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NUMERICAL SIMULATIONS TO ASSESS THE STRESS STATE IN BACKFILLED STOPES WITH INCLINED WALLS
Session: Mining Geotechnique II / Géotechnique minière II
Abtin Jahanbakhshzadeh, École Polytechnique de Montréal (Canada)
Michel Aubertin, École Polytechnique de Montréal (Canada)
Li Li, École Polytechnique de Montréal (Canada)
Adding backfill in mine stopes improves ground stability and reduces the volume of solid wastes disposed on the surface. To ensure the safe use of backfill, practical tools are required to assess the stress state in the stopes and on support structures. Previous work has shown that these stresses are influenced by an arching effect related to the stress transfer between the soft fill and stiff rock mass. However, in inclined stopes, the shear stresses developing along the walls are not the same on each side of the opening, so the arching effect is typically less well developed than in vertical stopes. In this article, 2D and 3D numerical simulations results are presented to illustrate the interaction between the backfill and rock mass in stopes with inclined walls. The influence of strength parameters of the backfill and of stope geometry is examined and discussed.
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