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

Grenon, Martin; Caudal, Philippe; Amoushahi, Sina; Turmel, Dominique; Locat, Jacques

doi:10.1007/s00603-016-1116-8

Cited by 21 publications

(14 citation statements)

References 3 publications

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“…3) was deducted based on mining company information, and no boring was made for this particular project in order to confirm this geological model. The results show that with geotechnical parameters reported in table 1 which are average values derived from rock mass characteristics provided by several modelling, laboratory testing and field measurement sources (see Grenon et al 2017 for all the details) and with cohesionless material (assumption reasonable given the actual large displacement of the failed mass), the factor of safety would be about unity when the water level is at an elevation of 45 m below sea level, i.e. when the pumping of the water by the mine was still active and the open pit was free of water.…”

Section: Landslide Volume and Geometry Scenariossupporting

confidence: 65%

“…Some of these more sophisticated models include Flow-3D which has already been used to reproduce physical model experiments (Basu and al. 2009), OpenFOAM which was used to model landslide on river banks that generated tsunami (Locat et al 2017), Fluent (Biscarini 2010) that was used to simulate the 1958 Lituya bay tsunami in a 2D simplified geometry or Smoothed particle hydrodynamics (SPH) codes that were also used to replicate laboratory experiments (e.g. Yeylaghi et al 2017).…”

Section: Analysis Of Numerical Modelling Resultsmentioning

confidence: 99%

“…Slope stability analysis previously carried out by Grenon et al (2017) andin Turmel et al (2016) analyses were used to define the volume and geometry of potential landslides. Geotechnics parameters were obtained with a back analysis of the July 2012 rockslide case on the open-pit east wall and by the use of informations provided by the mine.…”

Section: Methodsmentioning

confidence: 99%

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Tsunami generation by potential, partially submerged rockslides in an abandoned open-pit mine: the case of Black Lake, Quebec, Canada

et al. 2018

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Abstract:The Black Lake rockslide is located on the east wall of an open pit mine initially operated by LAB Chrysotile near Thetford Mines, Québec. Movements were observed in July 2012 when a volume of 20 M m³ was mobilized, destroying a large portion of the 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 tsunamis generated by possible partially submerged rockslides and to understand their 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 shows 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 will be completely filled. Mots-clés :Tsunami généré par un glissement de terrain, glissement partiellement submergé, modélisation numérique, mine à ciel ouvert, glissement rocheux actif.

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Section: Landslide Volume and Geometry Scenariossupporting

confidence: 65%

Section: Analysis Of Numerical Modelling Resultsmentioning

confidence: 99%

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Tsunami generation by potential, partially submerged rockslides in an abandoned open-pit mine: the case of Black Lake, Quebec, Canada

et al. 2018

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“…The software includes steady-state, finite element groundwater seepage analysis to which pore pressure, flow and gradient can be determined along with effective stress. The software has been previously adopted to perform numerical modelling in numerous studies (Coggan et al 2012;Coli et al 2008;Day et al 2017;Grenon et al 2017;Perras and Diederichs 2007;Sasaoka et al 2016;Smith 2016;Winn et al 2017;Zsaki 2010). RS 2 (Phase 2 9.02) was selected for the study given finite element capability, user friendly interface and relatively simple application.…”

Section: Model Methodologymentioning

confidence: 99%

Analysis of the influence of groundwater and the stress regime on bolt behaviour in underground coal mines

Smith

Ramandi

Zhang

et al. 2019

Int J Coal Sci Technol

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The service failure of rock bolts and cable bolts are frequently reported issues in underground coal mines. Whilst numerous experimental investigations concerned with the service failure of bolts have been conducted, numerical modelling offers an alternative approach in evaluating the factors contributing to service failures of bolts in underground mines. In this study, analysis of the influence of groundwater and tensile stress on bolts in underground coal mines was studied through the numerical modelling of a grouted bolt in the immediate roadway roof. Bolt tensile stress and groundwater dripping rates in the immediate roadway roof were analysed using a package based on finite element method to assess the effect of coal roof thickness and claystone bands, as main contributors of known service failures of bolts in roadways of underground coal mines. Increasing coal roof thickness was found to increase bolt dripping rates. Probable location of stress corrosion cracking (SCC) occurrence was established through examining the shift and increase in maximum bolt tensile stress that was exhibited along the bolt length with increasing coal roof thickness. Claystone bands situated at the top and centre horizon of a grouted bolt produced lower bolt dripping rates compared with scenarios with no claystone bands. Intersecting claystone bands at the centre horizon of a bolt for a fully grouted bolt could increase the likelihood of SCC corrosion and bolt failure by contributing to microbial corrosion processes and grout fracturing by tensile stress. This study improves the understanding the bolt failure associated with the presence of groundwater and changing stress environments, which in turn is imperative in formulating strategies to mitigate support element failures and improve the ground support viability.

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“…The estimated displaced volume was 5.0 × 10 7 m 3 . This failure is documented extensively in Grenon et al 2016. These references also present a detailed back-analysis of the east wall failure.…”

Section: Problem Descriptionmentioning

confidence: 96%

Deterministic and probabilistic stability analysis of a mining rock slope in the vicinity of a major public road — case study of the LAB Chrysotile mine in Canada

et al. 2018

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In recent years, several large open-pit mines have started operating in the province of Quebec in Canada, and some of the largest planned pits are located close to public infrastructure. Historically, large open-pit mining has seldom been done in many mining regions, such as the Abitibi region, where underground mines are the norm. As an integral part of achieving social acceptability of openpit mining, the stability of mining slopes must be carefully analyzed during the design process and the presence of public infrastructure near the slopes must be adequately considered. The province of Quebec does not have specific guidelines regarding such design considerations. This paper provides a short overview of the literature on some current practices regarding mining slope design close to public infrastructure. To demonstrate its applicability in the Quebec provincial context, the paper then investigates the stability of the west wall of the LAB Chrysotile open-pit mine in Thetford Mines (Quebec) near the new Road 112. Deterministic and probabilistic analyses were conducted using finite element shear strength reduction and limit equilibrium methods to investigate slope stability. The impact of pit infilling and rapid dewatering as well as long-term stability of the slope were investigated. The results of all analyses reveal that the current mining slopes at LAB Chrysotile are within acceptable design criteria limits. KEYWORDS open-pit mining, slope stability, public infrastructure, deterministic and probabilistic analysis, case study. CITATIONAmoushahi S, Grenon M, Locat J, & Turmel D. Deterministic and probabilistic stability analysis of a mining rock slope in the vicinity of a major public road-case study of the LAB Chrysotile mine in Canada.

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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

Cited by 21 publications

References 3 publications

Tsunami generation by potential, partially submerged rockslides in an abandoned open-pit mine: the case of Black Lake, Quebec, Canada

Tsunami generation by potential, partially submerged rockslides in an abandoned open-pit mine: the case of Black Lake, Quebec, Canada

Analysis of the influence of groundwater and the stress regime on bolt behaviour in underground coal mines

Deterministic and probabilistic stability analysis of a mining rock slope in the vicinity of a major public road — case study of the LAB Chrysotile mine in Canada

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