A numerical modelling study to assess the stress distribution in two nearby backfilled openings created in sequence

N. Falaknaz, M. Aubertin, L. Li

In the proceedings of: GeoRegina 2014: 67th Canadian Geotechnical Conference

Session: Mining Geotechnics

ABSTRACT: Backfilling of underground mine stopes is used to provide a safe work place. The interaction between the backfill and surrounding rock mass has to be evaluated for a secure application. The stress distribution in backfilled stopes is influenced by various factors including the excavation of adjacent openings. Recent simulations results have shown some of the complex interactions that can develop between the backfill and rock mass in the case of neighboring stopes. In this article, the authors present additional numerical simulation results to illustrate the response of two nearby stopes created and backfilled in sequence, considering the influence of other factors, i.e. pillar width, properties of the backfill and rock mass, and natural stress state. Key results, shown in terms of the stresses and strains in the backfill and displacements of the rock walls, are analyzed and discussed.

RÉSUMÉ: Le remblayage des chantiers miniers souterrains permet de créer un espace de travail remblai et le massif rocheux doit être évalué pour une application sûre. La distribution des contraintes dans les chantiers remblayés est influencée simulations numériques récentes ont illustré certaines des interactions complexes qui peuvent se développer entre le remblai et le massif dans le cas de chantiers voisins. Dans cet article, les auteurs montrent des résultats de simulations additionnelles sur la réponse présente ici les résultats en termes des contraintes et des déformations dans le remblai et des déplacements aux parois, avec une analyse et une discussion.

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