ANALYSES OF ROCK PERMAFROST THAWING BEFORE GROUT INJECTION FOR THE INNAVIK HYDROELECTRIC PROJECT

Jean-Gabriel Dorval, Jean Cote

Dans les comptes rendus d’articles de la conférence: GeoCalgary 2022: 75th Canadian Geotechnical Conference

Session: T9

ABSTRACT: The Innavik hydroelectric project is located in Inukjuak and lies within the continuous permafrost zone. The geotechnical design requires the injection of a grout curtain to prevent water migration in the weathered bedrock that will partially thaw after impoundment. The present study analyzes the time required to complete the rock thawing and to determine the optimal forced thawing solution to be implemented on site prior to grout injection. Permafrost temperatures were monitored by thermistor strings which allowed a comparison between the modelling results and the in-situ data. Further analyses were conducted after the completion of the rock thawing to better represent the site measurements and are also discussed in this study.

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