Volume change behaviour of a compacted scaly clay during cyclic suction changes

Farulla, Camillo Airò; Ferrari, Alessio; Romero, E.

doi:10.1139/t09-138

Cited by 62 publications

(30 citation statements)

References 17 publications

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“…The majority of the accumulated volumetric strain occurs during the first wetting-drying cycle. As summarized earlier in the text, similar phenomena have been confirmed by many other experimental studies performed by Dif and Bluemel (1991), Day (1994), Al-Homoud et al (1995), Basma et al (1996), Alonso et al (2005), Nowamooz and Masrouri (2008), and Airò Farulla et al (2010).…”

Section: Two Swelling-shrinkage Strain Componentssupporting

confidence: 86%

“…The postulation that the aggregate deformation is reversible can be confirmed directly by digital image analysis of environmental scanning electronic microscope (ESEM) micrographs, in which the volume change of aggregates can be extracted. Romero and Simms (2008) and Airò Farulla et al (2010) have reported that the aggregate deformation shows good reversibility by this method. Besides the elastic-like behavior of aggregates under loading, the aggregates with unstable structure may break down.…”

Section: Theoretical Backgroundmentioning

confidence: 85%

“…To reduce the test duration, suction was changed in a single step between the lower and higher values of each half cycle in both studies. Airò Farulla et al (2010) have shown that the size of applied suction increments has little influence on eventual volumetric strain. As can be seen clearly from Fig.…”

Section: Two Swelling-shrinkage Strain Componentsmentioning

confidence: 99%

“…These tests can be grouped into two categories: alternately soaked and dried tests (Dif and Bluemel 1991;Day 1994;Basma et al 1996;Fleureau et al 2002;Tripathy et al 2002;Tripathy and Subba Rao 2009;Lin and Cerato 2013), and cyclic suction-controlled tests (Alonso et al 2005;Nowamooz and Masrouri 2008;Nowamooz et al 2009;Airò Farulla et al 2010). In alternately soaked and dried tests, only water contents of soil specimens are measured directly, therefore the wetting-drying path is usually quantified in terms of volumetric strain versus water content; while in cyclic suction-controlled tests, soil specimens are allowed to swell or shrink in equilibrium with a predetermined applied suction, therefore the wetting-drying path is usually characterized by the relationship between volumetric strain and suction.…”

Section: Introductionmentioning

confidence: 99%

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Modeling swelling–shrinkage behavior of compacted expansive soils during wetting–drying cycles

Wang¹,

Wei

2015

Can. Geotech. J.

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This paper presents a straightforward approach for modelling volume change behavior of expansive soils during wetting-drying cycles. The swelling-shrinkage strain of expansive soils induced by cyclic wetting and drying was decomposed with distinctive physical background into a reversible component, which shows a synchronous change with the cyclic change of suction, and an irreversible component, which is generated mainly in the early stage of the wetting-drying process. The mechanisms of the two swelling-shrinkage strain components can be well explained through the double-level structure of expansive soils and its evolution with mechanical and hydraulic loading. The reversible component originates from the reversible deformation behavior of aggregates, and primarily depends on current suction or water content. The irreversible component is associated with the irreversible change of macrostructure, reflecting the difference in soil structures at current state and the equilibrium state. A practical constitutive model was proposed for compacted expansive clays from a global and phenomenological perspective. The model parameters can be calibrated with observed macroscopic deformation behavior without measuring microstructural parameters. The performance of the presented model was validated by simulating cyclic suctioncontrolled tests as well as an alternately soaked and dried test with irregular amplitudes of suctions.Key words: expansive soils, volumetric behavior, swelling, shrinkage, model. Résumé :Cet article présente une approche directe pour modéliser les variations de volume de sols expansifs durant des cycles de mouillage-séchage. La déformation causée par le gonflement-retrait des sols expansifs induite par les cycles de mouillageséchage a été décomposée, selon des notions physiques, en une composante réversible qui démontre une variation synchrone avec les variations cycliques de succion, et une composante irréversible qui est générée principalement dans les premières étapes du processus de mouillage-séchage. Les mécanismes des deux composantes de la déformation en gonflement-retrait peuvent être bien expliqués grâce à la structure à deux niveaux des sols expansifs et par l'évolution de cette structure avec les charges mécaniques et hydrauliques. La composante réversible provient de la déformation réversible des agrégats, et dépend principalement de la succion présente et de la teneur en eau. La composante irréversible est associée avec les variations irréversibles de la macrostructure, reflétant les différences dans les structures du sol à l'état présent et à l'état d'équilibre. Un modèle constitutif pratique est proposé pour les argiles expansives compactées basé sur une perspective globale et phénomé-nologique. Les paramètres du modèle peuvent être calibrés avec les déformations macroscopiques observées sans mesurer les paramètres microstructuraux. La performance du modèle présenté a été validée en simulant des essais de succion cyclique contrôlés de même d'avec un essai alternant le mouillage...

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Section: Two Swelling-shrinkage Strain Componentssupporting

confidence: 86%

Section: Theoretical Backgroundmentioning

confidence: 85%

Section: Two Swelling-shrinkage Strain Componentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Modeling swelling–shrinkage behavior of compacted expansive soils during wetting–drying cycles

Wang¹,

Wei

2015

Can. Geotech. J.

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“…The specimens were obtained by dynamically compacting clay lumps that were partially disaggregated (passing them through a 4.25 mm sieve), previously air-dried, and subsequently prepared to target water content values (Ferrari 2007). The compaction took place on the dry side of optimum, providing specimens that are characterized by a double-structured microfabric arrangement (Airò Farulla et al 2010). The effect of suction variations on the volumetric behaviour at the microstructural level was examined using environmental scanning electron microscopy (ESEM) photomicrographs (Airò Farulla et al 2010).…”

Section: Experimental Results On a Clayey Soilmentioning

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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High salinity prolongs water processes required for soil structure stability during drying–wetting cycles

Chang,

Feng,

Xing

et al. 2024

Soil Science Soc of Amer J

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Climate events, such as drought and rainfall, can lead to a cycle of drying and wetting that may cause changes in soil structure, leading to deteriorations in the health of saline soils. However, little is known about the extent and behavior of soil structure degradation under the combined influences of salinity and drying–wetting (D‐W) cycles. Thus, we systematically investigated the effects of salinity (0, 5, 30, and 100 g/L, labeled as CK, T5, T30, and T100) and D‐W cycles on soil structure by determining soil volume, shrinkage, and swelling potentials along with soil pore character obtained from soil shrinkage characteristics curve, intending to explore how D‐W cycles and salinity affect soil structure. The results showed that soil deformation behaviors in saline and non‐saline soils varied with the number of D‐W cycles. Irreversible deformation of the soil was observed during continual D‐W cycles. The soil volume increased by 3.75%–15.73% after three D‐W cycles. In vertical direction, the maximum expansion magnitude for each treatment was reached with the value of 29.03%, 23.42%, 34.23%, and 35.87% in CK, T5, T30, and T100, respectively. The magnitudes of shrinkage and expansion were equal in the horizontal direction since the soil samples consistently returned to their original dimensions. Furthermore, the decrease was observed in the micropores and capillary pores affected by salinity, with values of 50%, 58.6%, and 70.4% in CK, T5, T30, and T100, respectively. However, the D‐W cycles primarily affected large pores. High salinity levels enhanced swelling potential and inhabit shrinkage potential, prolonging the water processes required for the soil structure to achieve stability. The results of this study underscore the necessity of understanding the hysteresis of soil volume change and elucidate the mechanisms of soil structure deterioration driven by salinity and D‐W cycles. These findings provide a valuable reference for healthier soil management.

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Volume change behaviour of a compacted scaly clay during cyclic suction changes

Cited by 62 publications

References 17 publications

Modeling swelling–shrinkage behavior of compacted expansive soils during wetting–drying cycles

Modeling swelling–shrinkage behavior of compacted expansive soils during wetting–drying cycles

Investigation into water retention behaviour of deformable soils

High salinity prolongs water processes required for soil structure stability during drying–wetting cycles

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