Landslide Stabilization Using Wick Drain Dewatering of Artesian Groundwater Pressures – Highway 40:30 North of Hinton, Alberta

Ken Froese, Don Proudfoot, Roger Skirrow

Dans les comptes rendus d’articles de la conférence: GeoSt. John's 2019: 72nd Canadian Geotechnical Conference

Session: Landslide/Ground Movement Impact on Infrastructures

ABSTRACT: A slow-moving landslide affecting Highway 40:30, about 50 km northwest of Hinton, Alberta, was characterized by an arc-shaped cracking pattern crossing both lanes over a length of 150 m. Movement was measured at the base of a clay unit just above the contact with the underlying bedrock. Artesian pressures are believed to be the cause of the movement. The site was remediated using 3,511 wick drains installed to an average depth of 8.8 m through a gravel working platform to relieve the pressures and stabilize the site prior to grade-widening fill placed to accommodate detour traffic during a culvert replacement. According to the instrumentation results, there has been a noticeable decrease in the groundwater table with a commensurate reduction in movement rates. Although the crack pattern persists in the highway, the frequency of maintenance has decreased and it is expected to decrease further with time.

RÉSUMÉ: longueur. Le mosituée au-ique et une réduction correspondante des taux de et devra continuer de se réduire avec le temps.

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