Chemical-Physical Characterization of Stava Tailings Subjected to an Innovative Aging Technique

Bella, Gianluca Di; Barbero, Monica; Lameiras, Fernando Soares; Espósito, Terezinha; Barpi, Fabrizio

doi:10.11159/icgre22.229

Cited by 3 publications

(2 citation statements)

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“…The liquid limit is wL=27.4%, the plastic limit was evaluated wP=18.0% and the plasticity index was PI=9.4 ([13]- [14]), with a specific gravity equal GS=2.828 and hydraulic conductivity k=10 -7 m/s. Xray diffraction analysis allowed to show a significant amount of calcite and fluorite ([15]- [16]). The static liquefaction response was investigated by means of monotonic triaxial tests carried out on samples 38 mm initial diameter and 76 mm initial height.…”

Section: Testing Materials and Experimental Apparatusmentioning

confidence: 99%

Mechanical Response of Tailings under Monotonic Triaxial Tests in Unsaturated and Nearly Saturated Conditions

Bella¹

2023

World Congress on Civil, Structural, and Environmental Engineering

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A detailed knowledge of the mechanical behaviour of unsaturated tailing wastes is a key element to assess the stability analysis of tailing facilities, considering the variation of the soil strength due to climate effects, rainfall, or poor management in order to minimize the high rate of recent failures associated with unacceptable fatalities, economic and environmental damages. This research investigates the mechanical behaviour of unsaturated fluorite ore wastes collected after the failure of the Stava tailing dams (Italy). The static liquefaction response of the tailings was studied by carrying out CIU triaxial tests by through application of different backpressures to obtain unsaturated or nearly saturated specimens. The influence of the degree of saturation on the mechanical response of Stava tailings is investigated and the static liquefaction strength evaluated. Outcomes are interpreted based on the Water Retention Curve estimated by performing water retention tests on the same soil, and within the Critical State framework. Results are also compared with those obtained in fully saturated conditions from a previous experimental campaign.

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Section: Testing Materials and Experimental Apparatusmentioning

confidence: 99%

Mechanical Response of Tailings under Monotonic Triaxial Tests in Unsaturated and Nearly Saturated Conditions

Bella¹

2023

World Congress on Civil, Structural, and Environmental Engineering

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“…Furthermore, tailing basins are subjected to many external actions and phenomena affecting their operation, i.e., surface runoff, infiltration and consolidation process, capillary rise or chemical reactions that generate additional products, such as acids, that can more easily leach into waterways. Failures of such structures can have deleterious consequences on the environmental, society and even impact areas miles away far from the collapsed dam ([3]- [4]- [5]- [6]- [7]) as proved from the high rate of recent collapses in several countries (Fig. 2a).…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Tailing Dams Stability: a Preliminary, Parametric Analysis of some Key Factors

Bella¹,

Freire²,

Lameiras³

et al. 2023

World Congress on Civil, Structural, and Environmental Engineering

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Tailing wastes are by-products of mining industry and are generally mixtures of rock, sand, fine-grained solid material and in some cases relevant quantities of heavy metals and water remaining after the mineral values have been extracted from the patent ore. In recent years the amount of tailings has significantly increased to meet the growing demand for metals and minerals. Huge amounts of tailing wastes are produced and discharged inside storage facilities (TSF), also known as tailing dams. Owing to their complexity and high rate of collapses with relevant loss of human lives, economic and environmental damages, a detailed knowledge of the hydromechanical properties of tailings is essential to develop a reliable stability analysis both for new and existing structures. This research provides a preliminary parametric study aimed at investigating the impact of some fundamental design aspects. The influence of the adopted numerical method, raising techniques, distance of decant pond, hydraulic conditions, geometry of drainage systems and uncertainty of geotechnical properties on stability of an embankment have been evaluated for a simple case, providing some fundamental concepts to be considered when designing new tailing dams or performing stability analysis on existing ones.

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An Insight into the Hydraulic Response of Unsaturated Sand-Silt Mixtures of Stava Tailings

Bella¹

2022

IJCI

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Chemical-Physical Characterization of Stava Tailings Subjected to an Innovative Aging Technique

Cited by 3 publications

References 0 publications

Mechanical Response of Tailings under Monotonic Triaxial Tests in Unsaturated and Nearly Saturated Conditions

Mechanical Response of Tailings under Monotonic Triaxial Tests in Unsaturated and Nearly Saturated Conditions

Numerical Investigation on Tailing Dams Stability: a Preliminary, Parametric Analysis of some Key Factors

An Insight into the Hydraulic Response of Unsaturated Sand-Silt Mixtures of Stava Tailings

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