Numerical modelling of observed fallouts in hard rock masses using an instantaneous cohesion-softening friction-hardening model

Edelbro, Catrin

doi:10.1016/j.tust.2008.11.004

Cited by 64 publications

(22 citation statements)

References 14 publications

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“…Many methods have been proposed to capture the failure shape around the excavation boundary [22,[43][44][45][46][47][48][49]. These researchers demonstrate that cohesion and frictional strength components in the Mohr-Coulomb and Hoek-Brown criteria cannot be mobilized simultaneously at low confinement during brittle failure.…”

Section: Influence Of Dilation On Brittle Rock Failurementioning

confidence: 99%

Influence of plastic shear strain and confinement-dependent rock dilation on rock failure and displacement near an excavation boundary

Zhao

Cai

2010

International Journal of Rock Mechanics and Mining Sciences

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Section: Influence Of Dilation On Brittle Rock Failurementioning

confidence: 99%

Influence of plastic shear strain and confinement-dependent rock dilation on rock failure and displacement near an excavation boundary

Zhao

Cai

2010

International Journal of Rock Mechanics and Mining Sciences

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“…This value was selected based on the methodology of Walton & Diederichs [12] and through comparison with the results obtained using the mobilized dilation angle model. The "predictive" CWFS parameters were obtained based on the laboratory UCS and the correlation with CI proposed by Perras & Diederichs [13] as well as a review of back analyzed brittle strength parameters for granitic rocks available in the literature [4][5][6]14]. The strength parameters for the perfectly plastic model were obtained using values of UCS = 220 MPa and mi = 17 obtained from laboratory compression testing data and a GSI of 80 as per the methodology of Hoek et al [1].…”

Section: Comparison Of Modelling Results Obtained Using Different Conmentioning

confidence: 99%

The influence of constitutive model selection on predicted stresses and yield in deep mine pillars – A case study at the Creighton mine, Sudbury, Canada

Walton

Diederichs

Punkkinen

2015

Geomechanics and Tunnelling

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Based on recent advances in modelling the post-yield behaviour of brittle rock, the authors have developed a calibrated inelastic model of the 7,910 level (2.4 km depth) at the Creighton Mine in Sudbury, Ontario, Canada using data collected from the monitoring of pillar dilatancy. While this calibrated model represents a state-of-the-art continuum approach for capturing the progressive development of yield and stresses in mine pillars, alternative state-of-practice approaches (elastic and perfectly plastic material models, for example) represent potentially acceptable options for practical application. The purpose of this study is to examine the influence of constitutive model choice on stress paths throughout the pillar system at the mining level of interest. The strengths and limitations of various material models are compared and contrasted. Elastic models are shown to adequately represent the larger scale pillar system behaviour from a stress transfer perspective, whereas the state-of-art brittle modelling approach is shown to be ideal for understanding specific pillar-scale stresses and yield.

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“…This may be due to the differences of the rock properties between the two mines. Notes: A1 (rock drill) and B1 (feeder) are components used in machine 1 in mine X, while A2, A3 and A4 (rock drill), B2, B3, and B4 (feeder) are components used in machines 2, 3 and 4 in mine Y Confidence log-log plot comparison between three machines used in mine Y 320 JQME 20,4 (Edelbro, 2008) while the GSI of mine X varies between 30 and 50 (Sjöberg, 2003 as cited in Edelbro, 2008). Figure 7 compares the downtime of component hoses C in four machines in different mines.…”

Section: Resultsmentioning

confidence: 99%

Downtime analysis of drilling machines and suggestions for improvements

Al-Chalabi

Lundberg

Wijaya

et al. 2014

Journal of Quality in Maintenance Engineering

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If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation.*Related content and download information correct at time of download. Purpose -The purpose of this paper is to analyse and compare the downtime of four drilling machines used in two underground mines in Sweden. The downtime of these machines was compared to show what problems affect downtime and which strategies should be applied to reduce it. Design/methodology/approach -The study collects failure data from a two-year period for four drilling machines and performs reliability analysis. It also performs downtime analysis utilising a loglog diagram with a confidence interval.Findings -There are notable differences in the downtime of most of the studied components for all machines. The hoses and feeder have relatively high downtime. Depending on their downtime, the significant components can be ranked in three groups. The downtime of the studied components is due to reliability problems. The study suggests the need to improve the reliability of critical components to reduce the downtime of drilling machines. Originality/value -The method of analysing the downtime, identifying dominant factors and the interval estimation for the downtime, has never been studied on drilling machines. The research proposed in this paper provides a general method to link downtime analysis with potential component improvement. To increase the statistical accuracy; four case studies was performed in two different mines with completely different working environment and ore properties. Using the above method showed which components need to be improved and suggestions for improvement was proposed and will be implemented accordingly.

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Numerical modelling of observed fallouts in hard rock masses using an instantaneous cohesion-softening friction-hardening model

Cited by 64 publications

References 14 publications

Influence of plastic shear strain and confinement-dependent rock dilation on rock failure and displacement near an excavation boundary

Influence of plastic shear strain and confinement-dependent rock dilation on rock failure and displacement near an excavation boundary

The influence of constitutive model selection on predicted stresses and yield in deep mine pillars – A case study at the Creighton mine, Sudbury, Canada

Downtime analysis of drilling machines and suggestions for improvements

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