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The effects of in situ stress uncertainties on the assessment of open stope stability: Case study at the Niobec Mine, Quebec (Canada)

Saeidi Ali, Heidarzadeh Shahriyar, Lalancette Sandra et Rouleau Alain. (2021). The effects of in situ stress uncertainties on the assessment of open stope stability: Case study at the Niobec Mine, Quebec (Canada). Geomechanics for Energy and the Environment, 25, e100194.

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URL officielle: http://dx.doi.org/doi:10.1016/j.gete.2020.100194

Résumé

In deep underground mines, a successful development plan to exploit deeper mining levels is highly dependent on adequate consideration of the magnitude and orientation of situ stress state. However, significant uncertainties are associated with the estimation of these parameters. The in-situ stress values that are used in the evaluation of the stability of underground structures in each mine strongly depends on the results of measurement of the stresses as function of the mine depth and the methodology used for the interpretation of the data as well as engineering judgment. These interpretations could produce several scenarios for estimating the stresses in a mine. Each scenario could yield different stability assessment results some of which were not normally used in the current mine stability study. Three different scenarios for estimating stress at the Niobec underground mine (Quebec, Canada) were determined based on the data available from previous stress measurement campaigns. Numerical modeling (FLAC3D) was used to evaluate the potential of brittle, tensile and compressive failure for the vertical transverse and rib pillars. The results demonstrate that in spite of the development of extensive brittle and tensile damage zones within the rock mass, no major brittle or tensile failure is expected to occur at the considered mining levels based on all three stress scenarios. Moreover, meaningful differences in the stability analysis results between the three stress scenarios highlight the importance of appropriate selection of stress estimation approaches in planning deeper mine levels.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:25
Pages:e100194
Version évaluée par les pairs:Oui
Date:Mars 2021
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Sciences appliquées
Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Unité d'enseignement en sciences de la Terre
Unités de recherche > Chaire de recherche du Canada en prévision et prévention des risques liés aux aléas hydro-géotechniques (P2GeoRISQUE)
Mots-clés:numerical modeling, stress field heterogeneity, in-situ stress estimation, uncertainty, tensile failure, brittle shear ratio, Niobec Mine, modélisation numérique, hétérogénéité des champs de contraintes, estimation des contraintes in-situ, incertitude, rupture en traction, ratio de cisaillement fragile, mine Niobec
Déposé le:17 nov. 2021 21:21
Dernière modification:17 nov. 2021 21:21
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