EUREKA RIVER LANDSLIDE, HWY 726:02 NEAR WORSLEY, ALBERTA: DESIGN AND CONSTRUCTION OF REMEDIAL MEASURES

Barry Meays, Don Proudfoot, Roger Skirrow, Ed Szmata

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

Session: Landslides and Slope Stability V / Mouvements de terrain et stabilité des pentes V

ABSTRACT: A number of landslides are affecting Highway 726 through the Eureka River valley in northwest Alberta, Canada. One of these sites required immediate attention. The site investigation revealed a deep-seated landslide in a weak, high plastic clay layer that toed out into the River 15 m below the highway. Remediation in 2012/2013 consisted of two lines of concrete piles constructed downslope of the highway spanning the landslide. The upper pile wall was tied back with two rows of grouted anchors. The lower, cantilever design pile wall was installed which acts to maintain lateral soil pressure against the upper wall. Other measures, such as EPS lightweight fill, were implemented in order to further reduce driving forces on the upper wall. This paper summarizes the geotechnical investigation, design, and repair measures, including instrumentation monitoring results at the remediated site.

RÉSUMÉ: L™autoroute 726 traversant la vallée de la rivière Eureka est affectée par plusieurs glissements de terrain. Une étude entreprise sur un site sensible a mis en évidence un glissement de terrain profond situé dans une couche d™argile molle à plasticité élevée, terminant dans l™emprise du cours d™eau à une élévation d™environ 15 m en dessous du niveau de la chaussée. En 2012/2013, deux murs de soutènement (pieux tangents en béton), furent construits en aval de la chaussée. Deux niveaux d™ancrages furent ajoutés au premier mur (supérieur). Le second mur (inférieur), en porte-à-faux, fut construit plus bas le long du talus afin de maintenir une pression latérale sur le mur supérieur. Des mesures additionnelles de protection, dont un remblai léger composé de blocs de polystyrène expansé, furent aussi adoptées afin de réduire les forces de poussée exercées sur le mur supérieur. Cet article présente les éléments pertinents de la reconnaissance et de la conception des techniques de mitigation, ainsi que les données de l™instrumentation du site.

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Cite this article:
Barry Meays; Don Proudfoot; Roger Skirrow; Ed Szmata (2015) EUREKA RIVER LANDSLIDE, HWY 726:02 NEAR WORSLEY, ALBERTA: DESIGN AND CONSTRUCTION OF REMEDIAL MEASURES in GEO2015. Ottawa, Ontario: Canadian Geotechnical Society.

@article{017,author = Barry Meays; Don Proudfoot; Roger Skirrow; Ed Szmata,title = EUREKA RIVER LANDSLIDE, HWY 726:02 NEAR WORSLEY, ALBERTA: DESIGN AND CONSTRUCTION OF REMEDIAL MEASURES,year = 2015}