Caracterizações geotécnica e mineralógica de um filito dolomítico do Quadrilátero Ferrífero com vistas ao estudo de estabilidade de taludes incorporando a sucção

• Autor(a) principal: Soares, Ecidinéia Pinto
• Data de Publicação: 2008
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/804
• topic: Filito dolomítico; Caracterização geotécnica; Mineralogia; Sucção; Quadrilátero Ferrífero; Dolomitic phyllites; Geotechnical characterization; Mineralogy; Suction; Iron Quadrangle (MG, Brazil); CNPQ::ENGENHARIAS::ENGENHARIA CIVIL::GEOTECNICA

The present work presents the results of an extensive laboratory test study for the characterization of the behavior of a dolomitic phyllite under unsaturated conditions. This rock type is commonly found at Iron Quadrangle area, Brazil and is well known for its high anisotropy and weatherability. These properties impose a distinct behavior as sound rock changes to very to highly weathered materials in several months, with severe influence on its geotechnical properties. Eight undisturbed samples were collected in two open mine pits belonging to Vale (four at Pico mine and four at Capitão do Mato mine). Both mineralogical and geotechnical characterization of these material were done. Suction curves were determined through filter paper technique. Both unsaturated strength envelope and verification of suction curves were determined through empirical method. Resulting data was used into a slope stability study of a typical geological section from Pico mine, in order to evaluate its influence over safety. Use of other models and procedures is suggested to subsidy future discussion on risk analysis of open pit mining for this particular region.