Case Study: Installation of a Soil-Cement-Bentonite Groundwater Cutoff Wall in Argentia, NL

Nathan Coughenour, Daniel Ruffing

In the proceedings of GeoSt. John's 2019: 72nd Canadian Geotechnical Conference

Session: Posters

ABSTRACT: In 2014, Canada Geo-Solutions Inc. (CGSI) completed a deep groundwater cutoff wall on the Avalon Peninsula of Newfoundland & Labrador using the slurry trenching installation method with a soil-cement-bentonite backfill. The objective of the project was to cutoff groundwater flow from the adjacent bay so that a deep, large excavation, approximately 250 m long x 250 m wide x 19 m below sea level, could be effectively dewatered for use as a graving dock for the construction of an offshore oil rig structure. The cumulative length of cutoff walls installed was 773 linear meters with depths up to 40 m below ground surface and a total area, length x depth, of 29,712 m2. The performance requirements for the installed cutoff wall included a maximum hydraulic conductivity of 5x10-7 cm/s and a minimum shear strength of 100 kPa.

RÉSUMÉ: En 2014, Canada Geo-Solutions Inc. (CGSI) a réalisé un mur d'isolement profond pour eaux souterraines sur la péninsule d'Avalon, à Terre-Neuve-et-Labrador, à l'aide de la méthode d'installation de tranchée en suspension avec un remblai sol-ciment- m de large x 19 m au-dessous du niveau de la mer -forme pétrolière en mer. La longueur cumulée des murs de séparation installés était de 773 mètres linéaires avec des psurface du sol et une superficie totale (longueur x profondeur) de 29 712 m2. Les exigences de performance de la paroi de séparation installée incluaient une conductivité hydraulique maximale de 5x10-7 cm / s et une résistance minimale au cisaillement de 100 kPa.

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Cite this article:
Nathan Coughenour; Daniel Ruffing (2019) Case Study: Installation of a Soil-Cement-Bentonite Groundwater Cutoff Wall in Argentia, NL in GEO2019. Ottawa, Ontario: Canadian Geotechnical Society.

@article{Geo2019Paper191,author = Nathan Coughenour; Daniel Ruffing,title = Case Study: Installation of a Soil-Cement-Bentonite Groundwater Cutoff Wall in Argentia, NL ,year = 2019}