A laboratory investigation of the dynamic properties of tailings

JamesMichael,; AubertinMichel,; WijewickremeDharma,; Ward, WilsonG.

doi:10.1139/t11-060

Cited by 78 publications

(22 citation statements)

References 33 publications

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“…Additionally, Thevanayagam and Martin (2001) and Hyde et al (2007) showed that the pre-and post-liquefaction consolidation curves of loose silts are parallel to each other in the e-p' plane (i.e. James, 2009;James et al 2011). Other testing results also showed that low plasticity tailings from hard rock mines behave as sandy soils in many ways (e.g.…”

Section: Page 8 Of 40mentioning

confidence: 99%

Numerical simulations of seismic and post-seismic behavior of tailings

2016

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Several tailings impoundments have failed as a result of earthquakes in the last few decades. A majority of these failures were due to direct seismic loading, tailings liquefaction during shaking, or the post-seismic behavior of the tailings as it relates to the dissipation of excess pore water pressures that were generated during shaking. Previous work has indicated that the UBCSAND model (Byrne et al. 1995) is capable of simulating the cyclic simple shear testing response of low plasticity tailings over a range of consolidation stresses and cyclic shear ratios. However, the ability of the model to simulate the dynamic and subsequent behavior of such tailings for other conditions, such those induced by shakings table tests, has not yet been evaluated. In this regard, previous work has shown that the main components of the UBCSAND model cannot realistically simulate some specific responses, including the post-seismic volumetric strains related to excess pore water pressure dissipation. This paper presents numerical modeling results of the dynamic behavior of tailings from hard rock mines. It introduces a method for simulating their postseismic behavior by including an updating scheme for the elastic moduli into the UBCSAND model. The results of cyclic simple shear testing, seismic table testing and complementary experimental relationships were used to calibrate and validate the model with its new component.The simulated response of tailings during cyclic simple shear testing and for a complete seismic table test shows that the proposed approach simulates the experimental observations well. Level ground, seismically-induced liquefaction and post-seismic behavior of a 15-m-thick tailings deposit are also simulated, leading to post-liquefaction settlements that are in agreement with empirical relationships. résidus d'une épaisseur de 15 m soumis à un séisme mène à des tassements post-liquéfaction qui montrent une bonne corrélation avec ceux obtenus de relations empiriques.

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Section: Page 8 Of 40mentioning

confidence: 99%

Numerical simulations of seismic and post-seismic behavior of tailings

2016

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“…In some cases (especially in the early stages of a project), the UCS values can be used to estimate the required strength from eq. [7], by postulating that f ≅ 35°(as typically obtained on tailings from hard rock mines under low normal stresses; e.g., James et al 2011).…”

Section: Discussionmentioning

confidence: 99%

A modified solution to assess the required strength of exposed backfill in mine stopes

Aubertin

2012

Can. Geotech. J.

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Backfilling contributes to the improvement of ground stability and reduction of ore dilution in underground mines. A critical issue for backfilled stope design is the required strength for the fill material. A practical solution to address this question was proposed by Mitchell and co-workers for stopes with an exposed face and a high aspect ratio (height H over width B). However, this solution is not directly applicable to stopes with a relatively low aspect ratio (H/B). Its application is also restricted by additional limitations on the strength along the fill-rock interfaces and the load applied on top of the backfill. In this note, the model proposed by Mitchell and co-workers is modified to provide an estimate of the required strength of backfill for various geometries, material properties, and surface loads. The modified Mitchell (MM) solution is validated against experimental results. Sample calculations with the MM solution are also presented and discussed.Résumé : Le remblayage contribue à l'amélioration de la stabilité du massif rocheux et au contrôle de la dilution du minerai dans les mines souterraines. Lors de la conception des chantiers remblayés, un aspect critique est la détermination de la ré-sistance requise pour le remblai. Une solution pratique pour répondre à cette question a été proposée par Mitchell et collaborateurs pour des chantiers avec une face exposée et un rapport hauteur sur largeur élevé. Cette solution n'est toutefois pas directement applicable aux chantiers relativement bas et larges (faible rapport hauteur sur largeur). D'autres restrictions limitent l'application de la solution, selon la valeur de la résistance le long des interfaces remblai-roches et la charge appliquée à la surface du remblai. Dans cette note, le modèle de Mitchell et collaborateurs est modifié pour fournir une estimation de la résistance du remblai pour diverses géométries, propriétés de matériaux et charges de surface. La solution de Mitchell modifiée (MM) est validée à partir de résultats expérimentaux. Quelques exemples de calculs avec la solution MM sont aussi présentés et discutés.

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“…Tests under reductive conditions were carried out in 80 mL glass vials filled with 64 mL of artificial mine tailing containing MCNPs and sealed with Teflon-lined caps. Additionally, we have also performed adsorption isotherm measurements using different concentrations of Cu (2,4,6,8,10,15,20,50, 100 and 200 mg/L) and 9 mL of MCNPs. The amount of Cu 2+ adsorbed per unit mass of wet nanoparticles was calculated through the Equation 1:…”

Section: Removal Of Heavy Metalsmentioning

confidence: 99%

“…Actually, the delivery of hazardous contaminants to the ecosystem, especially heavy metals into the water streams is a great concern (EPA, 2012). Chemical characterization of mine tailings has found the presence of heavy metals such as Hg 2+ , As 5+ , Pb 2+ , Cu 2+ , Zn 2+ , Ag + , Ni 2+ , Mn 2+ , and others [4]. Due to the recognized toxicity of heavy metals, the exposure to these elements, even in trace concentrations, is considered to be harmful to living beings [5,6].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Multicomponent Nanoparticles for Immobilization of Heavy Metals in Aqueous Phase

Flores

Debut

Stael³

2016

NanoWorld J

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This study is focused on the preparation of multicomponent nanoparticles (MCNPs) used to remediate artificial and real mine tailings. The nanoparticles were synthesized with 0.035 M or 0.007 M of sodium sulfate, 0.5 M of iron chloride and 0.8 M of sodium borohydride. Characterization of nanoparticles performed with a Transmission Electron Microscope (TEM), X-ray diffractometer (XRD), Fourier Transform Infrared Spectrometer (FTIR), and X-ray Photoelectron Spectrometer (XPS) demonstrated, these materials are in the nanoscale range, contain zero valent iron Fe(0) and iron sulfide (FeS) and are structurally modified after treatment. Simultaneous removal of heavy metals was carried out under oxidizing and reducing conditions using MCNPs reaching an efficiency of more than 98% for all of them. Kinetics conducted under oxidizing condition, pH 3 and 0.035 M sodium sulfate shows that the highest removal of heavy metals from artificial mine tailings was achieved after 160 min of treatment although steady state was reached in 240 mins. Results of kinetic tests fit very well to a pseudo-second-order model, while the isothermal equilibrium adsorption tests were adjusted to a Freundlich isotherm. Also, nanoparticles showed a high adsorption capacity (~140 mg/g) when they were in contact with 200 mg Cu 2+ /L. Finally, multicomponent nanoparticles tested with real mine tailings in the presence of other competing chemicals results in heavy metals removal over 90%.

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A laboratory investigation of the dynamic properties of tailings

Cited by 78 publications

References 33 publications

Numerical simulations of seismic and post-seismic behavior of tailings

Numerical simulations of seismic and post-seismic behavior of tailings

A modified solution to assess the required strength of exposed backfill in mine stopes

Synthesis of Multicomponent Nanoparticles for Immobilization of Heavy Metals in Aqueous Phase

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