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ON THE STABILITY OF EXPOSED BACKFILL IN MINE STOPES
Session: Rock Mechanics and Engineering Geology III / Mécanique des roches et génie géologique III
Nooshin Falaknaz, BGC Engineering Inc. (Canada)
Michel Aubertin, Département des génies civil, géologique et des mines, Ecole polytechnique Montreal (Canada)
Li Li, Département des génies civil, géologique et des mines, Ecole polytechnique Montreal (Canada)
Backfilling of mine stopes for ground control around large openings provides a safe work place. The exposed face in the cemented backfill pillars is required to remain stable during removal of one of the support walls to create the adjacent stope. The minimum strength of the backfill is a critical issue to avoid safety problems and save the operational costs. A few studies have been conducted to assess the required strength of backfill in stopes with an open face. This paper presents 3D numerical simulations results to investigate the response of exposed backfill during sequential excavation, considering the effect of stope geometry and material strength. Numerical modelling results are then compared with analytical solutions to obtain the required backfill strength
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