The validity of laboratory flume data for predicting beach slopes of thickened tailings deposits

Fourie, Andries; Gawu, S.K.Y.

doi:10.36487/acg_rep/1063_21_fourie

Cited by 10 publications

(9 citation statements)

References 5 publications

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“…Henriquez and Simms (2009) verified the applicability of lubrication theory to describe thickened tailings flows for gold tailings in the laboratory, and observed the scale-dependency of the overall deposition angle of a single layer deposits. Fourie and Gawu (2010) applied equations derived from a geotechnical perspective and also noted the same scale dependency. Fourie and Gawu (2010) also investigated errors induced by sidewall friction in flume tests.…”

Section: Beaching Angles and Evolution Of Stack Geometry For Thickenementioning

confidence: 84%

Beaching angles and evolution of stack geomoetry for thickened tailings - a review

Simms¹,

Williams²,

Fitton³

et al. 2011

Proceedings of the 14th International Seminar on Paste and Thickened Tailings

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The reliable prediction or management of beach slope and stack geometry is integral to realisation of the potential benefits of thickened tailings technology. Stack geometry not only controls the storage capacity for a given footprint, but also strongly influences post-deposition geotechnical and geoenvironmental performance. Unfortunately, accurate prediction in design has proved difficult. However, there has been significant improvement in understanding the behaviour of tailings after they exit the pipe, and a number of methods for beach slope prediction have been proposed and developed. This paper reviews a selection of these methods, and examines their applicability to different deposition scenarios. Some recommendations are made to assist engineers and operators to achieve a given stack geometry.

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Section: Beaching Angles and Evolution Of Stack Geometry For Thickenementioning

confidence: 84%

Beaching angles and evolution of stack geomoetry for thickened tailings - a review

Simms¹,

Williams²,

Fitton³

et al. 2011

Proceedings of the 14th International Seminar on Paste and Thickened Tailings

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“…Upon evaluation of the construction of parameter N and the associated restriction of having real solutions only if ( − 1) > 0, it is possible to think that this is achieved when N = 1. The approach of a limiting condition for beach slope estimation purposes has been recognised by different authors, such as McPhail (1995McPhail ( , 2008 using entropy maximisation criteria, Fitton (2007) and Pirouz and Williams (2007) using critical settling velocity criteria, or Li (2011) and Fourie and Gawu (2010) using limit equilibrium criteria.…”

Section: Definition Of a Limit Condition Criteria For Beach Slopes Anmentioning

confidence: 99%

Tailings beach slopes as a dimensionless parameter of non-Newtonian flows

Errázuriz¹

2018

Proceedings of the 21st International Seminar on Paste and Thickened Tailings

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The application of highly thickened tailings technologies is rapidly increasing due to the perceived benefits with respect to reduction of environmental impacts, water saving and potential reductions in dam size and impoundment footprint. Evaluation of these potential benefits requires that during design stages an understanding is developed of the range of feasible beach slopes to be achieved during deposition. A comprehensive evaluation of the operational factors influencing the beach formation process is paramount to ensure that expected performance during design stages is met throughout operations. This paper presents the derivation of a dimensionless parameter for non-Newtonian flows, associated with sheet flows on an inclined plane, which directly relates to the tailings beach slope expected to be formed due to subaerial disposal. This dimensionless parameter provides a closed expression for estimating tailings beach slopes based on rheological properties and discharge rates considering that sheet flow mechanisms occur. Conditions for sheet flow occurrence, such as level of further dewatering of the beach after deposition, active discharge times and geometry of active discharge areas, can be derived within this formulation. The dimensionless parameter and conditions found to promote sheet flow also allow to address the advantages and limitations of different discharge operation strategies, such as operating the tailings facility by sectors (allowing drying cycles) of varying geometries. Evaluation of this approach in the light of case histories is presented. Finally, discussion on how to evaluate the potential of having concave tailings beach profiles within this formulation is provided.

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“…It provides information used to design the dam and plan total stored volume and period lifts (Fitton, 2006;Henriquez & Simms, 2009). Therefore, being able to predict the height and the shape of the stack throughout its lifetime is necessary for engineers (Fourie & Gawu, 2010;Williams & al., 2008).…”

Section: Conventional Depositionmentioning

confidence: 99%

“…From field observations, tailings first flow in a thin sheet that spreads out in a lobe shape from the deposition point. During this initial phase of the flow, the beaching profile can be described as a parabola, with a larger slope at the front and a relatively gentle slope of the rest of the beach with an average slope that varies between 0.5% and 4% (Fourie, 2010;Simms, 2013;Fitton, 2006).…”

Section: Post-deposition Behavior Of Tailingsmentioning

confidence: 99%

Field Scale Flow Modeling of Thixotropic Mine Tailings Using the Material Point Method

Parent¹

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Understanding free surface flow of mine tailings is necessary to plan deposition operations in tailings' storage facilities (TSF), and is important to predict the consequences of a dam break. Proper understanding of deposition operations has probably hindered adoption of alternative tailings technologies, wheras recent failures of tailings impoundments have had catastrophic consequences. Flow behavior is crucial to understand for effective risk mitigation. Tailings exhibit thixotropic properties-their behavior is a function of the material's stress history. A thixotropic constitutive model has been implemented into an open-source Material Point Method (MPM) framework. The results were validated with previous experimental data at laboratory scale and compared with Bingham rheology with good agreements. Large-scale simulations were done for 2D and 3D cases. The thixotropic model was able to model self-forming channels seen during field scale deposition, which Bingham rheology is unable to capture. Dam break events also scaled differently from laboratory scale experiments with thixotropy. This can possibly be an element that explains longer runouts then initially predicted with standard rheology.

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The validity of laboratory flume data for predicting beach slopes of thickened tailings deposits

Cited by 10 publications

References 5 publications

Beaching angles and evolution of stack geomoetry for thickened tailings - a review

Beaching angles and evolution of stack geomoetry for thickened tailings - a review

Tailings beach slopes as a dimensionless parameter of non-Newtonian flows

Field Scale Flow Modeling of Thixotropic Mine Tailings Using the Material Point Method

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