Shear wave velocity estimation from piezocone test data for Eastern Canada sands

D Perret

In the proceedings of: GeoVancouver 2016: 69th Canadian Geotechnical Conference

Session: GROUND IMPROVEMENT - I

ABSTRACT: Different relations between shear wave velocity and parameters obtained from seismic cone penetration tests are evaluated against a data set collected at 107 sites along the St. Lawrence River Valley in Eastern Canada. Only sands or sand-like soils with a normalized SBT index Ic less than 2.6 and a normalized pore pressure ratio Bq less than 0.1 are considered in this study. All investigated soils are approximately 7,000-12,000 years old and are of a marine, mainly deltaic, origin. Correlations established for Holocene sands systematically under-predict shear wave velocities determined for the tested soils while the opposite is observed for correlation developed for Pleistocene sands. Non-linear regressions and residual analyses conducted for the tested soils indicate that the best prediction model has a functional form incorporating the cone tip resistance, the sleeve friction resistance, and the effective vertical overburden stress. A good correlation is also obtained with only the cone tip resistance and depth. Two new equations are presented specifically for sands in the St. Lawrence River Lowlands which allow for an estimation of shear wave velocity based on piezocone test data.

RÉSUMÉ: Différentes relations entre la vitesse de propagation des ondes de cisaillement et les paramètres obtenus piézocône sismique sont évaluées pour des données collectées à 107 sites répartis le long de la vallée du St-Laurent dans Seuls les sables, caractérisés par un indice SBT normalisé Ic inférieur à 2.6 et un rapport de pression interstitielle Bq inférieur à 0.1, sont retenus. Tous les sables testés ont un âge compris entre 7,000 et 12,000 ans environ, et sonmarine, principalement deltaïque. Les relations établies pour les sables sous-prédisent pléisotocène. Les régressions non-modèle ayant le meilleur pouvoir prédictif a une forme fonctionelle incorporant la résistance en pointe, la friction développée le long du manchon, et la contrainte effective verticale due aux poids des terres. Une bonne corrélation est également obtenue en considérant simplement la résistance en pointe et la profondeur.

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Cite this article:
D Perret (2016) Shear wave velocity estimation from piezocone test data for Eastern Canada sands in GEO2016. Ottawa, Ontario: Canadian Geotechnical Society.

@article{4078_0722135857,author = D Perret,title = Shear wave velocity estimation from piezocone test data for Eastern Canada sands,year = 2016}