and capillary effects at the microscopic scale of clay aggregates over the entire water content range. The numerical results allow to draw conclusions on the water transfer mechanism between inter-and intra-aggregate pores during hydration and consequently on the evolution of the external swelling pressure resulting from the competition between capillary and disjoining forces. In addition, such application highlights the abilities and the limits of the electrical double-layer theory to compute the disjoining pressure in the nano-pores. For large platelet distances, in the range of osmotic swelling, the nature of the disjoining pressure is electro-chemical and can be computed from PoissonBoltzmann theory. Conversely, at small distances, in the crystalline swelling, a solvation component has to be added to account for the molecular nature of the solvent. As a first improvement of the nano-scale description the solvent is treated as a hard sphere fluid using Density Functional Theory.

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“…saturated soils (e.g. Khalili 2000&2002;Pereira et al 2005;Gray and Schrefler 2001;Nikooee et al 2013;Borja & Koliji 2009), we wish to explore an alternative path in this paper. The key idea is to (i) observe the micromechanics, (ii) propose an abstract representation of the observed micromechanisms, and then (iii) embed them in a constitutive model.…”

Section: School Of Civil Engineering University Of Sydneymentioning

confidence: 99%

A multiphase constitutive modeling framework for unsaturated soil behavior

Nguyen¹,

Gan²

2014

Unsaturated Soils: Research &Amp; Applications

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Adaptation of existing behaviour models to unsaturated states: application to CJS model

Cited by 62 publications

References 19 publications

Effective stress concept in unsaturated soils: Clarification and validation of a unified framework

Effective stress concept in unsaturated soils: Clarification and validation of a unified framework

Application of a Multi-Scale form of Terzaghi’s Effective Stress Principle for Unsaturated Expansive Clays to Simulate Hydro-Mechanical Behavior During Hydration

A multiphase constitutive modeling framework for unsaturated soil behavior

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