Assessment of the effect of loading frequency on cyclic behaviour of sensitive clay

Mustapha Abdellaziz, Mourad Karray, Mahmoud N. Hussien, Mohamed Chekired

In the proceedings of: GeoOttawa 2017: 70th Canadian Geotechnical Conference; 12th joint with IAH-CNC

Session: Seismiscity and Sensitive Clay

ABSTRACT: Although the loading frequency may have an effect on the cyclic behaviour of clayey soil, current dynamic models generally neglect this effect especially in determining the pore pressure generation. This paper presents the results of a series of cyclic undrained test carried out to study the influence of the frequency on the cyclic behaviour of sensitive clay from Eastern Canada. A geotechnical characterization programs has been carried out in the field first and then in the laboratory on undisturbed clay samples. The cyclic tests were performed in specialized apparatuses, namely the TxSS and the conventional triaxial apparatuses. The TxSS tests were performed on structured and destructured clays in order to simulate various stress conditions. The experimental results show the significant effect of the loading frequency on the undrained strength of the sensitive clay and on the pore water pressure generation during and after the tests.

RÉSUMÉ: Bien que la fréquence de chargement puisse avoir un effet sur le comportement cyclique des sols argileux, les modèles dynamiques actuels négligent généralement cet effet en particulier dans la détermination de la génération de pression interstitielles. Cet article présente les résultats de tests cycliques non drainés effectués pour étudier l'influence de la fréquence sur le comportement cyclique de l'argile sensible de l'est du Canada. Une campagne de caractérisation géotechnique a été effectuée sur le terrain d'abord, puis en laboratoire sur des échantillons d'argile non remaniés. Les tests TxSS ont été effectués sur des argiles structurées et déstructurées afin de simuler diverses conditions de contraintes. Les résultats expérimentaux montrent un effet significatif du changement de la fréquence de chargement sur la résistance non drainée de l'argile et sur la génération de pression interstitielles pendant et après les essais.

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Cite this article:
Mustapha Abdellaziz; Mourad Karray; Mahmoud N. Hussien; Mohamed Chekired (2017) Assessment of the effect of loading frequency on cyclic behaviour of sensitive clay in GEO2017. Ottawa, Ontario: Canadian Geotechnical Society.

@article{geo2017Paper774,author = Mustapha Abdellaziz; Mourad Karray; Mahmoud N. Hussien; Mohamed Chekired,title = Assessment of the effect of loading frequency on cyclic behaviour of sensitive clay,year = 2017}