Application of a novel oedometer setup for performing constant-rate-of-strain (CRS) test on soft soils

Emad Maleksaeedi, Mathieu Nuth, Mourad Karray, Michael Demers Bonin

In the proceedings of: GeoEdmonton 2018: 71st Canadian Geotechnical Conference; 13th joint with IAH-CNC

Session: Soil Mechanics and Foundations (Advances in Laboratory Testing I)

ABSTRACT: A Modified setup for automatic oedometer apparatus was designed at Université de Sherbrooke to perform constant-rate-of-strain (CRS) tests particularly for soft soils. The proposed setup can simultaneously be used to control the mechanical loading and pore-water pressure along with the measurement of the induced volume changes and interstitial pore-water pressure. The setup can also be employed to perform conventional incremental loading tests automatically. This paper describes the automated CRS oedometer setup in addition to the test procedure. Some preliminary results on soft clay obtained from CRS and conventional oedometer test are presented and compared herein. The results indicate that strain rate change affects the determination of pre-consolidation pressure and the compressibility indexes of soft clays.

RÉSUMÉ: Une cellule modifiée a été conçu au taux de déformation constante (CRS) sur les sols argileux déformables. Le montage proposé offre la possibilité de contrôler simultanément le chargement et la pression interstitiel en mesurant la déformation et la pression interstitielle en excès. Ce montage peut être utilisé pour faire les essais de consolidation par chargement incrémental. Cet du sol argileux sont présentés et comparés avec les résultats des essais de consolidation conventionnelle. Les résultats indiquent que le changement du taux de déformation affecte la pression pré-consolidation et les indices de compressibilité des sols argileux.

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