Le barrage OA-10B, un exemple de construction d'un barrage sur des dépôts d'origine glaciaire

• Published in: Canadian Journal of Civil Engineering
• Main Authors: Massiéra, Michel, Pelchat, Claude
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1985
• Subjects: General Environmental Science; Civil and Structural Engineering; Eastmain; La Grande River; James Bay
• Online Access: http://dx.doi.org/10.1139/l85-097; http://www.nrcresearchpress.com/doi/pdf/10.1139/l85-097

The OA-10B dam is one of the earth structures of the EOL (Eastmain – Opinaca – La Grande) project within the "La Grande" hydroelectric complex at James Bay, in the northwest of Quebec. Three rivers, the Eastmain, Petit Opinaca, and Opinaca, were diverted to the La Grande River to increase the hydropotential of the LG-2 power plant. Dam OA-10B, 25 m high, has a zoned section with an impervious moraine central core, and rests mainly on overburden foundations consisting of heterogeneous deposits of glacial till. The paper describes the different construction phases of the dam with emphasis on foundation treatments. Key words: construction, core trench, dam, dewatering, excavation, foundation, glacial till, instrumentation, moraine, treatment.