Groundwater seepage and an increased lateral earth pressure coefficient at rest (K0) increase the potential for triggering large-scale landslides in sensitive clays. After the failure is tr...

Modeling of Initial Stresses and Seepage for Large Deformation Finite-Element Simulation of Sensitive Clay Landslides

Sensitive clays are prone to various types of landslides Among these are flow slides that are able to affect hectares of land Moreover, debris from these flow slides has a high mobility with run out distance of hundreds of meters, even in relatively flat areas, are quite common In the context of hazard mapping, mobility of the debris is also an important factors to consider In this context, a parametric analysis using simplified geometries is undertaken in order to evaluate the run out characteristics of these flows (such has the length of the run out area and the lateral spread of the debris) as a function of the rheological parameters such as the yield stress and viscosity In order to proceed with the parametric analysis, a newly developed 3D numerical model was used

Parametric Analysis of the Mobility of Debris from Flow Slides in Sensitive Clays

Sensitive clays, mostly found in Eastern Canada and Scandinavia, are prone to various types of landslides; among them are flowslides that may affect hectares of land. Debris from those slides has high mobility, with runout distances that may extend over hundreds of meters in relatively flat and non-channelized terrain. Most studies on the mobility use apparent rheological properties to back-calculate the runout behavior of these landslides. This works well for back-analyses of landslides but is of little help in a context of hazard mapping, where prospective analysis of future landslides is necessary. In this study, a new factor, using the destructuration index concept, is introduced to estimate the remaining energy available as kinetic energy for runout after the remolding of the sensitive clay: the energy reduction factor (FER). Using the FER allows the use of real rheological data acquired with a rheometer to analyze the post-failure behavior of a flowslide in sensitive clays. This method is applied on a sensitive clay landslide which took place in Quebec and where rheological and geotechnical data are available.

The energy reduction factor (FER) to model sensitive clay flowslides using in situ geotechnical and rheological data

The Black Lake rockslide is located on the east wall of an open-pit mine initially operated by LAB Chrysotile near Thetford Mines, Quebec. Movements were observed in July 2012 when a volume of 2.0 ...

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Tsunami generation by potential, partially submerged rockslides in an abandoned open-pit mine: the case of Black Lake, Quebec, Canada

The landslide of 1908 in Notre-Dame-de-la-Salette, Quebec, was the deadliest event occurring in sensitive clays of Eastern Canada, causing 33 deaths Of these, 26 are associated with the tsunami generated impact of water and ice on the opposite bank A LiDAR survey of the sector, and a geotechnical investigation were carried out respectively in 2009 and 2010 to characterize this landslide Covering an area of 65 ha, the soil mass carried is estimated at nearly 12 million m3 The paper describes the event, reports the results of the investigation and discusses the tsunami caused by the debris of the landslide The tsunami approach includes modeling both the kinematics of the slide and the wave

M. Létourneau

Papers

The 1908 Disaster of Notre-Dame-de-la-Salette, Québec, Canada: Analysis of the Landslide and Tsunami