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Título

NUMERICAL SIMULATION OF THE STRESS-STRAIN BEHAVIOR OF AN IRON ORE TAILINGS FROM THE QUADRILÁTERO FERRÍFERO

Resumo

Recent tailings dam failures indicated the need to develop careful stress-strain analysis in the Brazilian mining industry, especially for structures with brittle behavior. In this context, Critical State Soil Mechanics can be considered a useful approach to better reproduce the material behavior, given the use of the critical state concept. The objective of the present paper is to promote a discussion about the numerical simulation of the stress-strain behavior of an iron ore tailings of the Quadrilátero Ferrífero, considering the calibration of drained triaxial tests using two constitutive models: i) Mohr-Coulomb, widely used in Brazil; and ii) NorSand, which considers the critical state theory in its formulation. GeoStudio (SIGMA/W) software was used to develop the numerical simulation, as well as the data available in the literature to define the material geotechnical characterization was used. About the results, the Mohr-Coulomb model confirmed its limitations in terms of perfectly plastic response, while NorSand presented the best calibration, which can be associated with the use of the largest number of parameters, the application of the state parameter concept, and the silty nature of the tailings analyzed. Additionally, it was observed difficulty in simulating the material dense behavior.

Palavras-chave

Critical State Soil Mechanics, Mohr-Coulomb, NorSand

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