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TitleGeotechnical data from a prehistoric landslide site at Low, Quebec
AuthorWang, B
SourceGeoHazards 7 - Canmore 2018: The 7th Canadian Geohazards Conference, proceedings; 103, 2018 p. 1-8
Alt SeriesNatural Resources Canada, Contribution Series 20170307
PublisherCanadian Geotechnical Society
MeetingGeoHazards 7 - The 7th Canadian Geohazards Conference; Canmore, AB; CA; June 3-6, 2018
Mediapaper; digital
File formatpdf
Lat/Long WENS -76.0000 -75.5000 46.0000 45.7500
Subjectssurficial geology/geomorphology; engineering geology; landslides; marine clays; sensitive clays; soils; shear tests; penetrometers; shear strength; pore pressures; grain size distribution; plasticity; plastic limit analysis; liquid limit analyses; Champlain Sea Clay; Phanerozoic; Cenozoic; Quaternary
Illustrationslocation maps; geophysical images; tables; profiles; graphs
ProgramPublic Safety Geoscience Assessing Earthquake Geohazards
Released2018 06 01
AbstractGeotechnical site investigations were conducted at a prehistoric landslide site at Low, Quebec. The landslide occurred in Champlain Sea clay of up to 43 m thick. Cone penetrometer tests (CPT) and vane shear tests resulted in a CPT bearing factor Nkt of 17.0 for the clay undisturbed by the landslide and 11.5 for that of the disturbed materials. A correlation of the peak undrained shear strength (Cu) of the undisturbed clay was found to be Cu = 28 + 1.42 H (kPa), where H (m) is depth from the pre-failure ground surface.
Summary(Plain Language Summary, not published)
Geotechnical studies are being carried at a prehistoric landslide site in Low, Quebec. The landslide occurred in Champlain Sea clay and was triggered by an earthquake about a thousand years ago. It is one of three landslides selected for a study to determine the magnitude of the earthquake. A field investigation program was carried out at the Low site. The program consisted of field measurements of the sediment thickness, shear strength tests of the sediments, soil sampling and laboratory testing. The sediment was measured to be up to 43 m thick. The clay shear strength was found to follow a linear correlation with depth. A failure surface was found to be about 10 to 18 m below the current ground surface. The paper presents the geotechnical data obtained from the field and laboratory tests. The results are expected to be useful for researchers and practitioners dealing with similar problems in the region.

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