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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 51
  • 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
    A contribution to financial and geomechanical pit optimisation
    (Reading Matrix, 2012-11-01) Grenon, Martin; Ngoma Bolusala, Christian
    Surface mine financial optimisation and geomechanical design are not well integrated. This paper presents a case study where both the net present value (NPV) and the design of slopes, for various ultimate pit scenarios, were assessed based on the geological block model. In the first stage, the stability of the excavations was evaluated using limit equilibrium techniques. This resulted in the construction of susceptibility maps based on the factor of safety (FS) and the probability of failure (PF). The financial and geomechanical benefits associated with different scenarios were employed to arrive at an optimised design.
  • PublicationRestreint
    Assessing rock mass UCS anisotropy using a coupled DFN-DEM approach at a surface mining project in Artic Canada
    (2014-10-01) Kapinga Kalala, Iris; Grenon, Martin; Bruneau, Geneviève.
    A coupled DFN-DEM approach was used to evaluate the anisotropy of rock mass mechanical compressive strength (UCS) at Representative Elemental Volume (REV) at the feasibility stage of an open pit mining project located in Nunavut Territory in northern Canada. The paper presents modelling work performed to define the rock mass UCS based on field data and on laboratory testing results. In particular, the influence of the in-situ rock mass structural properties variations on the rock mass UCS is studied. To begin with, a discussion is presented on the difficulty to account for the anisotropy of the rock mass UCS at engineering scale. Coupled DFN-DEM modelling was shown to be useful although still rarely used mainly due to computing time limitation. In this paper, the modelling workflow is outlined. DFN modelling results are presented - several DFNs were modelled to fully represent the spectrum of possible structural regimes at the site. The DFN-DEM calibration process for simulating rock mass samples at REV size is also presented. DFN-DEM models were created for all generated DFNs – representing the observed spectrum of the structural rock mass properties. The rock mass UCS was evaluated for all samples and the anisotropy of the rock mass UCS was then calculated. The results suggest that for this mining site, the rock mass at REV size is strongly anisotropic. Furthermore, they suggest that the rock mass structural variability significantly affects the rock mass anisotropy. The results not only highlight the possibilities associated with DFNDEM modelling in characterizing rock mass anisotropy at the engineering scale, they also provide a systematic way to assess the variability in rock mass properties anisotropy for engineering works.
  • 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
  • PublicationAccès libre
    Capturing the complete stress–strain behaviour of jointed rock using a numerical approach
    (John Wiley & Sons, Ltd., 2015-01-10) Esmaieli, Kamran; Hadjigeorgiou, John; Grenon, Martin
    This paper presents the results of a series of numerical experiments using the synthetic rock mass (SRM) approach to quantify the behaviour of jointed rock masses. Field data from a massive sulphide rock mass, at the Brunswick mine, were used to develop a discrete fracture network (DFN). The constructed DFN model was subsequently subjected to random sampling whereby 40 cubic samples, of height to width ratio of two, and of varying widths (0.05 to 10 m) were isolated. The discrete fracture samples were linked to 3D bonded particle models to generate representative SRM models for each sample size. This approach simulated the jointed rock mass as an assembly of fractures embedded into the rock matrix. The SRM samples were submitted to uniaxial loading, and the complete stress–strain behaviour of each specimen was recorded. This approach provided a way to determine the complex constitutive behaviour of large-scale rock mass samples. This is often difficult or not possible to achieve in the laboratory. The numerical experiments suggested that higher post-peak modulus values were obtained for smaller samples and lower values for larger sample sizes. Furthermore, the observed deviation of the recorded post-peak modulus values decreased with sample size. The ratio of residual strength of rock mass samples per uniaxial compressive strength intact increases moderately with sample size. Consequently, for the investigated massive sulphide rock mass, the pre-peak and post-peak representative elemental volume size was found to be the same (7 × 7 × 14 m).
  • PublicationRestreint
    Properties of large-scale geological features and seismic responses affecting strainburst potential in deep underground mines
    (Société internationale de mécanique des roches, 2018-11-01) Grenon, Martin; Morissette, Philippe; Goulet, Audrey; Woodward, Kyle; Wesseloo, Johan
    Strainburst refers to local small seismic events generating shallow spalling with violent ejection of fragments in an active development heading. This rockburst category may affect worker safety and mine productivity. This paper conducts a preliminary study investigating properties of large-scale geological features, mine operational context, and both aseismic and seismic responses generating strainbursts. Using the LaRonde mine as a case study, key parameters influencing strainburst occurrence and severity are defined and highlighted. The distance to a lithological contact and the orientation of the drift are parameters that affect strainburst potential and severity at LaRonde. The analysed bursts were seismically triggered or self-initiated. The analysed seismic events generating strainbursts had a local magnitude of-0.7 ± 0.5 on average and were located between 3 and 58 meters from the damage. Finally, strainbursts mostly occur within five days after a development blast.
  • 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.
  • PublicationRestreint
    Blast induced seismic response at the Goldcorp Eleonore Mine : identification, delineation and characterization
    (Society for Rock Mechanics and Engineering Geology, 2018-10-01) Tuleau, Jocelyn; Woodward, Kyle; Grenon, Martin; Lajoie, Pierre-Luc
    Seismicity in the mining environment is controlled by factors including stope and development blasting, the presence of geological features, and stress conditions. The Goldcorp Eleonore mine is located in the James Bay region, Quebec, Canada. It’s 800-metre depth makes Eleonore a relatively shallow mine when compared to other seismically active Canadian mines. Despite the mine’s depth, seismicity is a geotechnical hazard that may be arguably attributed to a particular stress regime and complex geology. An improved understanding of the seismic responses following blasting can decrease seismic risk and is beneficial to mine planning and productivity. Seismic responses to blasting were spatially delineated using a density-based clustering approach. The spatial characteristics of clusters were assessed using Principal Component Analysis (PCA). The best-fit planar representation of seismic event clusters was identified. The orientation of the best-fit planar representations was then compared to the mine’s local jointing to investigate the causative seismic source mechanism for these events. The results of this study show that seismicity is linked to local jointing, and in particular to the different structural domains.
  • 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.