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Orientador(es)
Resumo(s)
As crescentes inovações da construção civil implicam numa maior necessidade de estudos
detalhados da estrutura geotécnica do local de implantação, contudo, a pluralidade de
maciços terrosos origina pesquisas de alta complexibilidade, o que tem impulsionado o
desenvolvimento de estudos e ensaios cada vez mais modernos e detalhados. Em vista
disso, esta dissertação vem como uma contribuição literária para a avaliação do comportamento
mecânico dos solos, com ênfase no ensaio de corte direto automatizado. Para isso,
a proposta deste trabalho busca caracterizar a resistência mecânica de um solo arenososiltoso
localizado na região de Bragança-Portugal através dos equipamentos de corte direto
associado a uma configuração experimental baseada na abordagem LabVIEW, sensores
LVDT e uma placa de aquisição de dados. Dessa forma, a configuração descrita garante
repetibilidade e automação dos dados, evitando erros humanos durante a realização dos
ensaios. O corte direto é o mais antigo e usual teste laboratorial para avaliar os parâmetros
mecânicos dos solos através do critério de Mohr-Coumlomb e é orientado pela norma
ASTM D-3080/D-3080M-11. Ao decorrer da dissertação, são apresentadas as principais
generalidades dos ensaios laboratoriais, as etapas do ensaio de corte direto e as metodologias
para utilização do equipamento e realização dos ensaios. Sendo ao final, apresentada
a análise dos resultados obtidos, o que permite verificar que o solo estudado é de
baixa compacidade e apresenta caracteristicas de rotura plástica, além de demostrar que
a velocidade de carregamento não apresentou uma influência significativa na capacidade
resistente dos solos testados sob mesma tensão normal.
The growing innovations of construction imply a greater need for detailed studies of the geotechnical structure of the location. However, the plurality of earthy massifs originates highly complex research, which has driven the development of increasingly modern and detailed studies and tests. In this scenario, this dissertation comes as a literary contribution to the evaluation of the mechanical behaviour of soils, with emphasis on automated direct shear. The purpose of this study is to characterise the mechanical strength of a sandy-silt soil located in the region of Bragança-Portugal. This is was made through direct shear equipment associated with an experimental configuration based on the LabVIEW approach, LVDT sensors and a data acquisition board. The configuration described ensures repeatability and automation of the data, avoiding human errors during the tests. Direct shear is the oldest and most usual laboratory test to evaluate the mechanical parameters of soils through the Mohr-Coumlomb criterion and is guided by the ASTM D-3080/D-3080M-11 standard "Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions". During the dissertation, the main generalities of laboratory tests, the stages of the direct shear test and the methodologies for using the equipment and conducting the tests are presented. The results allow to verify that the analysed soil is of low compactness and presents characteristics of plastic rupture. The analysis also demonstrated that the loading speed did not have a significant influence on the resistant capacity of the tested soil under same normal stress.
The growing innovations of construction imply a greater need for detailed studies of the geotechnical structure of the location. However, the plurality of earthy massifs originates highly complex research, which has driven the development of increasingly modern and detailed studies and tests. In this scenario, this dissertation comes as a literary contribution to the evaluation of the mechanical behaviour of soils, with emphasis on automated direct shear. The purpose of this study is to characterise the mechanical strength of a sandy-silt soil located in the region of Bragança-Portugal. This is was made through direct shear equipment associated with an experimental configuration based on the LabVIEW approach, LVDT sensors and a data acquisition board. The configuration described ensures repeatability and automation of the data, avoiding human errors during the tests. Direct shear is the oldest and most usual laboratory test to evaluate the mechanical parameters of soils through the Mohr-Coumlomb criterion and is guided by the ASTM D-3080/D-3080M-11 standard "Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions". During the dissertation, the main generalities of laboratory tests, the stages of the direct shear test and the methodologies for using the equipment and conducting the tests are presented. The results allow to verify that the analysed soil is of low compactness and presents characteristics of plastic rupture. The analysis also demonstrated that the loading speed did not have a significant influence on the resistant capacity of the tested soil under same normal stress.
Descrição
Mestrado de dupla diplomação com a Associação Educativa Evangélica - UniEvangélica
Palavras-chave
Caracterização mecânica Corte direto Ensaio laboratorial