Landslides at the Rock Glacier, Highwood Pass.

摘要

Rock Glacier Site is located 2 km north of Highwood Pass in Kananaskis Country, Alberta. Toppling and related slope movements at this site were investigated. Preliminary work and extensive field mapping produced an airphoto interpretation, bedrock geology map, and topographical map. In situ field testing and laboratory tests indicated that the external force driving the toppling process was frost action and heaving of a weathered shale zone. A stability analysis of the slope included examining rock falls, rupture surface formation, and slides. Rock falls were determined to be a dominant form of slope movements. The development of rupture surfaces was found to occur when the amount of angular rotation of the toppling rock mass was between 13 and 16 degrees. The stability of slopes along fully developed rupture surfaces was found to be of concern. Finally, there were some implications for Highway 40, located at the toe of the slope.