Experimental landfill of filtered iron ore flotation tailings at Minas-Rio system
Experimental landfill of filtered iron ore flotation tailings at Minas-Rio system
An experimental landfill was built at Serra do Sapo Mine using filtered iron ore flotation tailings. The main purpose was to evaluate the constructive methodology regarding the equipment, layers thickness and geotechnical evaluation of the material behaviour in order to support the development of a filtered tailings pile design. The landfill consists of eleven layers: eight of them with 0.50m and three with 0.70m thickness. After each layer completion, sand replacement method tests were carried out to determine the in-situ density and verify the material compaction. In addition, samples were also collected in all layers to obtain the water content and compaction using oven-drying method and Standard Proctor tests. According to tests results, the material was compacted with a water content below the optimum moisture content and a greater in-situ density due to higher compaction energy. In the 2nd, 5th, 9th and 11th layers, geotechnical characterization, drained and undrained triaxial tests were conducted. Regarding geotechnical characterization, the material is a fine silty sand and does not present variations on the particle size distribution. In order to monitor the pore pressures during the landfill implementation, three piezometers were installed and there is no significant variation in data results and low values of increase in pore water pressure during the layers construction.
D. G. Amorim; L. F. Silva; F. F. Rezende; T. A. Nicoli; U. Albino; F. Saliba; R. C. Silva
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
C - Risk analysis and safety evaluation
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