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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
    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
    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.
  • PublicationRestreint
    Contributions to geomechanical stope optimization at the Goldcorp Eleonore Mine using statistical analysis.
    (International Society for Rock Mechanics and Rock Engineering, 2018-10-01) Guido, Sébastien; Grenon, Martin
    Stope performance is critical and is therefore usually assessed in mine operations. However, the factors controlling stope performance (such as overbreak) are not always fully understood. This was the case at the Goldcorp Eleonore operation, a relatively new mine located in a new mining area hundreds of kilometers from other existing operations. Still, stope design guidelines had to be elaborated to mitigate hanging wall overbreak and sustain a high mining rate from narrow vein stopes (as many as four per week) at acceptable costs. This paper presents a database of 105 stopes, mined between July 2014 and November 2016, which collated more than 50 parameters defining spatial, geometrical, geomechanical, geological and stope performance aspects. The points in this database were superimposed on the existing Stability Graph with ELOS curves (Clark, 1998) to assess its accuracy at Eleonore. This accuracy was shown to be limited and improvements were needed for forward analyses to be reliable. Improved predictions were obtained using various statistical analysis techniques such as multiple linear regressions (MLR), binary logistic regressions and principal component logistic regressions (PCLR) with parameters other than those used in the standard method. These statistical techniques and their results are presented in this paper and compared with those from the existing stability graph.
  • 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.
  • PublicationRestreint
    Assessing the contribution of seismicity to the demand on ground support elements at LaRonde mine
    (Australian Centre for Geomechanics, 2019-10-25) Grenon, Martin; Sasseville, Guillaume; Morissette, Philippe
    Seismic activity is known to affect the short- and long-term behavior of mining ground support, yet the influence of seismicity on ground support demand is not fully understood. The objective of this paper is to quantitatively assess the influence of various seismic parameters on the performance and degradation of ground support elements. A large database was created using the LaRonde mine (Quebec, Canada) as a case study, which consolidates information on the history of the rock support of an entire mine sector comprising 18.5 km of drifts: type, installation date, and behavior over time. This database was linked with the seismic event database available at the mine. Analyses identified various seismic parameters (i.e., large seismic events, number of seismic events, increase in apparent stress, b-value from the GutenbergRichter frequency-magnitude relationship, peak particle velocity, and energy radiated from the event) as precursory trends that may influence the performance and degradation of ground support elements. A key finding is that the number of seismic events and their magnitude are contributing factors in controlling the demand on ground support. A high number of seismic events and high local magnitude event have frequently been recorded before observing degradation on ground support elements. Another important finding is that the demand on ground support cannot entirely be explained by seismicity, but is also controlled by other site factors.
  • 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.
  • 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.
  • PublicationAccès libre
    Statistical characterisation of intact rock properties at a Canadian underground mining project
    (Australian Centre for Geomechanics, 2015-11-17) Boudreau, Catherine; Grenon, Martin; Caumartin, Richard; Bruneau, Geneviève.
    At the early stages of an underground mining project in the Canadian arctic, two successive field and laboratory campaigns were undertaken to evaluate intact rock properties (tensile strength and uniaxial compressive strength (UCS). All tests were performed according to the International Society for Rock Mechanics (ISRM) suggested methods. Intact rock properties were evaluated for several rock types. The obtained results were compared to target levels of confidence associated with different stages of a mining project. This was done using various statistical analysis methods. The results obtained for the different rock types are presented and discussed. A discussion is also provided on the level of confidence required for permanent versus temporary openings at underground mines. The approach can also be used as a tool to identify geotechnical drilling targets for subsequent characterisation campaigns.
  • PublicationRestreint
    Preliminary assessment of primary stope performance for a seismically active mine
    (American Rock Mechanics Association, 2019-07-01) McFadyen, Benoît; Grenon, Martin; Morissette, Philippe; Woodward, Kyle
    Evaluating stope performance is important for improving stope stability, production efficiency, and profitability. Underground mines are Operating at greater depths where workers and excavations are exposed to hazards such as seismic events, which are not addressed by standard empirical stope analysis. A stope database was created for 114 primary stopes (2.7–3 km below ground level) mined between November 2013 and August 2018. It considers geometrical, geomechanical, operational, and seismological parameters. To assess stope performance, reconciliation between the mined and the designed stope geometries was performed for the entire stope volume and on a surface-bysurface basis. Common stope performance metrics such as overbreak (OB), underbreak (UB), and equivalent linear overbreak sloughing were measured, as were other metrics like rock and backfill overbreak. Results of the univariate analysis showed the OB for the hangingwall of stope type A and the UB for the east and west walls of stope type B were the critical underperforming parameters. Bivariate analysis showed trends linking OB to Richter scale seismic events, rock quality designation, stand-up time, and spatial distribution. Trends were also found linking UB to planned volume and borehole standoff.
  • 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.