The cliffs along sections of the Cabot Trail go through constant degradation from pounding surf at the base, as well as freeze/thaw and wetting/drying processes. As the roads through the trail are cut into these cliffs, significant slope movements can affect the roadways.
Parks Canada identified a tension crack on the edge of the Cabot Trail in the Cape Breton Highlands National Park. Indications of a slope failure were present at the site, including significant loss of material from the cliff. A large pile of rubble accumulated at the base and fresh rock faces exposed on the 200-foot cliff. An initial assessment was carried out to determine what temporary measures should be put in place to make the area safe for the public.
Following this assessment, a detailed site investigation was carried out, which involved a topographic survey, geologic mapping, boreholes and installing slope inclinometers to monitor movements. This data was used to complete a detailed design and prepare the specifications for the retaining structure, which uses a system of soldier piles, concrete lagging, and tie backs. Our team was on-site to provide inspection services during the construction of the structure.