[Retrait/gonflement des sols gonflants compactés et des sols denses]
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 ». 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 . The compression curves provided sufficient data to examine the soil mechanical behavior at the equilibrium stage.
Accepté le :
Publié le :
Mot clés : Milieux continus, Sol gonflant, Expérimentation, Modélisation, Cycles de succion
@article{CRMECA_2009__337_11-12_781_0,
author = {Hossein Nowamooz and Farimah Masrouri},
title = {Shrinkage/swelling of compacted clayey loose and dense soils},
journal = {Comptes Rendus. M\'ecanique},
pages = {781--790},
publisher = {Elsevier},
volume = {337},
number = {11-12},
year = {2009},
doi = {10.1016/j.crme.2009.10.002},
language = {en},
}
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/
[1] Cyclic swelling behavior of clays, Journal of Geotechnical Engineering, Volume 121 (1995), pp. 562-565
[2] Expansive bentonite/sand mixtures in cyclic controlled suction drying and wetting, Engineering Geology, Volume 81 (2005), pp. 213-226
[3] T.Y. Chu, C.H. Mou, Volume change characteristics of expansive soils determined by controlled suction tests, in: Proc. 3rd Int. Conf. Expansive Soils, Haïfa, vol. 2, 1973, pp. 177–185
[4] Expansive soils under cyclic drying and wetting, Geotechnical Testing Journal, Volume 14 (1991), pp. 96-102
[5] E. Pousada, Deformabilidad de arcillas expansivas bajo succión controlada, Doctoral Thesis, Universidad Politecnica de Madrid, Spain, 1984
[6] Coupling of hydraulic hysteresis and stress–strain behaviour in unsaturated soils, Géotechnique, Volume 53 (2003) no. 1, pp. 41-54
[7] ASTM D 5298-94, Standard test method for measurement of soil potential (suction) using filter paper, 4.09, 1995, pp. 154–159
[8] Water permeability, water retention and microstructure of unsaturated Boom clay, Engineering Geology, Volume 54 (1999), pp. 117-127
[9] ASTM D 4546-90, One-dimensional swell or settlement potential of cohesive soils, 4.08, 1995, pp. 693–699
[10] Density-dependent hydromechanical behaviour of a compacted expansive soil: Experimental and analytical aspects, Engineering Geology, Volume 106 (2009) no. 3–4, pp. 105-115
[11] Hydromechanical behavior of a compacted swelling soil over a wide suction range, Engineering Geology, Volume 81 (2005), pp. 204-212
[12] The relationship between suction and the swelling properties in a heavily compacted swelling clay, Engineering Geology, Volume 50 (1998), pp. 31-48
[13] Modelling the mechanical behaviour of expansive clays, Engineering Geology, Volume 54 (1999), pp. 173-183
[14] On the generalized stress–strain behaviour of the wet clay (J. Heyman; F.A. Leckie, eds.), Engineering Plasticity, Cambridge University Press, Cambridge, 1968, pp. 535-609
[15] H. Nowamooz, Retrait/gonflement des sols argileux naturels et compactés, Doctoral Thesis, Institut National Polytechnique de Lorraine, Nancy, France, 2007, 199 pp
[16] Hydromechanical behaviour of an expansive bentonite/silt mixture in cyclic suction-controlled drying and wetting tests, Engineering Geology, Volume 101 (2008) no. 3–4, pp. 154-164
[17] A model for the volume change behavior of heavily compacted swelling clays, Engineering Geology, Volume 64 (2002), pp. 233-250
[18] A density-dependent elastoplastic hydro-mechanical model for unsaturated compacted soils, International Journal for Numerical and Analytical Methods in Geomechanics, Volume 31 (2007) no. 11, pp. 1257-1279
Cité par Sources :
Commentaires - Politique
Hossein Nowamooz; Farimah Masrouri
C. R. Méca (2010)
Comportement hydromécanique d'un sol gonflant compacté sous très fortes succions
Olivier Cuisinier; Farimah Masrouri
C. R. Méca (2003)
Influence of suction cycles on the soil fabric of compacted swelling soil
Hossein Nowamooz; Farimah Masrouri
C. R. Géos (2010)