• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Master's Dissertation
DOI
10.11606/D.3.2006.tde-19092006-170548
Document
Author
Full name
Wanderley Camargo Russo Junior
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2006
Supervisor
Committee
Nader, José Jorge (President)
Barros, José Maria de Camargo
Pinto, Carlos de Sousa
Title in Portuguese
Desenvolvimento de um modelo hipoplástico que represente efeitos do sobreadensamento.
Keywords in Portuguese
Argilas
Hipoplasticidade
Modelo constitutivo
Sobreadensamento
Abstract in Portuguese
São propostas modificações em um modelo hipoplástico buscando representar o comportamento mecânico de argilas sobreadensadas. São introduzidos no modelo a razão de sobreadensamento, o intercepto de coesão e índices que representam características do trecho sobreadensado, resultando em parâmetros com claro sentido físico e de fácil determinação. A equação constitutiva é então calibrada com parâmetros de solos sobreadensados e a capacidade dos modelos de representar o comportamento de dois solos em particular é verificada, confrontando as previsões teóricas com resultados experimentais em diversas situações de carregamento e para uma larga faixa de razões de sobreadensamento. Verifica-se que as modificações introduzidas no modelo hipoplástico contemplam avanços significativos na representação dos efeitos do sobreadensamento, como a curvatura da envoltória de resistência no trecho sobreadensado, o aumento do módulo de deformabilidade com o grau de sobreadensamento, diferente rigidez no carregamento e no recarregamento, o aumento das tensões desviadoras de ruptura em solos sobreadensados, a diminuição da tendência à contração volumétrica com o aumento da razão de sobreadensamento, chegando à expansão volumétrica, e, nas solicitações não-drenadas, pressão neutra negativa quando o solo encontra-se fortemente sobreadensado.
Title in English
Development of a hypoplastic model that represents overconsolidation effects.
Keywords in English
Clays
Constitutive model
Hypoplasticity
Overconsolidation
Abstract in English
Modifications in a hypoplastic model are proposed intending to represent the mechanical behavior of overconsolidated clays. The overconsolidation ratio, the cohesion intercept and indices that represent overconsolidation characteristics are introduced in the model, resulting in parameters with a clear physical meaning and of easy to determine. The constitutive equation is then calibrated with parameters of overconsolidated soils and the capacity of the models of representing the behavior of two soils in particular is checked, confronting the theoretical predictions with experimental results in several loading situations and in a wide overconsolidation ratio range. It is verified that the modifications introduced into hypoplastic model contemplates significant advances in the representation of the effects of overconsolidation, like the curvature of the strength envelope in the overconsolidation region, the increase of the deformability modulus with the overconsolitadion ratio, different stiffness in loading and reloading, the increase of the deviator stress at failure in overconsolidated soils, presenting peak deviator stress, a decrease of the tendency to volumetric contraction with the increase of the overconsolidation ratio, including to the volumetric expansion, and, in undrained tests, negative pore pressure when the soil is heavily overconsolidated.
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
DissertacaoRusso.pdf (1.22 Mbytes)
Publishing Date
2006-11-17
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
Centro de Informática de São Carlos
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2020. All rights reserved.