Iron tailings reclamation: geotechnical analysis during emerged and submerged excavations
Iron tailings reclamation: geotechnical analysis during emerged and submerged excavations
It is estimated that Brazil has around 570 Mt of iron ore stored in dams without a national reuse plan. This case study focuses on the Carajás Mine tailing dam, a reservoir with a volume of 100 Mm³ and iron ore content of 63%, located in the state of Pará. Regarding the geotechnical risk during excavations to remove the tailing, the present work identifies in depth the fine and coarse tailing through laboratory and field tests. Analyzes will be conducted to verify if the ruptures can represent a trigger that leads the tailing to liquefaction. The seismic piezocone tests (SCPTu) were reinterpreted considering perched water table, saturated specific weight equal to 30.1 kN/m³, cone factor (Nkt) equal to 15. Field seismic data were compared to laboratory seismic tests to determine the void ratio and shear modulus (G0) along the entire tailing profile, analyzing possible layers with liquefaction potential.
L. Rezende; Mauricio Ehrlich; A. Oliveira
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
C - Risk analysis and safety evaluation
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