Esse artigo apresenta alguns resultados do trabalho de pesquisa realizado para preparação da tese de doutorado sobre a utilização da simulação da fragmentação no processo de desmonte de rochas por explosivos. É apresentado um programa de computador denominado SIMBLAST que utiliza a linguagem de programação Visual Basic. O programa foi desenvolvido com base nos modelos Kuz-Ram e TCM -Two Components Model, descritos nesse artigo. Os dados para teste do simulador foram levantados nas detonações de hematita dura (HD) e hematita mole (HM), nas minas de minério de ferro de Carajás, da Companhia Vale do Rio Doce, localizadas no sul do Estado do Pará, com a finalidade de comparação dos resultados da curva granulométrica gerada pelos dois modelos. Palavras-chave:
SUMMARYIndicator kriging has been applied to the study of failure mechanisms in a mine slope in Minas Gerais, Brazil, to estimate potential failure risks in limited areas along this slope. Timbopeba Mine, Vale Company, is an open pit iron mine situated in the Quadrilátero Ferrífero, a very important mining district in Minas Gerais. A slope excavated in quartzite with a maximum height of 200 m at the time of this study, has presented many failure problems involving the sliding of blocks formed by discontinuities. These blocks are of limited size in comparison to the dimensions of the overall slope. They appear along the entire slope, wherever discontinuity orientations have led to the kinematic feasibility of these blocks. Geostatistics permits the estimation of local failure probability distributions associated to these local failures, which would not be possible with traditional statistical models. The geostatistical method employed in this study, indicator kriging, is quite suitable because it is unnecessary to assume a particular global distribution of the phenomena being modeled. The model was used for locating areas with a great tendency for sliding failure, as it considers the local spatial variability of discontinuity orientations.
Esse trabalho é parte de pesquisa realizada para preparação de tese de doutorado e apresenta estudo do fluxo por gravidade de material fragmentado em mineração subterrânea. É descrita a prática corrente em minas brasileiras e estrangeiras, enfocando os índices de acidentes, as ações preventivas e corretivas nas operações que utilizam o fluxo por gravidade de minério desmontado em passagens, presentes em diversos métodos de lavra, como na lavra por subníveis, por corte e enchimento e nos métodos que utilizam o abatimento controlado do teto da escavação subterrânea.
This article shows some results of a doctorate thesis about the gravity flow of bulk material in an underground mine. It describes the practices in Brazilian mines and in other countries, focusing on accident data, preventive and corrective actions, in mining operations that use gravity flow to transport fragmented material from the excavation of ore passes in several mining operations, such as in underground mining using cut and fill methods and caving methods
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