[Influence de l'indice des vides inter-granulaire sur la réponse monotone et cyclique non draine des sols sableux]
La liquéfaction des dépôts de sols sableux pendant les séismes a toujours été l'un des problèmes les plus importants dans le domaine de la géotechnique. Un défi important est l'évaluation de la resistance au cisaillement non drainée appropriée des sols liquéfiables à utiliser dans l'étude de la stabilité de liquéfaction de différents types d'ouvrages en terre (remblais, barrages en terre, etc.). L'objectif de ce travail expérimental est d'étudier l'effet de l'indice des vides intergranulaire sur la résistance au cisaillement non drainée mesurée en changement de phase des mélanges de sable–limon lâche, moyennement dense et dense (, 50, et ) sous chargement monotone et le potentiel de liquéfaction sous chargement cyclique. Pour cela, nous considérons que la matrice de sable contenant les fines est la combinaison de deux matrices : une matrice de sol grenu et une matrice de sol fin. A cet effet, une série d'essais de compression triaxiale non drainés a été effectuée sur des échantillons de sable limoneux saturés à des teneurs en fines variant de 0 à . Les résultats montrent que l'indice des vides global ne reflète pas le comportement réel du sol et que la résistance au cisaillement non drainée mesurée en changement de phase peut être corrélée avec l'indice des vides intergranulaire des mélanges de sable–limon jusqu'à une teneur en fines de . En effet, elle diminue linéairement avec l'augmentation de l'indice des vides inter-granulaire. Les résultats des essais cycliques non drainés confirment cette tendance.
Liquefaction of sandy soil deposits during earthquakes has been one of the most important problems in the field of geotechnical earthquake engineering. A major challenge is the assessment of the appropriate undrained shear strength of liquefied soils to be used in the study of liquefaction stability of different types of earth structures (embankments, earthdams, etc.). The objective of this laboratory investigation is to study the effect of the inter-granular void ratio on the phase transition state undrained shear strength of loose, medium dense and dense (, 50, and 90%) sand–silt soil mixtures under monotonic loading and liquefaction potential under cyclic loading. For this purpose, we considered the matrix of sand with fines as a combination of two sub-matrices: a coarser grain matrix and a finer grain matrix. Moreover, series of undrained triaxial compression tests were carried out on reconstituted saturated silty sand samples with fines contents ranging from 0 to 50%. The results show that the global void ratio does not reflect the real behaviour of the soil and the undrained shear strength at the phase transition state can be correlated to the inter-granular void ratio of the sand–silt mixtures up to 50% fines content. Indeed, it decreases linearly with further increase in the inter-granular void ratio. The results of the undrained cyclic tests confirm this tendency.
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Mot clés : Sols, Sable limoneux, Résistance au cisaillement résiduelle, Indice des vides inter-granulaire, Fines, Liquéfaction
M. Belkhatir 1 ; A. Arab 1 ; N. Della 1 ; H. Missoum 2 ; T. Schanz 3
@article{CRMECA_2010__338_5_290_0,
author = {M. Belkhatir and A. Arab and N. Della and H. Missoum and T. Schanz},
title = {Influence of inter-granular void ratio on monotonic and cyclic undrained shear response of sandy soils},
journal = {Comptes Rendus. M\'ecanique},
pages = {290--303},
publisher = {Elsevier},
volume = {338},
number = {5},
year = {2010},
doi = {10.1016/j.crme.2010.04.002},
language = {en},
}
TY - JOUR AU - M. Belkhatir AU - A. Arab AU - N. Della AU - H. Missoum AU - T. Schanz TI - Influence of inter-granular void ratio on monotonic and cyclic undrained shear response of sandy soils JO - Comptes Rendus. Mécanique PY - 2010 SP - 290 EP - 303 VL - 338 IS - 5 PB - Elsevier DO - 10.1016/j.crme.2010.04.002 LA - en ID - CRMECA_2010__338_5_290_0 ER -
%0 Journal Article %A M. Belkhatir %A A. Arab %A N. Della %A H. Missoum %A T. Schanz %T Influence of inter-granular void ratio on monotonic and cyclic undrained shear response of sandy soils %J Comptes Rendus. Mécanique %D 2010 %P 290-303 %V 338 %N 5 %I Elsevier %R 10.1016/j.crme.2010.04.002 %G en %F CRMECA_2010__338_5_290_0
M. Belkhatir; A. Arab; N. Della; H. Missoum; T. Schanz. Influence of inter-granular void ratio on monotonic and cyclic undrained shear response of sandy soils. Comptes Rendus. Mécanique, Volume 338 (2010) no. 5, pp. 290-303. doi : 10.1016/j.crme.2010.04.002. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2010.04.002/
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