Suction Induced Effects on the Fabric of a Structured Soil

Koliji, Azad; Laloui, Lyesse; Cusinier, Olivier; Vulliet, L.

doi:10.1007/s11242-005-3656-3

Cited by 75 publications

(40 citation statements)

References 23 publications

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“…the smaller pores, referred to as intraaggregate pores), as opposed to 'macrostructure' ('the arrangement of the soil aggregates and the relation between the structural units at the aggregate level' [1,22] (i.e. the larger pores referred to as interaggregate pores) or (b) the features of the soil at the particle/aggregate scale.…”

Section: Discussionmentioning

confidence: 99%

“…As a result of this research, recent models describing the water retention of compacted soils (e.g. [13,36]) explicitly accounted for the evolving structure/fabric of the aggregated soil, distinguishing between two levels of structure of aggregated soils: intra-aggregate (micropores) and inter-aggregate (macropores) [1,22]. Despite the extensive research on the SWRC, relatively little is known on the soil water retention behaviour of artificially cemented materials (e.g.…”

Section: Introductionmentioning

confidence: 99%

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A study of the water retention curve of lime-treated London Clay

2016

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This paper investigates the drying and wetting soil water retention curves (SWRCs) of statically compacted lime-stabilised London Clay specimens. A series of tests were performed using the contact filter paper method, pressure plate apparatus and a suction-controlled triaxial system incorporating the axis translation technique. These investigated the water retention of the soil under different boundary and stress-state conditions and simultaneously determined the volume change in the soil during drying and wetting. Factors relevant to the lime treatment of soils, such as curing period and method (air vs. water curing), were also considered. Finally, the hysteresis of the SWRC of the chemically treated soil (for which there appears to be a lack of information in the international literature) was investigated. The results showed that the treatment with lime increased the volumetric stability but reduced the water retention ability due to a more open structure enabled by the flocculation and chemical bonding effects. Curing period and method effect appears to be small. Hysteresis was noted to some degree in all instances.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A study of the water retention curve of lime-treated London Clay

2016

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“…The first zone corresponds to the interaggregate porosity and the second zone corresponds to the intraaggregate porosity (Romero and Vaunat 2000;Koliji et al 2006). Only low suctions can develop in the interaggregate porosity and the effects of hydromechanical couplings are important in this zone.…”

Section: Behavioural Features Of Water Retentionmentioning

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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“…The PSD is an essential fabric element that has been used in geotechnical engineering applications and correlated with macroscopic properties, such as its dependency on the type of compaction for clays (Ahmed et al 1974;Kong et al 2005); the differences between laboratory and field-compacted soils for equivalent dry density and moulding water content (Prapaharan et al 1991;Jommi and Sciotti 2003); the saturated water permeability (GarciaBengochea et al 1979;Juang and Holtz 1986a, b;Lapierre et al 1990); frost-heave properties (Reed et al 1979); and qualitatively with macroscopic volume changes-consolidation- (Delage and Lefebvre 1984;Griffiths and Joshi 1989;Coulon and Bruand 1989;Tessier et al 1992;Qi et al 1996). Regarding unsaturated soils, MIP results have been used to predict the water retention properties (Prapaharan et al 1985;Romero et al 1999;Aung et al 2001;Simms andYanful 2002, 2005); as well as macroscopic volume changes due to the effects of mechanical and hydraulic paths (Al-Mukhtar 1995;Al-Mukhtar et al 1996;Qi et al 1996, Cui et al 2002Simms and Yanful 2004;Cuisinier and Laloui 2004;Lloret et al 2004;Romero et al 2005;Koliji et al 2006b;Hoffmann et al 2007). Observed correlations between the water retention, volume change, and water permeability in unsaturated soils with the PSD as measured by MIP are presented in this report.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Investigation in Unsaturated Soils: A Review with Special Attention to Contribution of Mercury Intrusion Porosimetry and Environmental Scanning Electron Microscopy

2008

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With the advent of modern microstructural testing techniques and microstructure based constitutive models the microstructural characterisation of soils is gaining prominence. This paper reviews the history of microstructure investigation in unsaturated soils and discusses the engineering significance of this research to date. After a brief overview of the main microstructural techniques, the paper focuses on the evaluation of the current state of use and the development of two widely used techniques to study the microstructure of partially saturated soils, namely mercury intrusion porosimetry and the environmental scanning electron microscopy. The details of these techniques, their advantages and limitations, are first covered, followed by the presentation of selected test results. These results highlight the use of these techniques for understanding different hydro-mechanical behavioural features observed at macroscopic scale. Specifically, the paper shows the use of these techniques to explore the fundamental properties of water retention characteristics, water permeability, and micro and macrostructural interactions along different hydro-mechanical paths.

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Suction Induced Effects on the Fabric of a Structured Soil

Cited by 75 publications

References 23 publications

A study of the water retention curve of lime-treated London Clay

A study of the water retention curve of lime-treated London Clay

Investigation into water retention behaviour of deformable soils

Microstructure Investigation in Unsaturated Soils: A Review with Special Attention to Contribution of Mercury Intrusion Porosimetry and Environmental Scanning Electron Microscopy

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