Predictive Model for the Water Retention Curve of Deformable Clayey Soils

Mbonimpa, Mamert; Aubertin, Michel; Maqsoud, Abdelkabir; Bussière, Bruno

doi:10.1061/(asce)1090-0241(2006)132:9(1121)

Cited by 56 publications

(31 citation statements)

References 48 publications

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“…D 'Onza et al (2010) reviewed recent models for the SWRC featuring density-dependency. In most of the published models (Gallipoli et al 2003;Mbonimpa et al 2006;Nuth and Laloui 2008;Mašín 2010), the degree of saturation is linked to the void ratio through simple relationships that proved to be effective in the range of suction where capillarity predominates (low to moderate suctions). To account for the density-dependency, the following approach is used in these models: one parameter of the SWRC (for instance the air-entry value) is made to depend on the void ratio according to a linear relationship or a power law.…”

Section: Introductionmentioning

confidence: 99%

Investigation into water retention behaviour of deformable soils

et al. 2013

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Abstract:The paper presents an experimental and modelling approach for the soil-water retention behaviour of two deformable soils. The objective is to investigate the physical mechanisms that govern the soil-water retention properties and to propose a constitutive framework for the soil-water retention curve accounting for the initial state of compaction and deformability of soils. A granular soil and a clayey soil were subjected to drying over a wide range of suctions so that the residual state of saturation could be attained. Different initial densities were tested for each material. The soil-water retention curves (SWRCs) obtained are synthesized and compared in terms of water content, void ratio, and degree of saturation, and are expressed as a function of the total suction. The studies enable assessment of the effect of the past and present soil deformation on the shape of the curves. The void ratio exerts a clear influence on the air-entry value, revealing that the breakthrough of air into the pores of the soil is more arduous in denser states. In the plane of water content versus suction, the experimental results highlight the fact that from a certain value of suction, the retention curves corresponding to different densities of the same soil are convergent. The observed features of behaviour are conceptualized into a modelling framework expressing the evolution of the degree of saturation as a function of suction. The proposed retention model makes use of the theory of elastoplasticity and can thus be generalized into a hysteretic model applicable to drying-wetting cycles. The calibration of the model requires the experimental retention data for two initial void ratios. The prediction of tests for further ranges of void ratios proves to be accurate, which supports the adequacy of formulated concepts.Key words: soil-water retention curve, unsaturated soils, deformable media, constitutive modelling. Mots-clés : courbe de rétention d'eau du sol, sols non saturés, médium déformable, modèle constitutif.

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Section: Introductionmentioning

confidence: 99%

Investigation into water retention behaviour of deformable soils

et al. 2013

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“…Some models also use an empirical volume-shrinkage curve together with equation (1) to quantify the effect of initial density on the SWCC. One of the simplest models in this group is perhaps due to Mbonimpa et al (2006), and yet it requires three additional parameters to be specified.…”

Section: Introductionmentioning

confidence: 99%

Modelling the effect of initial density on soil-water characteristic curves

Zhou¹,

Sheng²,

Carter³

2012

Géotechnique

148

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This paper presents a simple approach to quantify the effect of initial soil density on the soil-water characteristic curve (SWCC) of unsaturated soils. This approach is based on an incremental relationship between the degree of saturation and the initial void ratio, which satisfies the intrinsic constraints for three-phase porous materials. The incremental relationship can be incorporated into existing SWCC equations to model the water retention behaviour for deformable soils. Only one additional parameter is introduced, which can be conveniently calibrated by way of conventional water retention tests. The SWCCs for the same soil at different initial void ratios can be found using the proposed approach. The proposed approach is validated against experimental data from drying tests for both compacted and reconstituted soils.

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“…Wheeler et al [7] used a bilinear function between the degree of saturation and the logarithmic modified suction. Mbonimpa et al [8] proposed a modified Kovacs (MK) model which incorporates the void ratio into the relationship between the degree of water saturation and the suction. Marsin [9] used a suction rate as a function of the deformation rate.…”

Section: Introductionmentioning

confidence: 99%

Modelling of the water retention characteristic of deformable soils

et al. 2016

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Abstract.A recently proposed water retention model has been further developed for the application on unsaturated deformable soils. The physical mechanisms underpinning the water retention characteristic of soils was at first described in terms of traditional theories of capillarity and interfacial physical chemistry at pore level. Then upscaling to macroscopic level of material scale in terms of average volume theorem produces an analytical formula for the water retention characteristic. The methodology produces an explicit form of the water retention curve as a function of three state parameters: the suction, the degree-of-water-saturation and the void-ratio. At last, the model has been tested using experimental measurements.

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Predictive Model for the Water Retention Curve of Deformable Clayey Soils

Cited by 56 publications

References 48 publications

Investigation into water retention behaviour of deformable soils

Investigation into water retention behaviour of deformable soils

Modelling the effect of initial density on soil-water characteristic curves

Modelling of the water retention characteristic of deformable soils

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