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TitleGeotechnical investigations of a large landslide site at Quyon, Québec
AuthorWang, B; Brooks, G R; Hunter, J A M
SourceProceedings of the 68th Canadian Geotechnical Conference and 7th Canadian Permafrost Conference; 2015, 8 pages
Year2015
Alt SeriesEarth Sciences Sector, Contribution Series 20150093
PublisherCanadian Geotechnical Society
MeetingGeoQuébec2015 68th Canadian Geotechnical Conference and 7th Canadian Permafrost Conference; Quebec City; CA; September 20-23, 2015
Documentbook
Lang.English
Mediapaper; on-line; digital
RelatedThis publication is related to Wang, B; Brooks, G R; Hunter, J A M; (2015). Preliminary data from 2014 geotechnical investigations of a large landslide site at Quyon, Québec; Preliminary data from 2014 geotechnical investigations of a large landslide site at Quyon, Québec; Preliminary data from 2014 geotechnical investigations of a large landslide site at Quyon, Québec, 68th Canadian Geotechnical Conference and 7th Canadian Permafrost Conference, abstracts
File formatpdf
ProvinceQuebec
NTS31F/09
AreaQuyon
Lat/Long WENS -74.5000 -74.0000 45.7500 45.5000
Subjectsgeophysics; hydrogeology; soils science; earthquake damage; earthquake magnitudes; earthquakes; earthquake risk; slope failures; pore fluids; pore pressures
Illustrationslidar image; location maps; seismic survey; graphs
ProgramWestern Canada Geohazards Project, Public Safety Geoscience
AbstractGeotechnical investigations were conducted at a large landslide site near Quyon, Québec. Previous studies concluded that the landslide was triggered by an earthquake about a thousand years ago. The current study continues the previous work to confirm the slope failure mechanism and the earthquake magnitude. This paper presents the results of the first year¿s study. Cone Penetrometer Tests (CPT), field Vane Shear Tests (VST) and laboratory tests were conducted. The CPT bearing factor Nkt is determined to be a constant 10.5. The CPT pore water bearing factor Ndu is dependent on the pore pressure parameter Bq. The soil undrained shear strength (Su) ranged from 30 kPa to about 250 kPa. A clay layer of Su lower than 100 kPa exists at all the undisturbed locations, but is either absent or dislocated within the landslide zone.
Summary(Plain Language Summary, not published)
A large landslide has been identified from a recent study near Quyon, Québec. The landslide covers an area approximately 14 km long and up to 4 km wide along the Quyon River, and is situated within Champlain Sea soft sediments. It has previously been interpreted to have been triggered by an earthquake about a thousand years ago. Geotechnical studies were conducted to investigate the minimum earthquake magnitude required to trigger the landslide. This paper presents the field and laboratory data collected from the 2014-2015 geotechnical investigations. The clay sediments were mapped with a handheld device at about 180 locations across the landslide zone. The soil shear strengths were measured with geotechnical devices in nine boreholes at six locations. Laboratory tests were also done on soil samples collected from the boreholes. The field and lab test results helped in understanding the ground conditions in and around the landslide zone, which will contribute to understanding the slope failure mechanism and hence the triggering earthquake magnitude.
GEOSCAN ID296637