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Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-5987-0006Edeskär, Tommy Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.Knutsson, Sven Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-1365-8552 2017 (English)In: The Electronic journal of geotechnical engineering, ISSN 1089-3032, E-ISSN 1089-3032, Vol. 22, no 06, 1717-1730 p.Article in journal (Refereed) Published

Abstract [en] : Tailings dams are raised with time depending upon rate of generation of waste. A tailings dam can contain different particle sized materials within its dam body. The newly raised embankment in a tailings dam can be considered as vertical load being applied on subsequent layer. The applied loads can cause deformations and breakage of particles. The particle breakage can then lead to a skeleton with new particle size particles and hence can lead to new material properties. This paper provides the results from triaxial tests conducted on uniformed particle sizes as, 0.5mm-0.25mm, 0.25mm-0.125mm and 0.125mm-0.063mm.  The tests are performed at various effective radial stresses. The results are evaluated and compared with each particle size. The results include stress-strain and volumetric behavior during shearing, the effective stress ratio and stress-dilatancy plot. The friction angles are also evaluated and compared with different particle sized specimens. It was found that effective stress ratios were slightly higher when tests were performed at lower confining stresses and vice versa. It was also observed that particle size did not show any effect of friction angles.

Place, publisher, year, edition, pages: 2017. Vol. 22, no 06, 1717-1730 p.

Keyword [en] : Shear Strength, Triaxial Tests, Tailings Dams, Mechanical Properties, Tailings

National Category : Geotechnical Engineering

Research subject: Soil Mechanics

Identifiers: URN: urn:nbn:se:ltu:diva-62645OAI: oai:DiVA.org:ltu-62645DiVA: diva2:1084074

Note: Validerad; 2017; Nivå 1; 2017-04-03 (andbra)Available from: 2017-03-23 Created: 2017-03-23 Last updated: 2017-06-27Bibliographically approved

In thesis: 1. Mechanical Behavior of Tailings: Laboratory Tests from a Swedish Tailings DamOpen this publication in new window or tab >>Mechanical Behavior of Tailings: Laboratory Tests from a Swedish Tailings DamBhanbhro, RiazLuleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.2017 (English)Doctoral thesis, comprehensive summary (Other academic)

Abstract [en]: Tailings is leftover material from mining industry and is produced in huge quantities approximately 70-99% of the ore production.  Tailings material is stored as impoundments by constructing tailings dams which are often constructed with tailings material itself. Tailings are artificial material and the mechanical behavior of tailings material upon loading is different as compared to natural soil materials. There are number of dam failures reported every year which has severe impact on inhabitants and environment nearby. Considering the failures of tailings dams and consequences there is a need to understand the tailings material in depth for safe existence of these dams. The confident dam design can assure the safe existence of tailings dams for long term as these dams are presumed to function for generations to come. The material properties in tailings dams can change during operation due to raising of new layer. Raised new layer can change stress level, which in turn may change the material properties in terms of strength, pore pressures, grain sizes etc. Today mostly tailings dam are designed by performing analysis for safety for existing and future rasings as well. These analyses are based upon a for certain factor of safety. Not very much can be done with design and analysis for tailings material if the material is not described very well. Understanding of tailings material in depth can provide help for detailed material parameters which later can be used in safety assessment for future raising and changed conditions in dam.This study presents the work carried out on tailings material from a Swedish tailings dam. The study is conducted on undisturbed and disturbed tailings material. The undisturbed tests are carried out to understand material properties as per in-situ conditions. Whereas disturbed materials are used to created different materials with different particles sizes. Initially in this study the basic properties of tailings materials are studied e.g. specific gravity, phase relationships, particle sizes, particle shapes and shear behavior on collected samples at various depths. During direct shear tests, the unexpected vertical height reductions were observed, these results are presented in this study. The comparison of strength parameters by direct shear and triaxial tests on material from various depths is also done and presented.Based on results from direct shear, triaxial and oedometer tests on uniform sized tailings material; the evaluation of primary and secondary deformations and particle breakage and effect of vertical loads is also carried out and presented. The study also includes the comparison of strength parameters for each particles size. The breakage of particles is analyzed by sieving the material after direct shear tests followed by a particle shape study. The effect of deposition on shear strength parameters is also studied by construction of samples with different angle of deposition of material. The strength parameters of uniform sized particles in triaxial tests are also evaluated and discussed.

Place, publisher, year, edition, pages : Luleå: Luleå University of Technology, 2017

Series : Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544

Keyword: Tailings dams, Tailings, Mechanical Behavior, Oedometer, Direct Shear, Triaxial, Shear strength

National Category : Geotechnical Engineering

Research subject : Soil Mechanics

Identifiers: urn:nbn:se:ltu:diva-62534 (URN)978-91-7583-849-6 (ISBN)978-91-7583-850-2 (ISBN)

Public defence : 2017-04-25, F1031, Luleå tekninska universitet, Luleå, 10:00 (English) Available from: 2017-03-20 Created: 2017-03-16 Last updated: 2017-05-11Bibliographically approved



Author: Bhanbhro, Riaz

Source: http://ltu.diva-portal.org/







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