Shrinkage/swelling of compacted clayey loose and dense soils

Hossein Nowamooz; Farimah Masrouri

doi:10.1016/j.crme.2009.10.002

Shrinkage/swelling of compacted clayey loose and dense soils
[Retrait/gonflement des sols gonflants compactés et des sols denses]

Présenté par : Jean-Baptiste Leblond

Hossein Nowamooz ¹ ; Farimah Masrouri ¹

¹ Laboratoire environnement géomécanique & ouvrages, Nancy université, rue du Doyen Marcel-Roubault, BP 40, 54501 Vandœuvre-lès-Nancy cedex, France

Comptes Rendus. Mécanique, Volume 337 (2009) no. 11-12, pp. 781-790.

Résumé
Abstract

Cette Note rapporte les études expérimentales effectuées dans des œdomètres avec imposition de succion par la méthode osmotique sur des sols gonflants compactés denses et lâches. Plusieurs cycles de séchage/humidification compris entre 0 et 8 MPa ont été appliqués sur trois éprouvettes sous trois contraintes mécaniques constantes (15, 30 et 60 kPa). Les éprouvettes lâches/denses manifestent un retrait/gonflement cumulé lors des cycles de séchage/humidification. A la fin des cycles de succion, les déformations volumiques convergent vers un état d'équilibre qui correspond à un état élastique du sol gonflant pour toutes sollicitations hydriques supplémentaires. A cet état élastique, les courbes de compressibilité pour les deux sols étudiés à différentes succions imposées (0, 2 et 8 MPa) convergent vers l'état saturé à partir d'une contrainte élevée. Nous définissons cette pression comme la « contrainte de saturation $(P_{sat})$ ». Les courbes de compression obtenues produisent une base de données suffisante pour examiner le comportement mécanique des sols à l'état d'équilibre élastique.

This Note presents an experimental study performed on expansive compacted loose and dense samples using osmotic oedometers. Several successive wetting and drying cycles were applied in a suction range between 0 and 8 MPa under different values of constant net vertical stress (15, 30, and 60 kPa). During the suction cycles, the dense samples showed cumulative swelling strains, while the loose samples showed volumetric shrinkage accumulation. At the end of the suction cycles, the volumetric strains converged to an equilibrium stage that indicated elastic behavior of the swelling soil for any further hydraulic variations. At this stage, the compression curves for the studied soil at the different imposed suctions (0, 2, and 8 MPa) converged towards the saturated state curve for the high applied vertical stresses. We defined this pressure as the saturation stress $(P_{sat})$ . The compression curves provided sufficient data to examine the soil mechanical behavior at the equilibrium stage.

Reçu le : 2009-05-26
Accepté le : 2009-09-03
Publié le : 2009-10-17

DOI : 10.1016/j.crme.2009.10.002

Keywords: Continuum mechanics, Expansive soil, Experimentation, Modeling, Suction cycles
Mots-clés : Milieux continus, Sol gonflant, Expérimentation, Modélisation, Cycles de succion

Affiliations des auteurs :

Hossein Nowamooz ¹ ; Farimah Masrouri ¹

¹ Laboratoire environnement géomécanique & ouvrages, Nancy université, rue du Doyen Marcel-Roubault, BP 40, 54501 Vandœuvre-lès-Nancy cedex, France

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     title = {Shrinkage/swelling of compacted clayey loose and dense soils},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {781--790},
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     volume = {337},
     number = {11-12},
     year = {2009},
     doi = {10.1016/j.crme.2009.10.002},
     language = {en},
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Hossein Nowamooz; Farimah Masrouri. Shrinkage/swelling of compacted clayey loose and dense soils. Comptes Rendus. Mécanique, Volume 337 (2009) no. 11-12, pp. 781-790. doi : 10.1016/j.crme.2009.10.002. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2009.10.002/

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