68th Canadian Geotechnical Conference and 7th Canadian Permafrost Conference

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

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

Barry Meays, Thurber Engineering Ltd. (Canada)
Don Proudfoot, Thurber Engineering Ltd. (Canada)
Roger Skirrow, Alberta Transportation - Geotechnical and Materials Section (Canada)
Ed Szmata, Alberta Transportation - Construction Branch (Canada)

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.