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TitleGeotechnical test results at a prehistoric landslide site in Breckenridge, southwestern Quebec
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorWang, B
SourceGeological Survey of Canada, Open File 8013, 2016, 23 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is superceded by Geotechnical test results at a prehistoric landslide site in Breckenridge, southwestern Quebec
File formatpdf
Lat/Long WENS -76.0000 -75.7500 45.5000 45.4167
Subjectsengineering geology; soils science; surficial geology/geomorphology; Health and Safety; landslides; health hazards; slope failures; slope stability; slope stability analyses; slope deposits; overburden thickness; boreholes; geophysical logging; earthquake mechanisms; earthquakes; soils; soil properties; Champlain Sea; Champlain Sea deposits; Quaternary
Illustrationslocation maps; tables; graphs; profiles
ProgramPublic Safety Geoscience Western Canada Geohazards Project
Released2016 06 03
AbstractGeotechnical field testing was conducted in and around a landslide occurred about 1020 cal BP in Breckenridge, southwestern Quebec. The objective of the study is to investigate the magnitude of an earthquake previously hypothesized to have triggered this and other landslides in the region. The purpose of this Open File is to document the data obtained from the Breckenridge landslide site. The landslide is about 980 m long and 370 m wide. Four cone penetration tests (CPT) were conducted to depths ranging from 37 m to 55 m. Two CPTs were inside the landslide scar and two outside. Field vane shear tests (VST) were carried out at three CPT locations. The CPT cone bearing factor Nkt was calibrated to be 11.5. The soil undrained shear strength (Su) was found to have a correlation of Su = 15 + 2.66 H (kPa), where H is depth in meters from the original ground surface elevation at the head scarp. All the CPT data consistently show the same trend for the undisturbed materials. The slip surface was found to be at about 15 m depth from the original ground surface.
Summary(Plain Language Summary, not published)
Geotechnical field tests were carried out at a prehistoric landslide site in Breckenridge, southwestern Quebec. The landslide was triggered by an earthquake about 1000 year ago. The purpose of the tests is to characterize the soils and to determine the soil strength properties. The parameters will be used for reconstructing a slope model to determine the magnitude of the earthquake. A metal cone was pushed down into the ground to get a continuous profile of the soil bearing resistance. A metal vane was also used to test the soil shear resistance at targeted depths. The vane test results are used to calibrate the cone data. We conducted tests at four locations and found that the soils are very consistent at all locations. We found a correlation of the soil strength parameters. We also detected the location of the landslide slip surface, which will help reconstruct the slope model. This Open File is to report the test results.

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