Advances in modelling hysteretic water retention curve in deformable soils

Nuth, Mathieu; Laloui, Lyesse

doi:10.1016/j.compgeo.2008.08.001

Cited by 233 publications

(148 citation statements)

References 14 publications

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“…The water retention curve expressed in terms of water content or degree of saturation and suction is hysteretic, stress path dependent (void ratio) and depends on the pore network [1,10,16,18,19,21,23,25,27,28,31]. To properly describe its evolving water retention character, a multimodal retention model is proposed in the paper by considering a linear superposition of two subcurves of the van Genuchten [33] type.…”

Section: Introductionmentioning

confidence: 99%

Consequences on water retention properties of double-porosity features in a compacted silt

et al. 2012

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Section: Introductionmentioning

confidence: 99%

Consequences on water retention properties of double-porosity features in a compacted silt

et al. 2012

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“…Such influence of mechanical behaviour on the water retention has been observed and discussed in a large number of experimental tests (e.g. [15, 52-55, 68, 78]) and is often represented in a model by a shift of the main wetting and main drying retention curves to higher values of suction when the void ratio decreases ( [25,36,43,49,61,62,74], among others). The experimental data investigated in Tarantino [68] shows that not only should this shift affect the unsaturated part of the water retention response, but it should also have some influence on the values of suction at which de-saturation and saturation are predicted (i.e.…”

Section: Saturation and De-saturation Linesmentioning

confidence: 99%

From saturated to unsaturated conditions and vice versa

et al. 2017

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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 airexclusion 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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“…One major characteristic of unsaturated soils is the soil water retention curve (SWRC), which specifies capillary pressure value associated with the water saturation degree. In recent years, experimental evidences have clearly shown that soil water retention curves are dependent on the stress level (Romero and Vaunat 2000;Karube and Kawai 2001;Gallipoli et al 2003b;Tarantino and Tombolato 2005;Nuth and Laloui 2008;Tarantino 2009;Uchaipichat 2010). Tarantino (2009) has considered the dependency of air entry value on stress level and has offered a SWRC equation for deformable media.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Salager et al (2010Salager et al ( , 2013 experimentally studied the void ratio dependency of retention curves and introduced the water retention surface, which clearly illustrates the change of saturation degree-capillary pressure relationship caused by a change in void ratio. Nuth and Laloui (2008) proposed a constitutive relationship between air entry value and void ratio as well as the elasto-plastic analogy in the degree of saturation versus capillary pressure relationship (an analogy with mechanical hysteresis) to model hysteretic water retention curves in deformable soils. By means of an empirical equation for the effective stress, Masin (2010) formulated and investigated the void ratio dependency of degree of saturation for various capillary pressure values.…”

Section: Introductionmentioning

confidence: 99%

Bridging Effective Stress and Soil Water Retention Equations in Deforming Unsaturated Porous Media: A Thermodynamic Approach

2017

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The finite deformation of an unsaturated porous medium is analysed from first principles of mixture theory. An expression for Bishop's effective stress is derived from (1) the deformation-dependent Brooks and Corey's water retention curve and (2) the restrictions on the constitutive relationships of an unsaturated medium subject to finite deformation. The resulting expression for the effective stress parameter χ is reasonably consistent with experimental data from the literature. Hence, it is shown that Bishop's equation is constitutively linked to water retention curves in deforming media.Keywords Porous medium · Wetting fluid · Non-wetting fluid · Saturation List of symbols

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Advances in modelling hysteretic water retention curve in deformable soils

Cited by 233 publications

References 14 publications

Consequences on water retention properties of double-porosity features in a compacted silt

Consequences on water retention properties of double-porosity features in a compacted silt

From saturated to unsaturated conditions and vice versa

Bridging Effective Stress and Soil Water Retention Equations in Deforming Unsaturated Porous Media: A Thermodynamic Approach

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