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Stress ratios in entire mine stopes with cohesionless backfill: A numerical study

Pengyu Yang, Li Li, Michel Aubertin

Article (2017)

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Abstract

Evaluation of stress states in backfilled mine stopes (or similar openings), using archingtheory, can be largely impacted by the value selected for the earth pressure coefficient, K = σ′h/σ′v.Recently, the current study's authors addressed the debate about the value of K near the openingcenter, based on Rankine's active coefficient (Ka) and at-rest coefficient (K0). Here, stress ratios invertical backfilled stopes are numerically assessed (in two dimension, 2D), considering both theindependent and related backfill internal friction angle (φ′) and Poisson's ratio (ν). Emphasis is placedon the backfill state near stope walls, where local rotation of stresses occurs, so the coefficient (K)and principal stress ratio, Kps (= σ′3/σ′1), should be distinguished. Parametric analyses indicate thatvalues of K and Kps depend on the position and the relationship between φ′ and ν. Near the openingcenter, K (= Kps) is close to Ka when ν or φ′ is below a critical value; otherwise the value approachesK0, defined from ν. Near both walls, Kps is always close to Ka, while K is near K0 for related ν − φ′cases and depends on their respective values for independent ν and φ′. Additional simulationsconducted with interface elements indicate that the stress ratios near the opening center line areinsensitive to interface roughness and are almost identical to values obtained without interfaces, butthe stress ratios near walls may change for less rough or smooth interfaces.

Uncontrolled Keywords

mine stopes; backfilled openings; earth pressure coefficient; principal stress ratio; FLAC

Subjects: 1400 Mining and mineral processing > 1401 Mining engineering
1400 Mining and mineral processing > 1403 Rock mechanics
2950 Applied mathematics > 2955 Numerical analysis
Department: Department of Civil, Geological and Mining Engineering
Research Center: RIME - Research Institute on Mines and the Environment UQAT-Polytechnique
Funders: CRSNG / NSERC, Institut de recherche Robert-Sauvé en santé et en sécurité du travail, Fonds de recherche du Québec—Nature et Technologies, Research Institute on Mines and Environment (RIME UQAT-Polytechnique)
Grant number: 402318, 2013-0029, 2015-MI-191676
PolyPublie URL: https://publications.polymtl.ca/3600/
Journal Title: Minerals (vol. 7, no. 10)
Publisher: MDPI
DOI: 10.3390/min7100201
Official URL: https://doi.org/10.3390/min7100201
Date Deposited: 24 Mar 2022 10:30
Last Modified: 11 Nov 2022 14:09
Cite in APA 7: Yang, P., Li, L., & Aubertin, M. (2017). Stress ratios in entire mine stopes with cohesionless backfill: A numerical study. Minerals, 7(10). https://doi.org/10.3390/min7100201

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