Avaliação de mecanismos não convencionais de instabilização de encostas: o papel das poropressões de ar

• Ano de defesa: 2016
• Autor(a) principal: Terra, Victor Scartezini
• Orientador(a): Gitirana Junior, Gilson de Farias Neves
• Banca de defesa: Gitirana Jr, Gilson de Farias Neves, Sales, Maurício Martines, Guimarães, Leonardo José do Nascimento
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Geotecnia, Estruturas e Construção Civil (EEC)
• Departamento: Escola de Engenharia Civil - EEC (RG)
• País: Brasil
• Palavras-chave em Português: Solos não saturados; Poropressão de ar; Estabilidade de taludes; Descargas atmosféricas
• Palavras-chave em Inglês: Unsaturated soils; Pore-Air Pressure; Slope stability; Atmospheric discharges
• Área do conhecimento CNPq: ENGENHARIAS
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/6797

Natural disasters related to landslides have caused thousands of deaths and left tens of thousands homeless people around the world. Landslides can occur in most cases due to factors related to water infiltration on soil, causing a raise in the positive pore-water pressure. But what is often observed is that both water infiltration and the reduction of negative pore-water pressure due to water infiltration are not, in practice, enough to justify some of the observed landslides. Some less conventionals mechanisms, such as lightning, are not, usually, taken in consideration in a failure analysis, but can contribute to the factor of safety reduction. This paper aims to study the effects of atmospheric discharges in the stability of natural slopes of residual soils. Partial differential equations governing the coupled flow of pore-water and pore-air are developped. The numerical modeling is made with the FlexPDE software, version 6. The results show that there is a raise on pore-air pressure inside the soil due to atmospheric discharge. However, the raise of pore-air pressure works both in the raise of the apparent cohesion and the reduction on net pressure. It is concluded that any failure due to atmospheric discharge will present a shallow slip surface.