Análise numérica de dutos enterrados sujeitos a elevação e recalque localizado
Problems associated to longitudinal interactions in buried pipelines are characterized as three-dimensional and can lead to different soil-pipe issues. Despite the progress achieved in research on buried pipelines, little attention has been given to the three-dimensional nature of the problem thr...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/19560 |
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| Resumo: | Problems associated to longitudinal interactions in buried pipelines are
characterized as three-dimensional and can lead to different soil-pipe issues. Despite
the progress achieved in research on buried pipelines, little attention has been given
to the three-dimensional nature of the problem throughout the last decades. Most of
researches simplify the problem by considering it in plane strain condition. This
dissertation aims to present a study on the behavior of buried pipelines under local
settlement or elevation, using three-dimensional simulations. Finite element code
Plaxis 3D was used for the simulations. Particular aspects of the numerical modeling
were evaluated and parametric analyzes were performed, was investigated the
effects of soil arching in three-dimensional form. The main variables investigated
were as follows: relative density, displacement of the elevation or settlement zone,
elevated zone size, height of soil cover and pipe diameter/thickness ratio. The
simulations were performed in two stages. The first stage was involved the validation
of the numerical analysis using the physical models put forward by Costa (2005). In
the second stage, numerical analyzes of a full-scale pipeline subjected to a localized
elevation were performed. The obtained results allowed a detailed evaluation of the
redistribution of stresses in the soil mass and the deflections along the pipe. It was
observed the reduction of stresses in the soil mass and pipe deflections when the
height of soil cover was decreased on regions of the pipe subjected to elevation. It
was also shown for the analyzed situation that longitudinal thrusts were higher than
vi
circumferential trusts and exceeded the allowable stresses and deflections.
Furthermore, the benefits of minimizing stress with technical as the false trench,
compressible cradle and a combination of both applied to the simulated pipeline were
verified |
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