Mechanical Properties of Tailings: Basic Description of a Tailings Material from SwedenReport as inadecuate

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Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-5987-0006 2014 (English)Licentiate thesis, comprehensive summary (Other academic)

Abstract [en] : Tailings dams are constructed to store waste material from mining industry and usually these dams are raised with time depending upon production rate. Tailings material is sometimes used in construction of tailings dams. Tailings are artificial material and the behavior of tailings material upon loading is different compared to natural soil materials. The mechanical properties of tailings have influence on the performance of a tailing dam. Since the tailings dams are constructed to withstand for long times, it is essential to understand tailings materials in depth in order to assure safe existence of the dams in short term as well as in long term perspective. This licentiate thesis describes the present work carried out on sulphide rich tailings from one mine in Sweden. The material presented is based upon material from three different papers. The first paper describes the basic characteristics of tailings which includes; specific gravity, phase relationships, particle size, particle shape and direct shear behavior. The second paper discusses direct shear tests carried out on tailings from one Swedish mine. Shear strength parameters are evaluated and results from 27 tests (15 drained and 12 undrained tests) are discussed. This paper also describes the vertical height reductions observed during direct shear tests. The third paper focuses on the laboratory results from triaxial tests conducted on tailings materials. This paper shows the drained behavior of tailings under application of different consolidation pressures.The results from particle analysis showed that smaller particles were very angular and bigger particles were sub angular. The material was classified as silt and silty sand. The average particle density (ρs) is 2.83t/m3. The dry density and void ratios were found to be 1.18–1.65 t/m3 and 0.72–1.41 respectively. During direct shear tests vertical height reductions were observed with slight increment in pore pressures. The strain hardening behavior was observed in both drained and undrained conditions in direct shear tests. The strength parameters determined in triaxial test were higher than of those calculated in direct shear tests. Friction angle ϕ' in triaxial tests were found to be 39 to 41degrees and it did not showed any effect with relation to depth. The cohesion and friction angle in direct shear test at 0.15radian, in drained tests were found as in range of 9.7-33.7kPa and 12.5-18.3 degrees respectively. The same parameters for undrained tests were found as 7.1-16.1 kPa and 16.0-20.4 degrees for cohesion and friction angle respectively.

Place, publisher, year, edition, pages: Luleå tekniska universitet, 2014. , 134 p.

Series : Licentiate thesis / Luleå University of Technology, ISSN 1402-1757

Keyword [en] : Tailings dams, tailings properties, shear strength, mechanical properties, Civil engineering and architecture - Geoengineering and mining engineering

Keyword [sv] : Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik

National Category : Geotechnical Engineering

Research subject: Soil Mechanics

Identifiers: URN: urn:nbn:se:ltu:diva-16952Local ID: 0e2512e4-64b6-4e80-ae87-eada1cb2dbedISBN: 978-91-7439-992-9 (print)ISBN: 978-91-7439-993-6 (electronic)OAI: diva2:989943

Note: Godkänd; 2014; 20140818 (riabha); Nedanstående person kommer att hålla licentiatseminarium för avläggande av teknologie licentiatexamen. Namn: Riaz Bhanbhro Ämne: Geoteknik/Soil Mechanics and Foundation Engineering Uppsats: Mechanical Properties of Tailings Basic Description of a Tailings Material from Sweden Examinator: Professor Sven Knutsson, Institutionen för samhällsbyggnad och naturresurser, Luleå tekniska universitet Diskutant: Adjungerande professor Peter Viklander, Vattenfall AB, Luleå Tid: Torsdag den 18 septemebr 2014 kl 10.00 Plats: F1031, Luleå tekniska universitetAvailable from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-02-08Bibliographically approved

Author: Bhanbhro, Riaz



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