Stability of Tailings Beach Slopes

Barrera, Sergio; Riveros, Cecilia Del Carmen Luna

doi:10.36487/acg_repo/663_15

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…Hypothesis A has been suggested by Barrera and Riveros (2006). It has also been explicitly outlined by Fitton and Seddon (2013), who state that following incremental deposition and settling on a thickened tailings deposit "there is a thin layer of tailings on the beach, at a density that is independent of the concentration of the slurry it was deposited from.…”

Section: Introductionmentioning

confidence: 96%

The influence of slurry density on in situ density

Reid¹,

Fourie²

2015

Proceedings of the 18th International Seminar on Paste and Thickened Tailings

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Since the beginning of the Paste and Thickened Tailings seminar series, there has been ongoing discussion as to whether an increase in the deposited (initial) slurry density will result in an increased density at depth within an accreting deposit, all else being equal. Despite frequent speculation and theorising, there has been relatively little laboratory data or other evidence presented at the conference series to address this question. To address the above deficiency, a literature review was undertaken to identify experimental programs where the same material was prepared for soil testing from different initial slurry densities. Twelve such studies were identified, of which nine indicate that an increase in initial slurry density resulted in increased density at subsequent significant vertical effective stresses. Case studies presented on three tailings deposits are investigated, to assess the implications of the presented results on the potential for initial slurry density to influence in situ density. For many of the studies reviewed, there appears to be an indication that an increased initial slurry density resulted in an increased in situ density at significant vertical effective stresses. Finally, a series of consolidation tests were undertaken by the authors, wherein four tailings types were prepared from different non-segregating initial slurry densities. For three of these materials, a dependence on situ density was observed, based on changes to initial slurry density. On the basis of the review and experimental data presented in this study, the authors conclude that for at least some materials, initial slurry density can result in an increased density across a wide range of vertical effective stresses.

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Section: Introductionmentioning

confidence: 96%

The influence of slurry density on in situ density

Reid¹,

Fourie²

2015

Proceedings of the 18th International Seminar on Paste and Thickened Tailings

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“…In the literature, there is paucity of research on the stability of non-segregated tailings stacks. Previous studies show that the stability of thickened tailings stacks is most critical when tailings liquefy under seismic conditions (Poulos et al, 1985;McMahon et al, 1996;Seddon et al, 1999;Fourie, 2006;Barrera and Riveros, 2006;Seddon, 2007) and efforts were made to predict the safety margins. However, the stability of tailings stacks under both shortterm and long-term conditions has not been fully addressed.…”

Section: Figure 1 Variation Of Tailings Depositional Slope With Taili...mentioning

confidence: 99%

Stability of Large Thickened, Non-Segregated Tailings Slopes

Li¹,

Been²,

Ritchie³

et al. 2009

Proceedings of the Twelfth International Seminar on Paste and Thickened Tailings

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The growing trends in tailings management are to eliminate ponded water on top of tailings and to thicken tailings to conserve water and minimise the amount of water that has to be managed. There are various degrees of thickening ranging from a high density, non-segregated slurry, to a paste and filtered tailings.Thickened tailings, with a consistency of a high density, non-segregated slurry or a paste can be safely deposited at slopes between 2-10% in thin layers that allow for desiccation with relatively small containment dams at the toe. However, stability is a concern, especially for large tailings deposits because the deposited properties can not accurately be predicted beforehand. Empirical relationships have not been developed because there is insufficient field data. This paper discusses the stability of thickened tailings stacks (slopes) in both the short-term during operation and long-term in the closure mode. The authors have developed an innovative design methodology based on critical state soil mechanics fundamentals that can predict the stability of thickened tailings slopes and the change in the factor of safety with time. This tool can also be used to carry out sensitivity analyses for different operational conditions and different tailings properties so that deposition strategies can be optimised. Thin layer deposition and desiccation are necessary to ensure the stability of these slopes. A feature of the method is that the deviations from the design assumptions are evident shortly after deposition commences allowing time to implement changes.

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“…The perception that liquefaction could cause the tailings within a TSF to have zero residual strength, effectively acting as a heavy liquid and coming to rest at a horizontal slope is one that is common, as mentioned by Barrera (2005). As a consequence, in Chile the legislation does not allow a TSF that has an elevation that is internally higher than the perimeter confining embankment.…”

Section: Concerns Regarding Potential For Liquefaction Ofmentioning

confidence: 99%

Liquefaction Potential of Surface Deposits of High-Density Thickened Tailings

Fourie¹

2006

Proceedings of the Ninth International Seminar on Paste and Thickened Tailings

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Stability of Tailings Beach Slopes

Cited by 3 publications

References 5 publications

The influence of slurry density on in situ density

The influence of slurry density on in situ density

Stability of Large Thickened, Non-Segregated Tailings Slopes

Liquefaction Potential of Surface Deposits of High-Density Thickened Tailings

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