Modelo geomecânico da Sequência Canto em galerias da Mineração Fazenda Brasileiro - BA

• Autor(a) principal: Sala, Leonardo Alberto [UNESP]
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/155473; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-06-07/000884692.pdf; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-06-07/000884692_video_01.wmv
• topic: Mecânica do solo; Mecânica de rochas; Minas e recursos minerais; Bahia

Once excavated, an underground mine gallery can show an unexpected geomechanics condition with a higher incidence of falling blocks and potential for wedge failures. The better characterized the geomechanical rock mass behavior, the better the accuracy will be for mine planning, optimizing production and reducing operation costs. The studied objects of this research were five galleries of Fazenda Brasileiro Mining, in Barrocas-BA, belonging to the company Brio Gold. The study area is composed of rocks from Canto Sequence, formed in a transpressive evolution context at Rio Itapicuru Greenstone Belt. It is an acid volcanic sequence, very fractured, interbedded with graphite schists that infills the discontinuity plans, reducing friction forces. This scenario results in high wedge failure and falling blocks potential. The differential of this work was the creation of a methodology that integrates different classifications systems in a single geomechanical model, through correlation equations and retro analysis based on field observations. This work is aimed to create a geomechanical model through the integration of geotechnical analysis and geomechanical classes maps. The galleries were preliminarily divided into windows with same geological-structural patterns, following field observations criterion. In each window, fault mapping and discontinuity characterization were made, analyzing parameters such as spatial orientation, frequency, spacing, persistence, roughness, aperture and infilling material. The collected data at this stage was applied to rock mass classifications: Rock Quality Designation - RQD (PALMSTRON, 1982), Rock Mass Rating - RMR (BIENIAWSKI, 1989) e Tunneling Quality Index - Q (BARTON et al., 1974). Such classifications, when made along underground mine galleries, ... (Complete abstract electronic access below)