CENTRIFUGE MODELLING OF SHALLOW FOUNDATIONS ON FIRM OVER SOFT LAYERED CLAY

Jonathan Black, Alireza Tatari, Manouchehr Hakhamaneshi

In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference

Session: Physical and Numerical Modelling / Modélisation physique et numérique

ABSTRACT: In practice shallow foundations are rarely simply founded on a homogenous soil beds hence there are uncertainties surrounding the mode of failure that will prevail and the bearing capacity factor that should be adopted in design. A series of centrifuge model tests on surface strip footings resting on a layered soil bed having firm clay overlying soft clay of varying thickness are presented. Plane strain test conditions enabled the use of Digital Image Correlation (DIC) to determine the relative displacement of the soil and reveal the foundation failure mechanics. Complementary numerical modelling is also conducted which verifies the model experimental data. General shear and punch failure were observed and the dominant failure mechanism shown to depend on the ratio of the upper layer thickness and footing width.

RÉSUMÉ: Dans la pratique, les fondations sont rarement construites sur des couches de sol homogène. Il y a donc des incertitudes entourant le mode de rupture qui prévaudra et le facteur de capacité portante qui devrait être adopté dans la conception. s conditions des tests relatif du sol et de révéler les mécanismes de rupture de la fondation. En complémentarité, une modélisation numérique est aussi réalisée afin de vérifier les données du modèle expérimental. Les ruptures générales par cisaillement et par sol superficielle et la semelle.

Please include this code when submitting a data update: GEO2015_697

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