A bounding surface hysteretic water retention model for deformable soils

Gallipoli, Domenico; Bruno, AW; D'Onza, F.; Mancuso, Claudio

doi:10.1680/jgeot.14.p.118

Cited by 47 publications

(18 citation statements)

References 23 publications

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“…The auxiliary stress ̅ of Equation ( 6) is here named the "scaled stress" because of its ability of taking into account the effect of capillarity on mechanical behaviour by scaling the average skeleton stress with a power function of degree of saturation. This is analogous to the water retention model of Gallipoli et al (2015) where the "scaled suction" ̅ was defined by factoring the soil suction with a power function of void ratio to take into account the effect of deformation on retention behavior. The scaled stress can therefore be regarded as the mechanical dual of the scaled suction in the hydraulic model of Gallipoli et al (2015).…”

Section: Unified Normal Compression Line For Saturated and Unsaturated Soilsmentioning

confidence: 99%

A bounding surface compression model with a unified virgin line for saturated and unsaturated soils

Gallipoli

Bruno

2017

Géotechnique

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Section: Unified Normal Compression Line For Saturated and Unsaturated Soilsmentioning

confidence: 99%

A bounding surface compression model with a unified virgin line for saturated and unsaturated soils

Gallipoli

Bruno

2017

Géotechnique

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“…In addition, as explained in Introduction, it is of great interest to include in the analysis the effect of the variation in the void ratio on the soil retention behaviour. For this purpose, the formulation proposed by Gallipoli et al [17,18] and Gallipoli [16] for a single porosity retention model (SPRM) is taken as a reference model: Jacinto [24] 1600…”

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confidence: 99%

“…For comparison, the single porosity retention model of Gallipoli et al [17], Eq. (5), was also calibrated against the same experimental data, in Fig.…”

Section: Model Descriptionmentioning

confidence: 99%

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A water retention model accounting for void ratio changes in double porosity clays

et al. 2021

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This paper presents a constitutive model that predicts the water retention behaviour of compacted clays with evolving bimodal pore size distributions. In line with previous research, the model differentiates between the water present inside the saturated pores of the clay aggregates (the microstructure) and the water present inside the pores between clay aggregates (the macrostructure). A new formulation is then introduced to account for the effect of the macrostructural porosity changes on the retention behaviour of the soil, which results in a consistent evolution of the air-entry value of suction with volumetric deformations. Data from wetting tests on three different active clays (i.e. MX-80 bentonite, FEBEX bentonite, and Boom clay), subjected to distinct mechanical restraints, were used to formulate, calibrate, and validate the proposed model. Results from free swelling tests were also modelled by using both the proposed double porosity model and a published single porosity model, which confirmed the improvement in the predictions of degree of saturation by the present approach. The proposed retention model might be applied, for example, to the simulation of the hydromechanical behaviour of engineered bentonite barriers in underground nuclear waste repositories, where compacted active clays are subjected to changes of both suction and porosity structure under restrained volume conditions.

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“…Early retention models postulate a relationship between the degree of saturation (or equivalently the gravimetric * email: alejandro.lopez@deusto.es or volumetric water content) and the capillary pressure [8,9]. More recent models have incorporated the influence of hydraulic hysteresis and material deformation on the variation of the degree of saturation of granular and porous media [10][11][12]. More recently, some advanced capillary models have also considered the effect of the pore size distribution and microstructure on the retention behaviour of granular and porous materials [13,14].…”

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confidence: 99%

CFD modelling of the effect of capillary pressure on retention behaviour of water menisci at inter-particle contacts

2021

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This paper presents a Computational Fluid Dynamics (CFD) model on the effect of capillary pressure on the retention behaviour of a granular material. The model proposes an unprecedented CFD insight into the onset of liquid menisci at the inter-particles contact under varying hydraulic conditions. The present work models the material grains as smooth spherical particles that define a porous network filled by two interstitial fluids: air and silicon oil. The numerical model has been subsequently validated against experimental measurements of the degree of saturation at different capillary pressures taken by Dullien et al. [F.A. Dullien, C. Zarcone, I.F. MacDonald, A. Collins, R.D. Bochard. J. Colloid Interface Sci. 127, 2 (1989)] in a system of smooth glass beads flooded with silicon oil. Results from the numerical simulations confirm the good capability of the model to reproduce the experimental retention behaviour of the granular material. Finally, the present paper laid the basis for future CFD studies on the effect of various factors (e.g. hydraulic hysteresis, surface roughness and/or grain shape) on the capillary pressure acting at the interparticle contact.

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A bounding surface hysteretic water retention model for deformable soils

Abstract: A bounding surface hysteretic water retention model for deformable soils.

Cited by 47 publications

References 23 publications

A bounding surface compression model with a unified virgin line for saturated and unsaturated soils

A bounding surface compression model with a unified virgin line for saturated and unsaturated soils

A water retention model accounting for void ratio changes in double porosity clays

CFD modelling of the effect of capillary pressure on retention behaviour of water menisci at inter-particle contacts

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