Consolidação de um rejeito de mineração de areia e modelação do enchimento de um reservatório para sua disposição / Sand-mining waste disposal consolidation and a waste reservoir filling process modeling for its storage

AUTOR(ES)

Luis Miguel Cañabi Quispe

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

04/04/2011

RESUMO

Mining waste is frequently disposed of in the form of mud. The storage capacity of a collection reservoir of mining waste depends on its dimensions and on its operational processes, which are based on the physical characteristics of the mud and its compressibility and hydraulic conductivity. This research focuses on the study of the consolidation characteristics of a clayey mud resultant from the process of sand mining. Such characteristics were studied through Hydraulic Consolidation Tests (HCT) and by modeling the waste reservoir filling process using large deformation theory and the CONDES software. Characterization and hydraulic consolidation tests were performed on samples obtained from Reservoirs 2 and 11 and from the Jundu Mine spillway at Descalvado City in the state of São Paulo, Brazil. The characterization parameters obtained were employed in performing numerical analysis of the filling process of waste reservoir 11. HCT test results show the acceptable set of constitutive properties of the analyzed material. During the testing procedures, variability of test results were minimized by obtaining stabilized pressure difference readings between the top and bottom leads of the specimen. Modeling was conducted for instantaneous and progressive filling and both methods yielded the same results. It was observed a predictable parity between the results obtained from instantaneous and progressive filling simulations. The final height after consolidation was measured at approximately two years for both instantaneous and progressive methods of filling. From the analysis, the two-year level was measured at 1.57 meter.

ASSUNTO(S)

compressibilidade compressibility condutividade hidráulica consolidação consolidation hct hct hydraulic conductivity

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