Numerical investigation of the stresses in backfilled stopes overlying a sill mat

Auteurs

Mohamed Amine Sobhi, Research Institute on Mines and the Environment, Department of Civil, Geological and Mining Engineering, École Polytechnique de Montréal, Montréal, Canada
Li Li, Research Institute on Mines and the Environment, Department of Civil, Geological and Mining Engineering, École Polytechnique de Montréal, Montréal, Canada

Type de document

Études primaires

Année de publication

2017

Langue

Anglais

Titre de la revue

Journal of Rock Mechanics and Geotechnical Engineering

Première page

490

Dernière page

501

Résumé

Backfill is commonly used in underground mines to help increase the ore recovery rate and reduce the ore dilution. The use of a part of mine waste as underground backfill material also helps reduce the environmental impact of mining operations. After all, backfill is used to provide a working platform or safer working space. Its primary and most important role is to improve the rock mass stability around mine openings. However, most available solutions to stress analyses were developed for an isolated stope, without taking into account the influence of mine depth, or of adjacent stopes. In this paper, results from a numerical study carried out to evaluate the stresses in backfilled stopes overlying a sill mat are presented. Mine depth and excavation of the underlying stope below the sill mat (horizontal pillar) are both taken into consideration. The influence of stope geometry, backfill, sill mat and rock properties on the stresses is also evaluated. Compared with the case of a single isolated backfilled stope, the numerical results show that the stress magnitudes in the overlying backfill are considerably increased due to the excavation of the underlying stope. In general, the stresses also increase with mine depth and backfill stiffness, while these tend to decrease with an increase in the surrounding rock mass stiffness. These results suggest that existing solutions for backfill design may need to be revised. © 2017 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences

Mots-clés

Exploitation avec remblayage, Stowing and filling, Concentration de tensions, Stress concentration, Formation de voûtes, Arching

Numéro de projet IRSST

2013-0029

Citation recommandée

Sobhi, M. A. et Li, L. (2017). Numerical investigation of the stresses in backfilled stopes overlying a sill mat. Journal of Rock Mechanics and Geotechnical Engineering, 9(3), 490-501. https://doi.org/10.1016/j.jrmge.2017.01.001