Determination of water storage and permeability functions for oil sands tailings

Fredlund, D. G.; Stone, J.W.; Stianson, Jason; Sedgwick, Andrea

doi:10.14288/1.0107734

Cited by 5 publications

(2 citation statements)

References 1 publication

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“…The AEV of the ILF-FFT is beyond 400 kPa matric suction and cannot be displayed on this curve. The inflection on the curve around 10 kPa does not represent the AEV, determined from the degree of saturation curve (Fredlund et al 2011). The complete SWCC of the ILF-FFT can be determined in combination with a second apparatus for high suction measurements.…”

Section: Solids and Water Contentsmentioning

confidence: 99%

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Consolidation and unsaturated properties of in-line flocculated fluid fine tailings and centrifuged tailings from oil sands mines

Kabwe¹,

Wilson²,

Barsi³

et al. 2023

Paste 2023: 25th International Conference on Paste, Thickened and Filtered Tailings

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Canadian government regulatory and closure commitments for oil sands mines and tailings ponds compel oil sands companies to dewater and reclaim the fluid fine tailings (FFT) in the tailings ponds. As a result, extensive research is underway by several organisations to develop methods to understand the reasons for the slow consolidation of FFT and to design treatment methods for mine closure. The most promising technologies for oil sands tailings dewatering are thickening and centrifugation. In this research, large strain consolidation (LSC) and modified Tempe cell, using axis translation technique with shear strength tests, were conducted on in-line flocculated fluid fine tailings and centrifuged cake tailings samples. These tests determine the treated tailings' consolidation, geotechnical properties, unsaturated characteristics and shear strength. The results of the tests provided several useful engineering functions relating matric suction and effective stress to shear strength, solids contents, and water contents. The modified Tempe cell technique, however, yielded results four times faster than the LSC test technique. The methods and evaluations of the engineering functions are discussed.

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Section: Solids and Water Contentsmentioning

confidence: 99%

“…The complete SWCC of the ILF-FFT can be determined in combination with a second apparatus for high suction measurements. This process falls outside the main scope of this research; however, a description of this process can be found in Fredlund et al (2011).…”

Section: Solids and Water Contentsmentioning

confidence: 99%

Consolidation and unsaturated properties of in-line flocculated fluid fine tailings and centrifuged tailings from oil sands mines

Kabwe¹,

Wilson²,

Barsi³

et al. 2023

Paste 2023: 25th International Conference on Paste, Thickened and Filtered Tailings

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Microbiological and geotechnical characterization of oil sands tailings in relation to acid rock drainage

Dean¹

2015

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Tailings initial consolidation and evaporative drying after deposition

Li¹,

Been²,

Wislesky³

et al. 2012

Proceedings of the 15th International Seminar on Paste and Thickened Tailings

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Tailings and mine waste management has an ever-growing importance in mining, including the oil sands industry. Dewatering technologies are being adopted and further developed to reduce the environmental and social impacts of tailings management facilities as well as the risks associated with possible failure of dams that retain liquid or liquefiable tailings. The geotechnical performance of tailings deposits is one of the key issues that needs to be fully addressed for large mining projects, including oil sands projects. It has been demonstrated (Li et al., 2009) that the initial void ratio of tailings immediately following deposition is a critical parameter that affects the performance of tailings deposits under both static and seismic loading conditions, particularly the post-liquefaction stability of tailings deposits. This paper presents a design method that draws upon geotechnical modelling techniques to predict the initial void ratio of tailings following self-weight consolidation and evaporative drying achieved through thin layer deposition. The self-weight consolidation model is based on a large strain consolidation theory (Gibson et al., 1967). For evaporative drying, the governing equation is based on a desiccation model (Gilliland and Sherwood, 1933) established for moisture migration within fine-grained soils due to evaporative drying, but the method also incorporates the soil-water characteristic curve equation (Fredlund and Xing, 1994). Analytical solutions have been derived for the governing equations. The modelling tools developed and presented in this paper provide a means to estimate an optimum layer thickness and drying period to increase in situ density of tailings and reduce the liquefaction potential of tailings deposits.

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Determination of water storage and permeability functions for oil sands tailings

Cited by 5 publications

References 1 publication

Consolidation and unsaturated properties of in-line flocculated fluid fine tailings and centrifuged tailings from oil sands mines

Consolidation and unsaturated properties of in-line flocculated fluid fine tailings and centrifuged tailings from oil sands mines

Microbiological and geotechnical characterization of oil sands tailings in relation to acid rock drainage

Tailings initial consolidation and evaporative drying after deposition

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