Reconstruction of a roadway over an active landslide using lightweight cellular concrete

Allen Veenland, Shane Duval, Brad Dolton, Roger Skirrow

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

Session: Landslide/Ground Movement Impact on Infrastructures

ABSTRACT: Since the early 2000s, instability was noted along a section of Highway 762 located approximately 18 km southeast of Bragg Creek, Alberta, Canada. Distress to the pavement included significant cracking and surface undulation. Repairs consisting of pavement overlays and/or milling were conducted on approximately an annual basis in order to maintain an acceptable driving surface. A geotechnical investigation at the site revealed that the cause of the pavement distress was an underlying landslide. In late 2017, a 300 m section of the roadway was reconstructed. Key design elements used to unload the landslide included lowering the roadway grade and the novel use of lightweight cellular concrete (LCC) within the embankment. In total, approximately 5,600 m3 of LCC with a density of 475 kg/m3 were placed. Since reconstruction, no movement of the roadway has been noted and no maintenance has been required.

RÉSUMÉ: Depuis le début des années 2000, une partie de l'Autoroute 762, située à environ 18 km au sud-est de Bragg Creek, en Alberta, au Canada, est sujette à une instabilité. La chaussée présente d'importantes fissures et ondulations de la surface. Des réparations, qui consistaient à refaire le revêtement de la chaussée et/ou à fraiser, ont été réalisées approximativement tous les ans de façon à maintenir une surface de conduite acceptable. Une étude géotechnique sur le terrain a montré que la dégradation de la chaussée était due à un glissement de terrain sous-jaçent. Fin 2017, une section de 300 m de la chaussée a été reconstruite. Les éléments-clés pris en compte pour limiter les contraintes au niveau du glissement de terrain comprenaient l'abaissement du niveau de la chaussée et l'utilisation de béton cellulaire léger (LCC) pour le remblai. Depuis la reconstruction, aucun mouvement de la chaussée n'a été constaté et aucun entretien n'a été nécessaire.

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Cite this article:
Allen Veenland; Shane Duval; Brad Dolton; Roger Skirrow (2019) Reconstruction of a roadway over an active landslide using lightweight cellular concrete in GEO2019. Ottawa, Ontario: Canadian Geotechnical Society.

@article{Geo2019Paper261,author = Allen Veenland; Shane Duval; Brad Dolton; Roger Skirrow,title = Reconstruction of a roadway over an active landslide using lightweight cellular concrete ,year = 2019}