Ensaios triaxiais de extensão em um rejeito de minério de ferro

Detalhes bibliográficos
Ano de defesa: 2019
Autor(a) principal: Fabre, Juliana Santos
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal do Rio de Janeiro
Brasil
Instituto Alberto Luiz Coimbra de Pós-Graduação e Pesquisa de Engenharia
Programa de Pós-Graduação em Engenharia Civil
UFRJ
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://hdl.handle.net/11422/13693
Resumo: In this study, iron tailings from the Fundão Dam were studied by means of drained triaxial extension tests. Several authors concluded that triaxial extension in soils is more likely to exhibit strain localization (ROSCOE et al., 1963; YAMAMURO and LADE, 1995; LADE et al., 1996; WU and KOLYMBAS, 1991), which amplifies the radial strains in the sample, resulting in incorrect calculation of the stress level. In order to overcome this problem, YAMAMURO and LADE (1995) proposed an apparatus that enforces uniform strains in the sample, while WU and KOLYMBAS (1991) used strain collars to measure the change in the sample radius. The solution adopted in this research was to use digital photographs and CAD software to measure the actual diameter during the shear stage. This actual diameter was used to determine the cross-sectional area and the vertical stress. The effects of edge distortion on photographs and parallax were considered, as well as corrections for the phenomenon of optical refraction. This method is an accessible alternative to be applied in extension tests carried out in conventional equipment. The shear strength and the critical state line determinations were satisfactory and compared well to other results of the same material.