ASSESSMENT OF SOIL LIQUEFACTION POTENTIAL OF AN EMBAMKMENT DAM IN THE CHARLEVOIX SEISMIC ZONE – CASE STUDY WITH THE COMPARAISON OF THREE TOTAL STRESS METHODS

Olivier Hurley, Pierre Boulanger, Juliana Ruiz Suescun

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

Session: Earthquakes and Geohazards I / Séismes et géoaléas I

ABSTRACT: This paper aims to compare three total stress methods to evaluate soil liquefaction triggering of an embankment dam located in the CSZ, a highly seismic region of Quebec in eastern Canada. The three approaches are: 1- a preliminary semi-empirical method based on Idriss & Boulanger (2008), 2- a 1D nonlinear Finite Difference Method site response with FLAC and 3- a 2D equivalent linear Finite Element Method analysis with QUAKE/W. All methods estimate or calculate the cyclic shear stress ratio (CSR) and the cyclic resistance ratio (CRR) is estimated from in situ testing. For the fill in place, all three analysis show potential for liquefaction triggering since the CSR is always higher than the CRR. The simplified solution shows good results with the 2D analysis with QUAKE/W while the 1D analysis underestimates the CSR profile. The effect of the 2D geometry is verified by fitting the response spectra between the 2D and 1D dynamic analysis with a factor of 2.

RÉSUMÉ: en terre situé dans la zone sismique de Charlevoix, une région dont le potentiel sismique est très important. Les trois méthodes employées sont: 1- la méthode simplifiée ), 2- une modélisation numérique 1D non-linéaire avec FLAC et 3- une analyse numérique 2D en équivalence linéaire avec QUAKE/W de la suite Geo-Studio. Toutes ces méthodes estiment ou calcul la sollicitation cyclique (CSR) et la résistance cyclique (CRR) est estimé par un essai in situ. Le remblai présente un potentiel de liquéfaction puisque le CSR est toujours plus élevé que le CRR. La méthode simplifiée et la modélisation numérique 2D présente un profil CSR similaires tandis que la modélisation en 1D sous-

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