Shear Strength in Uniformed Sized Tailing Particles
Number of Authors: 4
(English)In: International Journal of Geotechnical Engineering, ISSN 1938-6362, E-ISSN 1939-7879Article in journal (Refereed) Submitted
Mining industry provides mineral to the modern society. Minerals are indispensable raw materials for commodities. A by-product of the mineral extraction is the mine waste also called tailings. Tailings are safety storage in tailing dams. Tailings dams troughs the history had had incidents and failures. Economic, environmental and social consequences of a tailing dam failure could be devastating. Soil strength is given by the consolidation, particle shape, stresses path, water content, hydraulic conductivity among other factors. Change on these factors produces changes in the soil strength. The development of economical and fast tests could improve the safety of the tailings deposits. Drained direct shear tests using uniformed graded tailing particles were performed. Three different size ranges 0.25, 0.125 and 0.063mm were used. Effect of particle size on shear strength and the effect of shearing on the tailing particles were studied. Normal consolidation pressure, void ratio, particle size and particle shape were monitored properties. Strength of the tailings was related with the monitored properties to suggest four empirical relations, two of them base in the morphology of the particle and two bases in the angularity. Results have shown that particle elongation diminishes the tailings strength but the angularity increases the strength. Particle size results are ambiguous and seem to be more related with the shape descriptor.
tailings dams, direct shear tests, tailings, particle breakage, particle shapes
Research subject Soil Mechanics
IdentifiersURN: urn:nbn:se:ltu:diva-61802OAI: oai:DiVA.org:ltu-61802DiVA: diva2:1071108