A Case Study of a Landslide on Highway 6 South of Southey, SK

Harpreet Panesar

In the proceedings of: GeoVancouver 2016: 69th Canadian Geotechnical Conference

Session: GEOHAZARDS - I Climate Change Floods & Landslides

ABSTRACT: Pavement cracking on Highway 6 was noted at the beginning of October 2014. The site is located approximately 13 km south of Southey, Saskatchewan. The fill section is approximately 400 m long, and the embankment was up to 30 m high with a 2H: 1V side slope, east of the highway. The failure was located within the highest fill embankment section and was indicated by arc-shaped cracking on pavement surface, vertical displacement of the road surface, and deflection of the guardrail. The failure impacted a section of the highway approximately 70 m long. A detailed site investigation and slope stability study was conducted to develop a response plan. The analyses were conducted using both deterministic and probabilistic slope stability analyses. The analyses were performed for various potential slope failure mechanisms at representative cross-sections. This paper presents the results of geohazard risk assessment, terrain analysis, site investigation, instrumentation monitoring, numerical slope stability analysis and evaluation of remediation options.

RÉSUMÉ: La fissuration de la chaussée sur la route 6 a été noté au début de Octobre 2014. Le site est situé environ 13 km au sud de Southey, Saskatchewan. La section de remplissage est environ 400 m long, et le remblai était 30 m de haut avec une 2H: 1V pente latérale, est de l'autoroute. L'échec était à l'intérieur de la section de remplissage plus élevé et le remblai a le déplacement vertical de la surface de la route et la déviation de la glissière. L'échec a impacté un partie de la route environ 70 m de long. Une enquête détaillée de le site et une étude de la stabilité des pentes a été conduit pour développer un plan de réponse. Les analyses ont été conduit avec les études de la stabilité des pentes déterministe et probabiliste. Les document la présente surveillance de l'instrumentation, l'analyse numérique de la stabilité des pentes et l'évaluation des options d'remédiation.

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