Showing papers by "Jacques Locat published in 2017"
TL;DR: In this paper, the authors present new high-resolution multibeam bathymetric, sub-bottom profiler and sediment core data collected in Lake Temiscouata, southeastern Quebec, the largest lake located within the influence of the Charlevoix-Kamouraska Seismic Zone (CKSZ).
32 citations
TL;DR: In this paper, a major mining slope failure occurred in July 2012 on the East wall of the LAB Chrysotile mine in Canada and the major consequence of this failure was the loss of the local highway (Road 112).
Abstract: A major mining slope failure occurred in July 2012 on the East wall of the LAB Chrysotile mine in Canada. The major consequence of this failure was the loss of the local highway (Road 112), the main commercial link between the region and the Northeast USA. LiDAR scanning and subsequent analyses were performed and enabled quantifying the geometry and kinematics of the failure area. Using this information, this paper presents the back analysis of the July 2012 failure. The analyses are performed using deterministic and probabilistic limit equilibrium analysis and finite-element shear strength reduction analysis modelling. The impact of pit water infilling on the slope stability is investigated. The impact of the mining activity in 2011 in the lower part of the slope is also investigated through a parametric analysis.
18 citations
TL;DR: In this article, a major mining slope failure occurred in July 2012 on the East wall of the LAB Chrysotile mine in Canada and the major consequence was the loss of the local highway (Road 112), the main economic link between the region and the Northeast USA.
Abstract: A major mining slope failure occurred in July 2012 on the East wall of the LAB Chrysotile mine in Canada. The major consequence of this failure was the loss of the local highway (Road 112), the main economic link between the region and the Northeast USA. This paper is part of a proposed integrated remote sensing–numerical modelling methodology to analyze mining rock slope stability. This paper presents the Light Detection and Ranging (LiDAR) monitoring of this slope failure. The main focus is the investigation of that rock slide using both terrestrial (TLS) and airborne (ALS) LiDAR scanning. Since 2010, four ALS and 14 TLS were performed to characterize and monitor the slide. First, laser scanning was used to investigate the geometry of the slide. The failure zone was 1100 m by 250 m in size with a mobilized volume of 25 hm3. Laser scanning was then used to investigate the rock slide’s 3D displacement, thereby enabling a better understanding of the sliding kinematics. The results clearly demonstrate the ability of the proposed approach to monitor and quantify large-scale rock mass failure. The slope was monitored for a period of 5 years, and the total displacement was measured at every survey. The maximum cumulative total displacement reached was 145 m. This paper clearly shows the ability of LiDAR scanning to provide valuable quantitative information on large rock mass failures involving very large displacements.
18 citations
01 Jan 2017
TL;DR: In this paper, 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 runout area and the lateral spread of the debris) as a function of the rheological parameters such as the yield stress and viscosity.
Abstract: 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
6 citations
01 Jan 2017
TL;DR: 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 as mentioned in this paper.
Abstract: 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
4 citations
24 May 2017
TL;DR: In this article, the impacts of climate change on clay-slope stability and how it can be integrated in landslide risk management to improve public safety are evaluated, and the unsaturated clay crust in slopes susceptible to superficial landslides will be characterized and instrumented.
Abstract: The Government of Quebec recently initiated the deployment of a vast groundwater pressures monitoring network in postglacial marine clays to document their variations in time and improve our understanding of the relationship between failure initiation and climate in clay slopes. This project aims at evaluating the impacts of climate change on clay-slope stability and how it can be integrated in landslide risk management to improve public safety. Hydrogeological data will be acquired at sites located throughout the Quebec Province’s post-glacial clay deposits to create a public georeferenced index of typical hydrogeological conditions. The project goes beyond the characterization of groundwater pressures and their variations in clay slopes. Indeed, slope deformation will be measured at several sites. Also, two sites in flat terrain will be instrumented in order to evaluate mechanical properties of clay layers in simple 1-D conditions and groundwater recharge. The unsaturated clay crust in slopes susceptible to superficial landslides will be characterized and instrumented. The current lifetime of the monitoring project has been set to a period of 25 years.
3 citations