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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 10
  • PublicationRestreint
    Caractérisation structurale à l’aide de la photogrammétrie : mine Kikialik, Nunavik, Québec
    (Transportation Association of Canada = Association des tranports du Canada, 2012-10-01) Grenon, Martin; Dubois, Eric
    Digital photogrammetry was used to quantify the structural regime at Kikialik underground mine – Xstrata Nickel. This operation is located in the arctic region of Canada – where permafrost reaches 500 meters. The objective of this paper was to demonstrate that photogrammetry can be used routinely at this mining site to conduct structural mapping under difficult operational and climatic conditions. Photogrammetry can be well integrated to the geomechanical design workflow used at the mine. Simple practical field considerations are also provided
  • 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.
  • PublicationRestreint
    Assessing rock mass structural conditions in underground mining drifts using an integrated photogrammetry-DFN approach
    (2014-10-01) Grenon, Martin; Landry, Alex; Lajoie, Pierre-Luc
    This paper presents a case study in which photogrammetry was used to characterize the structural regime of a fractured rock mass at a hard-rock underground mine in development in northern Canada. The effectiveness of the photogrammetry tools used in an underground environment is discussed. The operational benefits from using such an approach at this site are also presented. The ability of photogrammetry to provide all the necessary inputs for DFN modelling is then addressed. Based on the photogrammetry results, DFN models are created and calibrated for several drifts at the mine site. For standard drift dimensions used at the mining site, possible wedge formation is evaluated. The geometrical characteristics of fracture networks intersecting the drift are also discussed. This integrated approach provides a robust and very effective means to assess structural conditions at this underground mine.
  • PublicationAccès libre
    Caractérisation statistique de la résistance en compression uniaxiale, de la résistance en tension et de l’indice de double poinçonnement du roc intact pour un projet minier
    (GEOQuébec, 2015-09-01) Boudreau, Catherine; Grenon, Martin; Bruneau, Geneviève.; Germain, Paul
    The design of excavation in underground mines relies on rock mass characterization. Intact rock properties are assessed according to the guidelines suggested by the International Society for Rock Mechanics. For laboratory testing, a minimum number of specimens must be analysed. This number is specific for a given test type. Nonetheless, rock variability, heterogeneity and anisotropy may suggest that a larger number of specimens could be necessary to fully assess rock mass properties. Furthermore, a characterization campaign must also respect certain practical and financial limitations. Using a case study from a Quebec mine site, this paper presents a methodology that allows directly linking the results of statistical analysis on campaign results to target levels of confidence for geotechnical data at all stages of a mining project.
  • 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.
  • PublicationRestreint
    Multivariate statistical analysis to investigate the seismic response to production blasting at Goldcorp Eleonore
    (American Rock Mechanics Association, 2018-06-30) Duchesne, Carl; Tuleau, Jocelyn; Grenon, Martin; Woodward, Kyle; Lajoie, Pierre-Luc
    The blasting of mining stopes is an important driver for mine seismicity. The factors controlling seismic response are not well understood. Mines mostly rely on the number of events and associated moment magnitudes. Geological and operational parameters are often neglected although known to be potential seismic drivers. A database was created for more than 83 production blasts between 230 m and 800 m below the surface from March 2016 to June 2017 at the Goldcorp Eleonore mine. The database consists of 78 parameters defining spatial, temporal, mining, geometrical, geological, drill-and-blast, and temporal blast properties and their associated seismic response. A multivariate statistical analysis was conducted using the created database to better understand the key factors controlling the seismic response of the rock mass to production blasting. The geological structures’ orientation and location relative to the stope, the stope geometry and the drilling pattern were identified as major factors contributing to induced seismicity at the Eleonore mine.
  • PublicationRestreint
    Contribution to drift design using discrete fracture network modelling at the Éléonore mine in Canada.
    (Australian Centre for Geomechanics, 2015-10-01) Hadjigeorgiou, John; Grenon, Martin; Landry, Alex; Lajoie, Pierre-Luc
    Discrete fracture networks (DFN) were used to model the structural regime around mining drifts at the Éléonore underground mine in Canada. The generated DFN models were subsequently used to investigate the creation of rock wedges along the drifts that may impact the stability of the excavations. Photogrammetry tools were used to characterise the rock mass structural regime and provide the input data for the generated DFN models. The impact of the choice of employed DFN model on the analysis was investigated with reference to the stability of excavations. A series of parametric analyses demonstrated the sensitivity of the model to variations in the properties of the structural regime. The benefits of using stochastic modelling to capture the inherent variability are reviewed. The paper concludes with a discussion on the requirements for the appropriate implementation of the DFN methodology as part of a probabilistic design approach for mining drifts.
  • PublicationAccès libre
    Slope orientation assessment for open-pit mines, using GIS-based algorithms
    (Computer Oriented Geological Society, 2010-12-20) Laflamme, Amélie-Julie; Grenon, Martin
    Standard stability analysis in geomechanical rock slope engineering for open-pit mines relies on a simplified representation of slope geometry, which does not take full advantage of available topographical data in the early design stages of a mining project; consequently, this may lead to nonoptimal slope design. The primary objective of this paper is to present a methodology that allows for the rigorous determination of interramp and bench face slope orientations on a digital elevation model (DEM) of a designed open pit. Common GIS slope algorithms were tested to assess slope orientations on the DEM of the Meadowbank mining project's Portage pit. Planar regression algorithms based on principal component analysis provided the best results at both the interramp and the bench face levels. The optimal sampling window for interramp was 21×21 cells, while a 9×9-cell window was best at the bench level. Subsequent slope stability analysis relying on those assessed slope orientations would provide a more realistic geometry for potential slope instabilities in the design pit. The presented methodology is flexible, and can be adapted depending on a given mine's block sizes and pit geometry.