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

Pengyu Yang, Li Li and Michel Aubertin

Article (2017)

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Cite this document: Yang, P., Li, L. & Aubertin, M. (2017). Stress ratios in entire mine stopes with cohesionless backfill: A numerical study. Minerals, 7(10). doi:10.3390/min7100201
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Abstract

Evaluation of stress states in backfilled mine stopes (or similar openings), using arching theory, 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 opening center, based on Rankine’s active coefficient (Ka) and at-rest coefficient (K0). Here, stress ratios in vertical backfilled stopes are numerically assessed (in two dimension, 2D), considering both the independent and related backfill internal friction angle (φ′) and Poisson’s ratio (ν). Emphasis is placed on 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 that values of K and Kps depend on the position and the relationship between φ′ and ν. Near the opening center, K (= Kps) is close to Ka when ν or φ′ is below a critical value; otherwise the value approaches K0, 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 simulations conducted with interface elements indicate that the stress ratios near the opening center line are insensitive to interface roughness and are almost identical to values obtained without interfaces, but the 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

Open Access document in PolyPublie
Subjects: 1400 Génie minier et minéral > 1401 Génie minier
1400 Génie minier et minéral > 1403 Mécanique des roches
2950 Mathématiques appliquées > 2955 Analyse numérique
Department: Département des génies civil, géologique et des mines
Research Center: IRME - Institut de recherche en mines et environnement 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
Date Deposited: 24 Mar 2022 10:30
Last Modified: 25 Mar 2022 01:20
PolyPublie URL: https://publications.polymtl.ca/3600/
Document issued by the official publisher
Journal Title: Minerals (vol. 7, no. 10)
Publisher: MDPI
Official URL: https://doi.org/10.3390/min7100201

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