Avaliação de mecanismos não convencionais de instabilização de encostas: o papel das poropressões de ar
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2016-08-29
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Universidade Federal de Goiás
Resumo
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.
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TERRA, V. S. Avaliação de mecanismos não convencionais de instabilização de encostas: o papel das poropressões de ar. 2016. 117 f. Dissertação (Mestrado em Geotecnia, Estruturas e Construção Civil) - Universidade Federal de Goiás, Goiânia, 2016.