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Triaxial testing response of compacted iron ore tailings considering a broad spectrum of confining pressures

João Paulo Sousa Silva, Ana Luisa Cezar Rissoli, Pedro Pazzoto Cacciari, António Viana da Fonseca, Hugo Carlos Scheuermann Filho, Alexia Cindy Wagner, João Vítor de Azambuja Carvalho, Lucas Festugato and Nilo César Consoli

Article (2024)

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The filtered tailings disposal (dry stacking) up to 300 m high is an alternative to overcome the drawbacks related to the slurry tailings storage in large impoundments as it is safer and demands smaller portions of the existing landform. Even so, the understanding of the denser and dewatered material response over a broad range of confining pressures is essential to safely design tall dry stacking tailings facilities. Accordingly, the present research assesses the mechanical behavior of compacted iron ore tailings through triaxial tests. A series of compression and extension drained and undrained triaxial tests were conducted over a wide spectrum of confinements (σ́3 ranging from 75 to 8,000 kPa) to check possible particle breakage occurrence and effects. The influence of the initial density due to compaction was, as well, evaluated since the tests were performed using specimens molded at distinct dry unit weight values. The results were analyzed in the light of the critical state soil mechanics and have indicated the existence of a curvilinear critical state line in the ν: log ṕ plane. Small particle breakage has occurred and can be associated with reduction in surface roughness, breakage of asperities, and reduction in particle angularity. Moreover, a tendency for static liquefaction was observed amongst the loosest specimens sheared under the lowest confining levels.

Uncontrolled Keywords

Tailings; Iron ore tailings; Tailings dam; Filtered tailings disposal; Dry stacking; Critical state soil mechanics; Static liquefaction.

Subjects: 1000 Civil engineering > 1000 Civil engineering
Department: Department of Civil, Geological and Mining Engineering
Funders: Instituto Tecnológico Vale, Conselho Nacional de Desenvolvimento Científico e Tecnológico
PolyPublie URL: https://publications.polymtl.ca/57585/
Journal Title: Soils and Foundations (vol. 64, no. 2)
Publisher: Elsevier BV
DOI: 10.1016/j.sandf.2024.101438
Official URL: https://doi.org/10.1016/j.sandf.2024.101438
Date Deposited: 25 Mar 2024 15:05
Last Modified: 11 Apr 2024 01:56
Cite in APA 7: Silva, J. P. S., Rissoli, A. L. C., Cacciari, P. P., Fonseca, A. V. , Filho, H. C. S., Wagner, A. C., Carvalho, J. V. A., Festugato, L., & Consoli, N. C. (2024). Triaxial testing response of compacted iron ore tailings considering a broad spectrum of confining pressures. Soils and Foundations, 64(2), 101438 (15 pages). https://doi.org/10.1016/j.sandf.2024.101438


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