PIEZOCONE TESTING APPLICATIONS FOR SAFETY ANALYSES OF DAMS ON STRATIFIED DEPOSITS

Valérie Michaud, Marc Smith, Éric Péloquin, Pierre-Alain Konrad

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

Session: In Situ Testing and Instrumentation I / Essais in situ et instrumentation I

ABSTRACT: Piezocone testing is largely used for dam foundation investigations. This sounding technique has shown satisfactory result in stratified deposit. For dam safety analysis, the main challenge remains the understanding of the groundwater conditions within the stratified deposits. The latter is assessed from dissipation test achieved within the sounding. This article presents two cases studies where piezocone testing (including dissipation tests) were performed in order to determine an accurate stratigraphy not only based on soil behavior but also on units having similar total head pressure.

RÉSUMÉ: Le piézocône comme outil d™investigation géotechnique est largement répandu pour les ouvrages de retenue. Cette technique s™est avérée utile pour l™investigation de dépôts fortement stratifiés. Dans ces cas, le défi demeure l™élaboration d™un modèle simplifié et représentatif du dépôt qui tient compte des conditions de l™eau souterraine. L™article présente deux cas où le piézocône (et les essais de dissipation) ont été réalisés afin de produire ces modèles.

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