Wetting-induced volume changes in compacted silty clays and high-plasticity clays

Ferber, Valéry; Auriol, Jean-Claude; Cui, Yu-Jun; Magnan, Jean-Pierre

doi:10.1139/t07-081

Cited by 29 publications

(13 citation statements)

References 30 publications

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“…5, indicate that these two terms are proportional. Similar results have been obtained by Ferber et al (2008) for the case of free swelling tests performed on a clay and a silty clay. For a suction equal to zero, the proportionality coefficient is obviously equal to 1 (initial state of each test).…”

Section: Projection In the Plane W = Constantsupporting

confidence: 86%

Definition and experimental determination of a soil-water retention surface

2010

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Definition and experimental determination of a soil-water retention surface S. Salager, M.S. El Youssoufi, and C. SaixAbstract: This paper deals with the definition and determination methods of the soil-water retention surface (SWRS), which is the tool used to present the hydromechanical behaviour of soils to highlight both the effect of suction on the change in water and total volumes and the effect of deformation with respect to the water retention capability. An experimental method is introduced to determine the SWRS and applied to a clayey silty sand. The determination of this surface is based on the measurement of void ratio, suction, and water content along the main drying paths. These paths are established for five different initial states. The experimental results allow us to define the parametric equations of the main drying paths, expressing both water content and void ratio as functions of suction and initial void ratio. A model of the SWRS for clayey silty sand is established in the space (void ratio -suction -water content). This surface covers all possible states of the soil inside the investigated range for the three variables. Finally, the SWRS is used to study the relations between water content and suction at a constant void ratio and between void ratio and suction at a constant water content.Key words: water retention, hydromechanical coupling, retention behaviour.Résumé : Cet article traite de la définition et des méthodes de détermination de la surface de rétention sol-eau (« SWRS ») comme outil de représentation du comportement hydromécanique de sols permettant de mettre en évidence à la fois l'effet de la succion sur les changements de volumes (volume d'eau et volume total) et l'effet de la déformation sur la capacité de rétention d'eau des sols. Une méthode expérimentale de détermination de la SWRS du sol est présentée en détails puis appliquée pour un sable limoneux argileux. La prise en compte de la déformation conduit à une représentation surfacique à partir de la mesure de triplets (indice des vides -succion -teneur en eau) le long des chemins de séchage principaux. Ces chemins sont établis pour cinq états initiaux différents. Les résultats expérimentaux permettent d'établir les équations paramétriques des chemins de séchage principaux exprimant l'indice des vides et la teneur en eau en fonction de la succion et de l'indice des vides initial. Un modèle de surface caractéristique sol-eau est élaboré pour le sable limoneux argileux dans l'espace (indice des vides -succion -teneur en eau). Cette surface couvre tous les états possibles du sol dan les gammes étudiées des trois variables. La SWRS est finalement utilisée pour Õ tudier les relations entre la teneur en eau et la succion pour un indice des vides constant, et entre l'indice des vides et la succion pour une teneur en eau constante.

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Section: Projection In the Plane W = Constantsupporting

confidence: 86%

Definition and experimental determination of a soil-water retention surface

2010

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“…Then, the moist soil and lime were thoroughly mixed and were dynamically compacted 1 h after mixing. The compaction was performed directly in cylinder moulds of 100 mm height and 50 mm diameter using a mini Proctor compaction device similar to that used by Ferber et al (2008). The compaction was carried out in 10 layers so as to ensure a homogenous compaction within the specimens.…”

Section: Specimen Preparationmentioning

confidence: 99%

Impact of initial state on the fabric and permeability of a lime-treated silt under long-term leaching

et al. 2009

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The long-term performance of lime-treated soil is still in question, especially in the case of the use of such soils to build earthen structures in permanent contact with water (i.e., dams, river levees, etc.) Indeed, water circulation may induce significant alteration of the improvements brought by the lime treatment. In this context, the main objective of this work is to study the long-term behaviour (durability) of lime-treated soils submitted to water circulation as well as to determine the most favourable initial soil compaction in terms of lime-treated soil durability. First, the impact of lime addition on soil microstructure is investigated with mercury intrusion porosimetry tests. This was done to highlight the effect of curing time, lime dosage, and compaction on soil initial permeability, a critical parameter in terms of long-term behaviour of the lime-treated soil. Then, lime-treated soil samples were submitted to an accelerated circulation of water over a period of 150 days. The obtained results show that soil permeability did not fluctuate with circulation time. This has been confirmed by the results obtained on the samples' microstructure that remained stable throughout the experiments.Résumé : La performance à long terme des sols traités à la chaux est une question encore largement débattue, notamment dans le contexte de l'utilisation de ces sols pour la réalisation d'ouvrages en terre en contact permanent ou fréquent avec l'eau (digue, barrage, etc.). L'eau pourrait en effet induire une altération des améliorations apportées par le traitement à la chaux. Ce travail vise à apporter quelques éléments de réponse sur la durabilité des performances d'un sol traité à la chaux lorsqu'il est soumis à un écoulement d'eau avec un volet concernant l'identification des conditions de compactage du sol les plus favorables en terme de durabilité. Cette étude se consacre dans un premier temps à l'étude de l'ajout de chaux sur la microstructure du sol par l'utilisation de la porosimétrie au mercure. Cette étape était un préalable à une meilleure compréhension de l'impact du dosage, du temps de cure et des conditions de compactage sur la perméabilité du sol traité à la chaux. Dans un deuxième temps, le sol traité a été soumis à une circulation accélérée d'eau sur une période de 150 jours. Les résultats montrent que, dans le cas du limon étudié, la perméabilité du matériau n'évolue pas en cours de circulation, ce qui est à relier par la relative stabilité de la microstructure dans le cas du limon étudié.Mots-clés : limon traité à la chaux, perméabilité, texture, état initial, lixiviation.

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“…Since clay consists of very small particles it is neither a granular material nor is the number of clay particles in a range which could be handled by current simulation hardware in a reasonable time. Microscopic observations show that the clay particles clump together in aggregates of various scales like a fractal structure [13]. The swelling and shrinking of clay can be explained as a behaviour of the aggregates [14].…”

Section: Numerical Simulationmentioning

confidence: 99%

The influence of saturation on the cracking process in compacted desiccating clays

2016

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Abstract. Tensile failure in unsaturated cohesive soils during desiccation is important for the design of geotechnical applications such as capping systems of landfills and sealing material of dikes. This study presents the results of different initial parameters of compacted clay samples such as gravimetric water content, dry density and degree of saturation. These parameters are varied systematically for each test to find the correlation between those parameters and the tensile failure. The tensile failure for all tests occurred by a comparable constant change of the degree of saturation. The soil specific saturation ratio Sr,s is defined as the quotient of saturation changes ΔSr to initial saturation Sr,0. This parameter related to the total suction shows an equal course for all results. All in all, the course of the soil specific saturation ratio Sr,s is independent of all initial parameters. These results provide a physical and hydraulicmechanical description for modelling the desiccation process. To demonstrate the initiation and progress of tensile failure, the experimental results are modelled with a Discrete Element Method (DEM) approach.

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Wetting-induced volume changes in compacted silty clays and high-plasticity clays

Cited by 29 publications

References 30 publications

Definition and experimental determination of a soil-water retention surface

Definition and experimental determination of a soil-water retention surface

Impact of initial state on the fabric and permeability of a lime-treated silt under long-term leaching

The influence of saturation on the cracking process in compacted desiccating clays

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