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Summary: AN IMPROVED SOLUTION TO ESTIMATE THE
STRESS STATE IN SUB-VERTICAL BACKFILLED
STOPES
Li Li and Michel Aubertin
Department of Civil, Geological and Mining Engineering École Polytechnique,
Montreal, Quebec, Canada
ABSTRACT
The increasing use of backfill in underground mines requires a better understanding of the interaction between the
relatively soft fill material and the surrounding rock mass. In recent years, it has been shown that stresses in backfilled
stopes can be estimated using an approach based on Marston's arching formulation developed initially for buried
conduits in trenches. However, despite its advantages, this approach has some shortcomings. For instance, it
postulates that both the vertical and horizontal stresses are uniformly distributed across the opening width. Numerical
investigations conducted by the authors have shown that this assumption is not always valid. This paper presents a
modification to the Marston-based solution, which leads to a non-uniform vertical stress distribution across the opening.
This modification of the analytical solution involves parameters that have been calibrated against some numerical
modelling results obtained with FLAC-2D.
RÉSUMÉ
L'accroissement de l'utilisation des remblais dans les mines souterraines requiert une meilleure compréhension de
l'interaction entre le matériau de remblayage, relativement déformable, et le massif rocheux encaissant. Au cours des
dernières années, il a été démontré que les contraintes dans les chantiers remblayés peuvent être estimées en utilisant
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