The effect of transient drainage on the stress state in backfilled mine stopes.

Nawfal Mkadmi, Michel Aubertin, Li Li

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Mining and Rock Mechanics

ABSTRACT: Backfill is increasingly used in mines to ensure the stability of underground openings where ore is extracted from the rock mass. Tools to evaluate the total and effective stresses within the backfill are required to assess the mechanical response of the stopes and to optimize fill placement. This paper presents some key results from a numerical study aimed at analyzing the response of backfill after placement in a narrow vertical stope, in the presence of arching effect. Three cases are presented here, namely: simulation of dry (or drained) backfill with different stope widths, a stope backfilled with saturated fill under hydrostatic pore water pressure, and a backfilled stope with progressive drainage and consolidation. The first two cases represent the stress state when the backfill reaches equilibrium, while the results obtained in the third case illustrates how the stress distribution varies with the groundwater conditions in the stope. The influence of other factors is also discussed in the paper.

RÉSUMÉ: L remblai est en croissance constante dans les mines souterraines afin la stabilité mécanique des ouvertures où le minerai est extrait de la masse rocheuse. outils appropriés pour évaluer état des contraintes effectives et totales dans les chantiers remblayés évaluer leur réponse mécanique et pour optimiser la mise en place. Dans cet article, on présente quelques résultats numérique qui vise à analyser la réponse du remblai après sa mise en place dans un chantier minier vertical étroit . On présente ici trois cas, soit : la chantier remblayé en condition sèche (ou drainée), un chantier remblayé submergé soumis à une pression hydrostatique et un chantier remblayé avec évolution de la pression interstitielle suite au drainage et à la un état déquilibre, alors que le troisième cas illustre contraintes et de la pression es ement dans le chantier. Dsont aussi discutés dans cet article.

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Cite this article:
Nawfal Mkadmi; Michel Aubertin; Li Li (2011) The effect of transient drainage on the stress state in backfilled mine stopes. in GEO2011. Ottawa, Ontario: Canadian Geotechnical Society.

@article{GEO11Paper139,author = Nawfal Mkadmi; Michel Aubertin; Li Li ,title = The effect of transient drainage on the stress state in backfilled mine stopes.,year = 2011}