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Modelling unsaturated silty tailings and the conditions required for static liquefaction
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Wang, Yanzhi, Vo, Thanh Liem and Russell, Adrian R. (2023) Modelling unsaturated silty tailings and the conditions required for static liquefaction. Geotechnique . doi:10.1680/jgeot.22.00074 ISSN 0016-8505. (In Press)
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Official URL: https://doi.org/10.1680/jgeot.22.00074
Abstract
The potential for static liquefaction of tailings is a major focus in the design and operation of tailings storage facilities. This research models the behaviour of unsaturated tailings, with a variety of degrees of saturation, addressing the propensity for static liquefaction during monotonic loading. Unsaturated triaxial tests, including constant suction conditions and constant water-air mass conditions, were performed. A bounding surface plasticity model was used to simulate the results. The constant mass condition is relevant to undrained closed-system loading, which may prevail during fast-deformation after the tailings becomes unstable, when the air and water in the pore space remain locked inside the tailings. Boyle's law and hydraulic hysteresis were accounted for to model the changes of pore air and water pressures, and suction, with the tailings volume change. Good agreements were achieved between test results and model simulations. Additional simulations which mimic rising water tables under constant total stress states in the field, situations which may trigger instabilities, are also shown. Results are added to charts which relate peak and post-liquefaction strengths, and collapse lines, to measures of initial state, for unsaturated conditions, which may be of use in practice.
Item Type: | Journal Article | |||||||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | |||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | |||||||||
SWORD Depositor: | Library Publications Router | |||||||||
Library of Congress Subject Headings (LCSH): | Tailings (Metallurgy), Soil liquefaction, Boundary value problems | |||||||||
Journal or Publication Title: | Geotechnique | |||||||||
Publisher: | ICE Publishing | |||||||||
ISSN: | 0016-8505 | |||||||||
Official Date: | 20 March 2023 | |||||||||
Dates: |
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DOI: | 10.1680/jgeot.22.00074 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | In Press | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
Date of first compliant deposit: | 14 June 2023 | |||||||||
Date of first compliant Open Access: | 20 March 2024 | |||||||||
RIOXX Funder/Project Grant: |
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