Wetting, drying and compression characteristics of compacted clay

Sivakumar, V.; Tan, Wei; Murray, Edward J.; McKinley, J. D.

doi:10.1680/geot.2006.56.1.57

Cited by 75 publications

(19 citation statements)

References 11 publications

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“…Note that although the porosity is monomodal upon saturation, the bimodal porosity can be recovered by subsequent drying (Simms and Yanful 2001;Cuisinier and Laloui 2004;Romero et al 2011). Figure 3b gives a typical result of microstructure of compacted kaolin after static compaction to different static pressures published by Sivakumar et al (2006). The macroporosity decreases with increasing load, which implies that the macropores closed up with increasing load.…”

Section: Theoretical Backgroundmentioning

confidence: 97%

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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: Theoretical Backgroundmentioning

confidence: 97%

“…Note that V A includes both solid volume, V s , and intra-aggregate pore volume, V p,m , in aggregates, i.e., (Sivakumar et al 2006). ␦e nw , change in intruded void ration; ␦(logx), change of logarithm of entrance pore diameter.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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

Wang¹,

Wei

2015

Can. Geotech. J.

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“…Significant differences in the soil specific volume are observed during wetting and drying of soils [13][14][15][16][17][18]. Cycles of drying and wetting generate progressive shrinkage in clays and result in a change in fabric during drying, which weakens bonding and, as a consequence, degrades the soil structure [19].…”

Section: Experimental Section: Flooding Simulation Test (Fst)mentioning

confidence: 99%

“…The authors believe that this behavior happened because the wall/sample was not loaded (no vertical load was applied to the top of the sample), since it is show in the literature for non-existent or low vertical stresses that the earth/soil can present expansible behavior when wetted [13,17,18,21]. If a load would be introduced to the top of the wall, the authors believe that the wall/sample could present collapsible behavior (sudden reduction of volume by rearrangement of the particles) [14,15,21]. When the water was drained, the wall/samples presented shrinkage; a volumetric reduction due to drying is a typical behavior of materials containing clay [15,16,21].…”

Section: Sr S = U a -U Wmentioning

confidence: 99%

“…If a load would be introduced to the top of the wall, the authors believe that the wall/sample could present collapsible behavior (sudden reduction of volume by rearrangement of the particles) [14,15,21]. When the water was drained, the wall/samples presented shrinkage; a volumetric reduction due to drying is a typical behavior of materials containing clay [15,16,21]. The wall/sample presented a hydraulic hysteresis [16] due to cycles of wetting/drying (repeated flooding events follow by dry events).…”

Section: Sr S = U a -U Wmentioning

confidence: 99%

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Flooding Effect on Earth Walls

et al. 2010

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Earth building is a sustainable, environmentally friendly and economical method of construction that has been used worldwide for many centuries. For the past three decades, earth has seen a revival as a building material for a modern construction method due to its benefits in terms of low carbon content, low cost and energy involved during construction, as well as the fact that it is a sustainable technology of building. Climate change is influencing precipitation levels and patterns around the world, and as a consequence, flood risk is increasing rapidly. When flooding occurs, earth buildings are exposed to water by submersion, causing an increase in the degree of saturation of the earth structures and therefore a decrease of the suction between particles. This study investigated the effect of cycles of flooding (consecutive events of flooding followed by dry periods) on earth walls. A series of characterization tests were carried out to obtain the physical and mechanical properties of the studied earth material. In a second stage, Flooding Simulation Tests (FST) were performed to explore the earth walls' response to repeated flooding events. The results obtained for the tested earth wall/samples with reinforced material (straw) reveal hydraulic hysteresis when wall/samples are subject to cycles of wetting and drying.

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Effect of Wetting-Drying Cycles on Shear Strength of the Clayey Soils in the Three Gorges Area

Wen

Ji³

2017

Advancing Culture of Living With Landslides

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Wetting, drying and compression characteristics of compacted clay

Cited by 75 publications

References 11 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

Flooding Effect on Earth Walls

Effect of Wetting-Drying Cycles on Shear Strength of the Clayey Soils in the Three Gorges Area

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