Unsaturated Flow in Hydrating Porous Media: Application to Cemented Paste Backfill

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  • Sustainability of hardrock mining is contingent upon delivering a high quality cemented paste backfill (CPB) that is self-sustaining during ore recovery. The integrity of CPB systems hinges on how quickly in excess pore-water pressures (PWPs) dissipates. Consolidation and self-desiccation are critical factors that determine how rapid PWPs expel in hydrating CPB.Current models characterize stress distributions in CPB based on fully saturated / undrained conditions. Recent studies suggest that such conditions are not entirely valid. This research therefore, describes PWP behaviour in CPB by using an unsaturated flow theory framework that takes into account self-desiccation.The analyses involved capturing the experimental lower and upper bound water-retention properties of CPB. These properties are then used to solve a modified 1-D unsaturated flow equation of hydrating CPB material. Numerical predictions of PWPs in a column test were well simulated when comparing these results with the experimental measurements.

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  • Copyright © 2013 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
Date Created
  • 2013


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