Settlement analysis of piled-raft foundations by means of a multiphase model accounting for soil-pile interactions

Bourgeois, Emmanuel; Buhan, Patrick de; Hassen, Ghazi

doi:10.1016/j.compgeo.2012.05.015

Cited by 41 publications

(22 citation statements)

References 19 publications

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“…According to this model, a detailed presentation of which can be found in Sudret and de Buhan [23], de Buhan et al [4] and quite recently Bourgeois et al [2,3], the composite reinforced soil is schematized as a two-phase system that is as the superposition of two continuous media, called matrix and reinforcement phases, the kinematics of each phase being characterized by a displacement field: n m for the matrix and n r for the reinforcement (Fig. 8).…”

Section: A Generalization Of the Homogenization Approach: The Multiphmentioning

confidence: 99%

“…Pointing out the limitations of such a homogenization procedure, which tends to overestimate the foundation dynamic stiffness, a multiphase model, already successfully developed for piled raft foundations under static loading conditions [2], is presented in Section 5 in the context of a linear elastic dynamic behavior. It is characterized by the introduction of two soil-pile interaction stiffness parameters which can be easily identified from the solution of a static auxiliary problem (Section 6).…”

Section: Introductionmentioning

confidence: 99%

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Assessing the dynamic stiffness of piled-raft foundations by means of a multiphase model

Nguyen

Hassen

Buhan

2016

Computers and Geotechnics

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Section: A Generalization Of the Homogenization Approach: The Multiphmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessing the dynamic stiffness of piled-raft foundations by means of a multiphase model

Nguyen

Hassen

Buhan

2016

Computers and Geotechnics

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“…The developments [6] of the numerical methods in the latter years and its versatility made them attractive to many researchers. The finite element method (FEM) is still popular [5,16], however has some disadvantages when compared to other options such as the boundary element method (BEM). The FEM require the discretization of the domain, which has to be simulated as infinite in most soilstructure interaction problems.…”

Section: Introductionmentioning

confidence: 99%

Study of Soil-Structure Interaction Problems Using Mixed FEM-BEM Formulations

Ribeiro¹,

Paiva

2015

Transactions on Engineering Technologies

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The objective of this paper is to present formulations developed for soilbuilding interaction analysis, including foundations. The soil is modeled with the boundary element method (BEM) as a layered solid which may be finite for the vertical direction, but is always infinite for radial directions. Infinite boundary elements are employed for the far field simulation, allowing computational cost reduction without compromising the result accuracy. Beams, columns and piles are modeled with the finite element method (FEM) using one dimensional elements. Slabs and rafts are also modeled with the FEM, but with two dimensional elements. The analysis is static and all materials are considered homogeneous, isotropic, elastic and with linear behavior.

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“…Methods of analyzing the behavior of piled rafts are complex because of the number of factors involved in the raft-soil-pile interaction (Bourgeois et al, 2012;Cho, Lee, Jeong, & Lee, 2012;Lee, Kim, & Jeong, 2010). The raft-soil contact effect can significantly influence the behavior of piled raft foundations.…”

Section: Introductionmentioning

confidence: 99%

“…A typical problem of geotechnical engineering that must be addressed is vertical loads applied to a mass of semi-infinite soil through a footing. To increase the load capacity, it is common to use the piled raft technique (Bourgeois, De Buhan, & Hassen, 2012).…”

Section: Introductionmentioning

confidence: 99%

<b>Influence of relative stiffness on the behavior of piled raft foundations

Garcia

Albuquerque

2018

Acta Sci. Technol.

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ABSTRACT. The behavior of piled foundations is influenced by several factors, especially those related to the geometry of the foundations, the number of piles, the height of the element that tops the piles and the type of soil in which the foundations are inserted. Given the various situations and variations of parameters to be analyzed, it is common to use numerical modeling for the analysis of geotechnical engineering problems. The piled rafts in this article are numerically analyzed by means of the three-dimensional finite element method using CESAR-LCPC ® v.5 software. Thus, it was possible to conduct various analyses of piled rafts by varying the amount of piles and the thickness of the raft supported on the soil and piles. The results demonstrate that piled raft foundations tend to make displacements uniform, thus minimizing problems with differential settlement in structures. The thickness of the plate of the piled raft influences the load distribution in the piles under the raft when the piles are supported on the ground. The relative stiffness (K rs ), which is the 'stiffness' of the piled raft combined with the soil, increases with increases in the amount of piles and the thickness of the piled raft.Keywords: piled raft; numerical analysis; piles; relative stiffness.Influência da rigidez relativa no comportamento de fundações em radier estaqueado RESUMO. As fundações estaqueadas tem seu comportamento influenciado por diversos fatores, principalmente àqueles relacionados à sua geometria, quantidade de estacas, altura do elemento que coroa as estacas e o tipo de solo onde está inserida. Diante das diversas situações e variações de parâmetros a serem analisados, é comum o emprego de modelagem numérica para análise dos problemas da engenharia geotécnica. Os radiers estaqueados deste artigo são analisados numericamente pelo método dos elementos finitos 3D com o software LCPC-Cesar ® versão 5.0. Neste sentido, foi possível realizar diversas análises de radiers estaqueados variando-se a quantidade de estacas e a espessura do radier apoiado sobre o solo e estacas. Os resultados demonstram que as fundações em radier estaqueado tendem a uniformizar os deslocamentos, podendo assim minimizar problemas com recalque diferencial em estruturas. A espessura da laje do radier estaqueado exerce influência na distribuição de carga nas estacas sob o radier, quando este está apoiado em solo. A rigidez relativa (k rs ), que representa a 'rigidez' do radier estaqueado juntamente com o solo se eleva com o aumento da quantidade de estacas e espessura do radier estaqueado.Palavras-chave: radier estaqueado; análise numérica; estacas; rigidez relativa.

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Settlement analysis of piled-raft foundations by means of a multiphase model accounting for soil-pile interactions

Cited by 41 publications

References 19 publications

Assessing the dynamic stiffness of piled-raft foundations by means of a multiphase model

Assessing the dynamic stiffness of piled-raft foundations by means of a multiphase model

Study of Soil-Structure Interaction Problems Using Mixed FEM-BEM Formulations

<b>Influence of relative stiffness on the behavior of piled raft foundations

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