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

Mohamed Amine Sobhi and Li Li

Article (2017)

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Abstract

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.

Uncontrolled Keywords

Mine depth ; Backfill ; Sill mat ; Stresses ; Numerical modeling

Subjects: 1400 Mining and mineral processing > 1401 Mining engineering
Department: Department of Civil, Geological and Mining Engineering
Research Center: RIME - Research Institute on Mines and the Environment UQAT-Polytechnique
Funders: Natural Sciences and 315 Engineering Research Council of Canada (NSERC), Institut de recherche Robert-Sauvé en santé et en sécurité du travail, Fonds de Recherche du Québec – Nature et Technologies (FRQNT), Research Institute on Mines and Environment (RIME UQAT-Polytechnique)
Grant number: 402318, 2013-0029, RQNT 2015-MI-19167
PolyPublie URL: https://publications.polymtl.ca/5141/
Journal Title: Journal of Rock Mechanics and Geotechnical Engineering (vol. 9, no. 3)
Publisher: Elsevier
DOI: 10.1016/j.jrmge.2017.01.001
Official URL: https://doi.org/10.1016/j.jrmge.2017.01.001
Date Deposited: 24 Feb 2023 15:09
Last Modified: 01 Jun 2023 16:53
Cite in APA 7: Sobhi, M. A., & 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

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