| Issue |
E3S Web of Conf.
Volume 544, 2024
8th International Symposium on Deformation Characteristics of Geomaterials (IS-Porto 2023)
|
|
|---|---|---|
| Article Number | 14005 | |
| Number of page(s) | 6 | |
| Section | Behaviour, Characterization and Modelling of Various Geomaterials and Interfaces - Sensitive and Liquefiable Soils: Tailings and Other Highly Brittle Strain-Softening Soils | |
| DOI | https://doi.org/10.1051/e3sconf/202454414005 | |
| Published online | 02 July 2024 | |
Influence of initial compaction and confining pressure on the hydraulic conductivity of compacted iron ore tailings
1 Graduate Program in Geotechnics, University of Brasilia, 70910-900, Brazil
2 Department of Civil Engineering, Federal University of Vicosa, 36570-900, Brazil
3 Exploration and Mineral Projects, Mineral Development Centre, VALE S.A. 33040-900, Brazil
4 Construct-Geo, Faculty of Engineering, University of Porto, 4200-465, Portugal
* Corresponding author: santosr@ufv.br
The hydraulic conductivity of iron tailings is an important factor affecting the stability of tailings storage facilities. Stacking compacted filtered ore tailings is a promising alternative for safer tailings disposal. These tailings storage facilities’ internal drainage systems must be designed appropriately to avoid excessive seepage pressure, saturation, and slope failure. In this context, the factors that affect hydraulic conductivity must be adequately evaluated. Therefore, the hydraulic conductivity behavior of compacted iron ore tailings still needs to be investigated. In addition, the effect of high confining pressure on hydraulic conductivity needs to be evaluated. This study investigates the impact of the initial compaction and the confining pressure on hydraulic conductivity. For this, the flexible wall permeameter tests were carried out on filtered ore tailings compacted in three degrees of compaction: 77, 94, and 101% of optimum dry density as determined by the standard Proctor method. These specimens were saturated and then consolidated with different confining pressure. It is possible to affirm that the increased confining pressure decreases the hydraulic conductivity. The hydraulic conductivity decreases by less than one order of magnitude, regardless of the initial compaction. Moreover, the data suggest that hydraulic conductivity’s decay rate depends on initial compaction—the hydraulic conductivity of the loose specimen decays at a greater rate than that of the dense specimens. However, the reductions of the void ratio under the confining pressure of 1600 kPa and 2200 kPa were not enough to decrease the hydraulic conductivity. Thus, under high-stress confining, the hydraulic conductivity becomes practically constant.
Key words: Iron ore tailings hydraulic behavior / Dry stack tailings / Compaction / Transitional behavior in tailings
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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