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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 14
  • 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.
  • 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.
  • PublicationAccès libre
    Tsunami generation by potential, partially submerged rockslides in an abandoned open-pit mine : the case of Black Lake, Quebec, Canada
    (Conseil national de recherches du Canada, 2018-03-12) Leblanc, Jonathan; Locat, Ariane; Grenon, Martin; Harbitz, Carl B.; Locat, Jacques; Løvholt, Finn; Turmel, Dominique; Kim, Jihwan
    The Black Lake rockslide is located on the east wall of an open-pit mine initially operated by LAB Chrysotile near Thetford Mines, Quebec. Movements were observed in July 2012 when a volume of 2.0 × 107 m3 was mobilized, destroying a large portion of Highway 112. Mining operations ceased in 2012, causing the complete shutdown of the pumping system whose goal was to prevent the rise of water level in the pit. As the water level increases in the pit, it is essential to determine the potential of tsunami generation by possible partially submerged rockslides and to understand the potential impacts. A series of possible scenarios have been analysed with regard to velocity and acceleration of the potential rockslide as well as the corresponding wave generation and inundation. Results from the simulation show that when the factor of safety of the global slope is less than unity, inundation would not reach the potentially vulnerable infrastructures. Maximum wave height will vary as a function of the filling of the lake, and the lower wave height relative to water depth will happen when the lake is completely filled.
  • PublicationAccès libre
    Stability analysis of the 19A ore pass at Brunswick Mine using a two-stage numerical modeling approach
    (Springer, 2013-01-24) Esmaieli, Kamran; Hadjigeorgiou, John; Grenon, Martin
    The longevity of ore pass systems is an important consideration in underground mines. This is controlled to a degree by the structural stability of an ore pass which can be compromised by changes in the stress regime and the degree of fracturing of the rock mass. A failure mechanism specific to ore pass systems is damage on the ore pass wall by impact load or wear by material flow. Structural, stress and material flow-induced failure mechanisms interact with severe repercussions, although in most cases one mechanism is more dominant. This paper aims to provide a better understanding of the interaction of ore pass failure mechanisms in an operating mine. This can provide an aid in the design of ore pass systems. A two-stage numerical approach was used for the back analysis of an ore pass at Brunswick mine in Canada. The first stage in the analysis relied on a 3D boundary element analysis to define the stress regime in the vicinity of the ore pass. The second stage used a synthetic rock mass (SRM) model, constructed from a discrete fracture network, generated from quantitative rock mass field data. The fracture network geometry was introduced into a bonded particle model, in a particle flow code (PFC). Subsequently, the ore pass was excavated within the SRM model. A stability analysis quantified the extent of rock mass failure around the ore pass due to the interaction of pre-existing fractures and the failure of the intact rock bridges between these fractures. The resulting asymmetric failure patterns along the length of the ore pass were controlled to a large degree by the in situ fractures. The influence of particle flow impact was integrated into the model by projecting a discrete rock fragment against the ore pass walls represented by the SRM model. The numerical results illustrated that material impact on ore pass walls resulted in localized damage and accelerated the stress-induced failure.
  • 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.
  • PublicationAccès libre
    Quantifying the impact of small variations in fracture geometric characteristics on peak rock mass properties at a mining project using a coupled DFN–DEM approach
    (Elsevier, 2014-03-03) Kapinga Kalala, Iris; Grenon, Martin; Bruneau, Geneviève.
    Using field data from Agnico-Eagle’s Meliadine gold project located in Nunavut Territory in northern Canada, a coupled DFN–DEM approach was used to evaluate the rock mass mechanical properties at REV. Variability in the structural data gathered on site and the variability associated with the stochastic modeling process have an impact on discrete fracture model (DFN) properties. Through a sensitivity analysis, this paper assesses the influence of a variation in the DFN model input parameters’ values on the rock mass peak properties – uniaxial compressive strength, Young modulus and Poisson ratio. The results not only highlight the possibilities associated with DFN–DEM modeling in characterizing rock mass properties at the engineering scale, they also provide a systematic way to assess the critical structural parameters controlling the rock mass properties.
  • PublicationRestreint
    Discrete fracture network modelling using Coltop3D for rockfall potential assessment at Glacier Point, Yosemite Valley
    (2014-10-01) Jaboyedoff, M.; Matasci, Battista; Grenon, Martin; Stock, Greg M.
    We performed regional and site-specific structural studies of the cliff below Glacier Point in Yosemite Valley using Coltop 3D software analyses of previous Aerial Laser Scanning (ALS) and new local Terrestrial Laser Scanning (TLS) data. Coltop3D computes the spatial orientation (dip direction and dip) of each point within a point cloud with respect to its neighboring points. Coltop3D attributes a unique RGB color to each spatial orientation, allowing accurate identification of the major discontinuity sets. It is thus possible to quickly obtain a great number of measurements for joint orientations responsible for shaping a rock cliff. We performed manual measurements of fracture spacing and trace length on the point clouds using Polyworks (Innovmetric). The 3D view of the TLS dataset was compared to high-resolution photographs to accurately follow the discontinuity traces. We used these input parameters to generate a discrete fracture network (DFN) model of the fractured rock mass at Glacier point cliff. The model was calibrated to match field observations. Several possible DFN models of the site were generated. These DFN were then used to assess rockfall potential on specific sections of the Glacier Point cliff.
  • PublicationAccès libre
    A design methodology for rock slopes susceptible to wedge failure using fracture system modelling
    (Elsevier, 2007-10-23) Hadjigeorgiou, John; Grenon, Martin
    This paper demonstrates how the use of fracture system modelling can be linked to limit equilibrium analysis of rock slopes susceptible to wedge failure. The use of fracture systems highlights some of the limitations inherent in traditional structural data analysis and representation. Consequently it allows for more comprehensive input data that can be used for stability analysis of rock slopes. In particular the developed methodology addresses important issues such as spatial variability and wedge size distributions. The paper introduces a series of guidelines for interpretation of the results of rock slopes. The proposed techniques arguably result in an improved level of confidence in the design of rock slopes susceptible to wedge failure.
  • PublicationAccès libre
    Estimating geometrical and mechanical REV based on synthetic rock mass models at Brunswick Mine
    (ScienceDirect, 2010-06-17) Esmaieli, Kamran; Hadjigeorgiou, John; Grenon, Martin
    This paper uses a case study from Brunswick Mine in Canada to determine a representative elementary volume (REV) of a jointed rock mass in the vicinity of important underground infrastructure. The equivalent geometrical and mechanical property REV sizes were determined based on fracture systems modeling and numerical experiments on a synthetic rock mass. Structural data collected in massive sulphides were used to generate a large fracture system model (FSM), 40 m×40 m×40 m. This FSM was validated and subsequently sampled to procure 40 cubic specimens with a height to width ratio of 2 based on sample width from 0.05 to 10 m. The specimens were introduced into a 3D particle flow code (PFC3D) model to create synthetic rock mass (SRM) samples. The geometrical REV of the rock mass was determined based on the number of fractures in each sampled volume (P30) and the volumetric fracture intensity (P32) of the samples. The mechanical REV was estimated based on the uniaxial compressive strength (UCS) and elastic modulus (E) of the synthetic rock mass samples. The REV size of the rock mass was determined based on a series of statistical tests. The T-test was used to assess whether the means of the samples were statistically different from each other and the F-test to compare the calculated variance. Finally, the coefficient of variation, for the synthetic rock mass geometrical and mechanical properties, was plotted against sample size. For this particular site the estimated geometrical REV size of the rock mass was 3.5 m×3.5 m×7 m, while the mechanical property REV size was 7 m×7 m×14 m. Consequently, for engineering purposes the largest volume (7 m×7 m×14 m) can be considered as the REV size for this rock mass.
  • PublicationAccès libre
    Stability analysis of vertical excavations in hard rock by integrating a fracture system into a PFC model
    (ScienceDirect, 2008-11-20) Esmaieli, Kamran; Hadjigeorgiou, John; Grenon, Martin
    This paper presents an implementation of a comprehensive engineering approach to the analysis of the stability of vertical excavations in rock. This approach relies in the generation of discrete fracture systems to better capture the structural complexity of the rock mass. The resulting fracture system is consequently linked into a distinct element stress analysis. The particle flow code was selected as it potentially allows greater flexibility in representing a fracture system. In the first example a 3D fracture system was linked into a 2D PFC model. Although this has allowed for an improved quantification of stress structure interaction it necessitated important simplifications which may not be necessarily appropriate. These have been overcome by providing a complete integration of a 3D fracture system to a 3D PFC model. This will potentially lead into a design tool that adequately account for the stress structure interaction on the stability of vertical or near vertical excavations in hard rock.