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On Cone Penetration Tests in Tailings: The need for a calibration chamber
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering. Boliden Mineral AB.ORCID iD: 0009-0008-3619-4851
2024 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2024.
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
Keywords [en]
Tailings, Cone Penetration Test, Calibration chamber
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-105409ISBN: 978-91-8048-570-8 (print)ISBN: 978-91-8048-571-5 (electronic)OAI: oai:DiVA.org:ltu-105409DiVA, id: diva2:1856837
Presentation
2024-09-10, E632, Luleå University of Technology, Luleå, 10:00 (Swedish)
Supervisors
Available from: 2024-05-08 Created: 2024-05-08 Last updated: 2024-05-08Bibliographically approved
List of papers
1. Design of a Calibration Chamber for CPT in tailings
Open this publication in new window or tab >>Design of a Calibration Chamber for CPT in tailings
(English)Manuscript (preprint) (Other academic)
Keywords
Tailings, Laboratory Tests, Liquefaction
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-105407 (URN)
Available from: 2024-05-08 Created: 2024-05-08 Last updated: 2024-05-08
2. Towards better understanding of CPT data on tailings
Open this publication in new window or tab >>Towards better understanding of CPT data on tailings
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2023 (English)Conference paper, Published paper (Other academic)
Abstract [en]

Characterization of tailings deposits is associated with significant challenges in tailings dam design and dam safety assessments. One of the challenges is static liquefaction in the deposited tailings and how this has to be addressed in stability assessments. Concerns have led to design concepts that deposited tailings considered susceptible to liquefaction, will liquefy. Facillities should therefore be designed for such post-liquefaction scenario, i.e. fluidized tailings. Existing upstream-constructed tailings dams are seldom built for a design case with post-liquefaction strength in the tailings. Consequently, mining companies must take dam safety-enhancing measures and rapidly conduct major changes in their tailings dam design.

At the same time, there are questions and uncertainties in evaluating static liquefaction potential in tailings that must be addressed. The uncertainties are, among others, related to differences between natural sands and tailings. There is a need to address the applicability of today’s evaluation methods on tailings and this paper will describe how a research project at Luleå University of Technology, funded by Boliden, will investigate and address the uncertainties in the evaluation. Cone Penetration Testing (CPT) in a calibration chamber will be undertaken in the project. A new calibration chamber for CPT is developed, where silty-sandy tailings material will be tested in a controlled laboratory environment. Combined with other laboratory test results, the CPT calibration chamber results will be used to derive new and update existing correlations between CPT data and tailings properties. The research will focus on the mechanical properties of tailings and its influence on the soil behavior around the penetrating cone. This paper will highlight uncertainties in state interpretation from CPT in tailings, present the design work of the calibration chamber and the expectations for the outcome of the CPT calibration chamber research.

National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-103821 (URN)
Conference
91st Annual ICOLD Meeting, June 13-14, 2023, Gothenburg, Sweden
Note

Funder: Boliden Mineral AB

Available from: 2024-01-18 Created: 2024-01-18 Last updated: 2024-05-08Bibliographically approved
3. Effect of increased vertical stress on the state of grains in tailings
Open this publication in new window or tab >>Effect of increased vertical stress on the state of grains in tailings
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

The mining industry has experienced rapid growth, leading to the accumulation of substantial mine waste, commonly referred to as tailings. Tailings are typically stored in tailings storage facilities, conventionally consisting of an impoundment surrounded by tailings dams. The construction of tailings dams can involve various methods, with the upstream method being commonly used in the industry. It is crucial to comprehend the long-term mechanical and geochemical behavior of deposited tailings to ensure the safety of upstream constructed tailings dams. The mineral composition, particle size distribution, and particle shape all affect the susceptibility to particle breakage or physical alternation. Therefore, there is an interest in understanding how grain size and grain shape relate to mineral composition and potential particle breakage to ensure the understanding of the long-term mechanical behavior. This study focuses on characterizing deposited tailings from various depths and investigates the impact of increased vertical stress on tailings, particularly examining the potential for crushing effects. The findings highlight the importance of considering these factors for a comprehensive understanding of tailings behavior and their implications for the long-term safety of tailings dams.

Keywords
Tailings, Mineralogy, Particle size distribution, Particle shape
National Category
Geotechnical Engineering Mineral and Mine Engineering
Research subject
Soil Mechanics
Identifiers
urn:nbn:se:ltu:diva-105408 (URN)
Available from: 2024-05-08 Created: 2024-05-08 Last updated: 2024-05-08

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