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Analysis of a small debris slide in coastal Alaska
Journal article   Peer reviewed

Analysis of a small debris slide in coastal Alaska

Roy C Sidle and D N Swanston
Canadian Geotechnical Journal, Vol.19(2), pp.167-174
1982
url
https://doi.org/10.1139/t82-018View
Published Version

Abstract

apparent cohesion cohesion factors of safety mechanics of failure piezometric rise rooting strength Trap Bay (Alaska)
On October 1, 1980, a moderately intense storm at Trap Bay, Alaska, triggered a small debris slide in a forested midslope depression that was instrumented to record the maximum piezometric rise. 54% (3.68cm) of the total rain fell during the final 3h causing the soil mantle to become nearly saturated. Analysis of the mechanics of the failure showed that an apparent cohesion of 2.0kPa, probably due to rooting strength, was acting on the 43o hillslope. Calculated factors of safety for such thin, partially saturated soils are very sensitive to small changes in apparent cohesion and should be used with caution on such sites. -from Authors

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Engineering, Geological
Geosciences, Multidisciplinary

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