Summary
On January 9, 1965, the Hope slide occurred in the Casade Mountains of British Columbia and buried 4.5 km of B.C. highway number 3. Two minor earthquakes, with epicentres in the vicinity of the slide, are cited as the most probable cause of failure. Analysis of the pre and post slide topography defined the centres of gravity of the slide mass both before and after failure. The slope of the line joining the centres of gravity was equated to the apparent angle of friction of the slide path. This slope was found to be very similar to the value of the ultimate friction angle in shear tests on the slide debris.
Résumé
Le glissement de Hope, dans les monts Cascades de Colombie Britannique, eut lieu le 9 janvier 1965, et recouvrât 4.5 km de l’autoroute No. 3. Deux secousses telluriques, dans les environs du glissement, furent citées comme cause probable de la rupture. L’analyse topographique ante- et post-glissement a défini les centres de gravité de la masse du glissement avant et après la rupture. La pente de la ligne joignant les centres de gravité equivaut à l’angle de friction apparent le long du parcours de rupture. Cette pente ressemble becaucoup à l’angle de friction ultime obtenu de l’analyse en cisaillement de débris du glissement.
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Dept. of Civil Engineering University of Alberta, Edmonton, Alberta, Canada, T6G 2E1
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Bruce, I., Cruden, D. The dynamics of the hope slide. Bulletin of the International Association of Engineering Geology 16, 94–98 (1977). https://doi.org/10.1007/BF02591458
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DOI: https://doi.org/10.1007/BF02591458