Volumetric strains due to changes in suction or stress of an expansive bentonite/silt mixture treated with lime

Hossein Nowamooz; Farimah Masrouri

doi:10.1016/j.crme.2010.03.011

Volumetric strains due to changes in suction or stress of an expansive bentonite/silt mixture treated with lime
[Déformations volumiques dues aux variations de succion ou de contrainte d'un mélange bentonite–limon traité à la chaux]

Hossein Nowamooz ^1,² ; Farimah Masrouri ¹

¹ Laboratoire Environnement Géomécanique & Ouvrages, Nancy-Université, rue du Doyen Marcel-Roubault, BP 40, 54501 Vandœuvre-lès-Nancy cedex, France
² INSA de Strasbourg, boulevard de la Victoire, 67084 Strasbourg cedex, France

Comptes Rendus. Mécanique, Volume 338 (2010) no. 4, pp. 230-240.

Résumé
Abstract

Afin de mieux connaître le comportement couplé hydrique et mécanique des sols traités, cet article rapporte les études expérimentales effectuées à l'œdomètre avec imposition de succion par la méthode osmotique sur un mélange de bentonite/limon traité à la chaux. Plusieurs cycles de séchage/humidification compris entre 0 et 8 MPa ont été appliqués sur trois éprouvettes. A la fin des cycles de succion, les courbes de compressibilité pour le sol traité à différentes succions imposées (2, 4 et 8 MPa) permettent de déterminer les différents paramètres mécaniques de sol traité : la pression de préconsolidation $P_{0} (s)$ , l'indice de compression vierge $λ (s)$ et l'indice de déchargement élastique κ. La gamme d'imposition de succion ainsi que le nombre de cycles hydriques influencent de manière importante le comportement mécanique des sols traités gonflants.

To further our knowledge of the coupling between the hydraulic cycles and mechanical behavior of treated swelling soils, this Note presents an experimental study on a bentonite/silt mixture treated with lime using a suction controlled osmotic oedometer. Successive wetting and drying cycles were applied at different suction ranges between 0 and 8 MPa, followed by a loading/unloading cycle at different suctions (2, 4 and 8 MPa). The compression curves of the aforementioned suctions provide the necessary information to analyze the influence of hydraulic cycles on the hydromechanical parameters of the treated swelling soils, such as the apparent preconsolidation stress $P_{0} (s)$ , the virgin compression index $λ (s)$ and the unloading elastic index value κ. The suction ranges as well as the number of suction cycles influence the mechanical parameters of the treated swelling soil greatly.

Reçu le : 2009-12-14
Accepté le : 2010-03-29
Publié le : 2010-04-01

DOI : 10.1016/j.crme.2010.03.011

Keywords: Soils, Expansive clay, Treated oil, Swelling, Shrinkage, Cyclic test, Osmotic oedometer
Mots-clés : Sols, Sol gonflant, Sol traité, Gonflement, Retrait, Essai cyclique, Œdomètre osmotique

Affiliations des auteurs :

Hossein Nowamooz ^{1, 2} ; Farimah Masrouri ¹

¹ Laboratoire Environnement Géomécanique & Ouvrages, Nancy-Université, rue du Doyen Marcel-Roubault, BP 40, 54501 Vandœuvre-lès-Nancy cedex, France
² INSA de Strasbourg, boulevard de la Victoire, 67084 Strasbourg cedex, France

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     author = {Hossein Nowamooz and Farimah Masrouri},
     title = {Volumetric strains due to changes in suction or stress of an expansive bentonite/silt mixture treated with lime},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {230--240},
     publisher = {Elsevier},
     volume = {338},
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     year = {2010},
     doi = {10.1016/j.crme.2010.03.011},
     language = {en},
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Hossein Nowamooz; Farimah Masrouri. Volumetric strains due to changes in suction or stress of an expansive bentonite/silt mixture treated with lime. Comptes Rendus. Mécanique, Volume 338 (2010) no. 4, pp. 230-240. doi : 10.1016/j.crme.2010.03.011. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2010.03.011/

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