DOI
https://doi.org/10.11606/D.3.2005.tde-23112005-100413
Documento
Autor
Nome completo
Hélio Mazzilli Xavier de Mendonça
E-mail
Área do Conhecimento
Data de Defesa
Imprenta
São Paulo, 2005
Bucalem, Miguel Luiz (Presidente)
Hachich, Waldemar Coelho
Negro Junior, Arsenio
Título em português
Sobre a modelagem de problemas da engenharia geotécnica pelo método dos elementos finitos.
Palavras-chave em português
geotecnica
método dos elementos finitos
modelagem matemática
solos
Resumo em português
Título em inglês
about geotechnical engineering mModelling using finite element method.
Palavras-chave em inglês
finite element
geotechnical engineering
soil
Resumo em inglês
Traditionally, the solution of Geotechnical Engineering problems was supported by Soil Mechanics concepts, developed by Terzaghi, Elasticity Theory and the limit analysis theories. This work tries to explore an unusual approach, which concerns the use of complete constitutive models for soils description. Both theoretical and practical aspects of the theme are discussed, with special attention devoted to the Finite Element implementation and development. Following a brief discussion about soil characteristics, the constitutive models usually used on Geotechnical Engineering are presented. In particular, the Mohr-Coulomb and Cam-clay models are explored in details. The theoretical presentation is concluded by establishing the Biot equations for consolidation problems, observing its using on a finite element program, ADINA for instance. On the second part of the work, three studies are carried out. The first one tries to compare the triaxial response of a silty soil when subjected to different stress paths, described by Nader (1993), with the results achieved when the Mohr-Coulomb and the modified Cam-clay models are used, showing the main differences. After that, computations of the bearing-capacity factor N have been made in order to evaluate the bearing-capacity for strip foundations. On this study, also solved in ADINA, the Mohr-Coulomb model is used, and the friction angle (), dilation angle () and footing roughness effects on the response are investigated. It is also discussed the numerical difficulties observed when non-associative conditions are applied. Finally, the retaining wall problem is explored. The evolution aspect of the problem, the consolidation study and the pre-excavation earth pressure coefficient (Ko) effects are also discussed. On this case, the modified Cam-clay model is chosen for several analyses. From these three studies it was noticed that in order to reproduce satisfactorily soil response, it is fundamental to chose representative constitutive models of soil behaviour. Also, this work accomplished the aim of confirming ADINA as an efficient skill to relevant Geotechnical Engineering problems solution.

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Data de Publicação
2005-12-01

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