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This paper presents the findings of a consolidation test program carried out on mining tailing samples. Using a standard consolidation apparatus, along with head flow tests, it was evaluated the void ratio and permeability variations of the tailings according to the loads imposed by the raising steps into a disposal dam. Two kinds of mining materials were analyzed: gold tailings, which are more granular and do not exhibit plasticity; and bauxite tailings, that are finer and exhibit plasticity. Remolded samples were studied in both cases, as also, one undisturbed sample for the bauxite tailings, obtained through Shelby sampler. Results show the correlation between void ratio variation and permeability, against the load imposed by the raising steps at the dam, evidencing the influence of increasing loads in the reduction of permeability coefficient on the bottom layers. Our findings reveal the importance of permeability variation during the life-cycle of tailing deposits, which should be considered in the development of safer designs.
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