Experimental observation of a soft clay consolidation behavior using constant-rate-of-strain (CRS) test

Emad Maleksaeedi, Mourad Karray, Mathieu Nuth

In the proceedings of GeoSt. John's 2019: 72nd Canadian Geotechnical Conference

Session: Soft and sensitive clays

ABSTRACT: This paper reports a laboratory characterisation of a soft clay behaviour with constant-rate-of-strain (CRS) test using a novel oedometer setup developed at Université de Sherbrooke. Different strain rates were applied to observe the evolution of stress-strain relationships, pore water pressure distribution and volume characteristics. The CRS results were then compared to the conventional oedometer test results in order to assess the effect of strain rate variation on pre-consolidation pressure. The results indicated that strain rate affects the determination of the pre-consolidation pressure and the compressibility index of the tested material. In addition, it was observed that the evaluation of CRS test results is limited to the generation of excess pore water pressure within the tested specimens and that a greater care must be taken in the analysis of cases with drainage paths.

RÉSUMÉ: Cet article présente la caractérisation du comportement d'une argile molle à taux de déformation constant (CRS) à l'aide d'un observer l'évolution de la relation contrainte-déformation, la distribution de la pression d'eau interstitielle et les caractéristiques volumiqconventionnels afin d'évaluer l'effet de la variation du taux de déformation sur la pression de pré-consolidation. Les résultats indiquent que le taux de déformation affecte la détermination de la pression de pré-consolidation et l'indice de compressibilité du matériau testé. De plus, on a observé que l'évaluation des résultats d'analyse du CRS se limite à la génération d'une pression d'eau interstitielle en excès dans les échantillons testés et que la présence de tout type de chemin de drainage peut compliquer le processus d'analyse des données.

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Cite this article:
Emad Maleksaeedi; Mourad Karray; Mathieu Nuth (2019) Experimental observation of a soft clay consolidation behavior using constant-rate-of-strain (CRS) test in GEO2019. Ottawa, Ontario: Canadian Geotechnical Society.

@article{Geo2019Paper344,author = Emad Maleksaeedi; Mourad Karray; Mathieu Nuth,title = Experimental observation of a soft clay consolidation behavior using constant-rate-of-strain (CRS) test,year = 2019}