Influence of Water Pressure on the Stress State in Stopes with Cohesionless Backfill |
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Authors: | Li Li Michel Aubertin |
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Institution: | (1) Department of Civil, Geological and Mining Engineering, école Polytechnique de Montréal, Succursale Centre-ville, C.P. 6079, Montreal, QC, Canada, H3C 3A7;(2) Industrial NSERC Polytechnique-UQAT Chair on Environment and Mine Wastes Management, Montreal, QC, Canada |
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Abstract: | The rapid increase of backfill use in underground mines requires a better understanding of the interaction between the fill
material and the surrounding rock mass. This is a fairly complex issue as backfill materials are weak compared to the rock
mass. This difference in the mechanical behavior induces a stress transfer along the contact area. Previous work conducted
on backfilled trenches and mining stopes has shown that basic arching theory can be used to estimate earth pressures in narrow,
vertical openings. In this regard, most existing solutions have been developed for dry backfills. However, in many cases,
water is present in mine stopes, so its effect should be assessed. In this paper, the authors present a solution to evaluate
the stress state in submerged or partially submerged backfilled stopes. The proposed analytical solution is validated against
numerical modeling results. |
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Keywords: | Arching effect Analytical solutions Hydraulic fill Effective stresses Pore pressure |
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