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Personne :
Grenon, Martin

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Grenon

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Martin

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Université Laval. Département de génie des mines, de la métallurgie et des matériaux

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ncf10580926

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Résultats de recherche

Voici les éléments 1 - 10 sur 17
  • PublicationRestreint
    Back analysis of the west wall slope failure at LAB Chrysotile mine
    (2013-08-01) Caudal, Philippe; Amoushahi, Sina; Grenon, Martin
    This paper presents a case study in which a slope failure was observed on the west wall of the LAB Chrysotile mine in the vicinity of the main ramp in January 2010. Airborne LiDAR results were used to evaluate slope geometry before and after the failure occurred. Back analysis of the failure was performed to assess rock mass properties at the slope scale using various numerical techniques: limit equilibrium, finite elements and fracture networks. The various approaches correlated well with field observations.
  • PublicationAccès libre
    Inter-ramp and bench design of open-pit mines : the Portage pit case study
    (Conseil national de recherches du Canada, 2011-10-21) Laflamme, Amélie-Julie; Grenon, Martin
    Cet article présente une méthodologie intégrée pour évaluer la stabilité structurale d’une pente aux niveaux de l’inter-rampe et du gradin, et ce, à partir d’une étude de cas. Des algorithmes robustes ont été développés et implantés afin de calculer, aux niveaux inter-rampe et gradin, les orientations et la stabilité des pentes à l’aide de données compatibles avec la structure de la base de données d’un logiciel commercial pour la conception de mines. Des analyses de stabilité multicritères ont été réalisées à partir des différents critères de conception. Des cartes de susceptibilité, qui permettent d’identifier les zones potentiellement problématiques dans la fosse, ont été produites. Les résultats obtenus suggèrent que les angles inter-rampe ne présentent pas de problèmes d’instabilité sur toute la surface de la fosse. Au niveau des gradins, des zones d’instabilité potentielles ont été identifiées à l’intérieur de deux domaines structuraux totalisant 6 % de la surface de la fosse.
  • PublicationRestreint
    Stope performance assessment at the Goldcorp Eleonore mine using bivariate analysis
    (ISRM, 2017-10-02) Guido, Sébastien; Grenon, Martin; Germain, Paul
    Comparing stope performance relative to the engineering design is of paramount importance for any mining operation. A database was created of 105 stopes mined between 170 m and 800 m below surface from July 2014 to November 2016 at the Goldcorp Eleonore mine. The database consists of more than 20 parameters defining spatial, mining, geometrical, geological, drill-and-blast, and temporal stope properties. Univariate and bivariate statistical analyses were conducted using the database to better understand the root causes of stope performance. The study has allowed parameters controlling stope performance to be identified. These are the spatial localization of the stope (mining horizon, mining lenses, and central location within the orebody), the mining method, and the orientation of the major structures relative to stope orientation, the global stope drilling pattern and the stand-up time.
  • PublicationAccès libre
    Integrated geotechnical feasibility analysis for an open pit mine in the canadian arctic
    (2011-09-01) Hadjigeorgiou, John; Grenon, Martin; Kabuya Mukendi, Joseph; Leblanc, Denis; Matte, Pierre
    This paper presents the geotechnical results of a comprehensive feasibility case study for the Tiriganiaq pit of the Meliadine project in the Canadian arctic. A geomechanical model was constructed based on the ore reserve block model, and field and laboratory data collection campaigns. The results of oriented core logging were used to identify and zone the mine. Working in parallel with the pit optimization process a series of comprehensive slope stability analyses were undertaken on a block by block basis on selected optimised pits. The innovation of the undertaken approach resides in the smooth integration of the geological and geotechnical models with the optimised ultimate pit geometry to provide input for the slope stability analysis. Rather than working with “representative” slope geometries the actual planned slope geometries were used to compute the slope orientation at bench and inter-ramps levels using Geographical Information Systems (GIS) algorithms. This has allowed the stability analysis of the complete 3D numerical mine model and facilitates the identification of potentially unstable zones. The stability analyses were based on deterministic and probabilistic limit equilibrium techniques. It was possible to investigate the stability of all benches and inter-ramps for the ultimate pit defined by the block model. The factor of safety (FS) and probability of failure (PF) were assessed for every block of the optimised pit. In order to quantify the impact of the prevailing geotechnical conditions on the proposed pit shells a series of multi-criteria stability analyses were employed to assess the potential for localised instability.
  • PublicationAccès libre
    Suivi LiDAR et analyse de la stabilité d'un glissement de versant à la mine LAB Chrysotile, Black Lake, Québec, Canada
    (2014-04-01) Caudal, Philippe; Grenon, Martin; Fabre, Denis
    L’objet de cet article est de présenter le cas d’étude d’un glissement actif depuis juillet 2012 sur le mur Est de la mine LAB Chrysotile, Québec, Canada. Un suivi LiDAR, échelonné sur une période de 18 mois à partir du 29 juin 2012, a permis d’obtenir une série de modèles numériques de terrain (MNT) de la pente minière avant et après la rupture du mur Est. Ces MNT ont été utilisés pour reconstituer et quantifier les volumes déplacés. Ils ont été également utilisés pour la rétro-analyse visant à définir les paramètres des différents domaines géomécaniques des roches constituant le massif en utilisant la méthode des tranches sur des profils de pentes obtenus à l’aide des données LiDAR. Finalement, ces profils sont repris pour réaliser une analyse prospective préliminaire de l’impact du rehaussement de la nappe dont le résultat indique que celui-ci fera augmenter le facteur de sécurité.
  • PublicationAccès libre
    Établissement de scénarios d’accélération et de vitesse de grands glissements rocheux actifs : le cas de Black Lake
    (GEOQuébec, 2015-09-01) Leblanc, Jonathan; Grenon, Martin; Locat, Jacques; Turmel, Dominique
    Since 2010, multiple landslides happened in the vicinity of LAB D’Amiante du Canada (LAC) mine (Thetford Mines, Québec, Canada). In 2010, a landslide affected the west wall of the main pit. In July 2012, another landslide affected the South-Eastern portion of the main pit. The 2012 landslide is still active, and a total volume of 50 million m3 may be mobilised. Furthermore, the mine is not anymore in operation, and the water level in the open pit is rising. In the case of a brutal acceleration of the landslide, a wave may be produced. In order to analyse this wave and its potential effects, acceleration and speed scenarios need to be elaborated. A description of the landslide will first be made, followed by the elaboration of speed and acceleration scenarios, based on documented cases and numerical simulations.
  • PublicationAccès libre
    Caractérisation et surveillance d’un glissement rocheux actif d’une mine à ciel ouvert en utilisant le LiDAR
    (Société canadienne de géotechnique, 2014-06-01) Caudal, Philippe; Grenon, Martin; Locat, Jacques; Turmel, Dominique
    En Juillet 2012, une large rupture de pente s’est produite sur le mur Est de la mine LAB Chrysotile de Thetford Mines Québec, Canada. Cette rupture de pente a eu un impact irrémédiable sur la route régionale située au sommet de la pente, affectant l'économie des communes environnantes. L’objet de cet article est de comprendre ce glissement de terrain en utilisant à la fois le LiDAR à balayage laser terrestre (TLS) et aérien (ALS) . Depuis 2010, trois ALS et douze TLS ont été réalisés pour caractériser et surveiller le glissement. Le balayage laser a d'abord été utilisé pour étudier la géométrie du glissement : son volume, la topographie, la taille et l'orientation de l'escarpement, etc. Il a ensuite été utilisé pour étudier les déplacements 3D pour avoir une meilleure compréhension de la cinématique du glissement. Cet article montre clairement la capacité du balayage LiDAR à fournir des informations quantitatives pertinentes sur la masse rocheuse en mouvement.
  • PublicationAccès libre
    Integrated structural stability analysis for preliminary open pit design
    (ScienceDirect, 2009-11-26) Hadjigeorgiou, John; Grenon, Martin
    A design module has been developed for integrating slope stability analysis into the data management, ore reserve and pit optimisation processes of an open pit mine. The developed slope stability analysis tools were successfully implemented along the full projected pit model of a surface mine in Canada. Undertaken stability analyses included both kinematic and limit equilibrium stability analysis for bench and interramp design. The developed stability analysis modules employed geographical information systems (GIS) techniques to provide visualization tools and establish stability susceptibility zones along the pit. This approach facilitated the selection of acceptable slope design criteria for the pit. A case study was used to illustrate the developed methodology and tools. This approach led to an improved design for the optimised 3D pit configuration and can facilitate communication between the mine planning and geotechnical groups. This can contribute to a better understanding of the economic impact of the different slope and pit design scenarios. Given that open pit design is an iterative process, the opportunity of having design tools that can readily accommodate the use of updated data and explore different options provide tangible economic benefits.
  • PublicationRestreint
    Evaluating the probability of sliding for mine slope design based on various fracture orientation clusterings
    (2013-08-01) Grenon, Martin; Kabuya Mukendi, Joseph
    This paper presents two case studies where fracture set orientation was quantified using three methods: a simple fracture pole grouping, a Fisher distribution and a Kent distribution. The three fracture orientation representations were then used as inputs for kinematic slope stability analysis. Differences showed up in the probability of sliding for all instability modes considered.
  • PublicationAccès libre
    Analysis of a large rock slope failure on the east wall of the LAB Chrysotile Mine in Canada: back analysis, Impact of water infilling and mining activity
    (Springer, 2016-10-24) Caudal, Philippe; Amoushahi, Sina; Grenon, Martin; Locat, Jacques; Turmel, Dominique
    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.