Highway 27:10 – Replacement of Red Deer River Bridge East of Morrin, Alberta: Abutment Stability Pile Wall

Stephen Coulter, Donald Proudfoot, Malika Ali, Yingyi Li

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

Session: Transportation Geotechnics

ABSTRACT: Highway 27:10 crosses the Red Deer River west of the town of Morrin, Alberta, via a bridge built in 1959, which required replacement by its owner, Alberta Transportation. Site investigations indicated that the crossing was underlain by a steeply dipping bedrock surface and that the future eastern abutment area featured a 2.5 m thick and weak bentonite layer at a depth of approximately 15 m, overlain by native compressible clays. Stabilization was undertaken using a cast-in-place concrete pile wall located at the toe of the maximum 12 m high abutment fill. Instrumentation of the pile wall and abutment area allowed for the monitoring of slope and pile movements as well as the dissipation of pore pressures prior to commencing the installation of driven steel abutment piles. This work included several design, construction, and quality assurance challenges in a saturated riverbed environment.

RÉSUMÉ: Alberta Transportation a recouche de 2.5 m de bentonite à environ 15 2 m de haut, un mur de soutènement composé de pieux de béton coulés en place a été construit à la culée de la culée ont permis de surveiller les déplacements du talus et du mur, ainsi que la baisse des pressions interstitielles ge dans un lit de rivière saturé occasionna

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