Longitudinal variability of soils and structural response of sewer networks

Elachachi, Sidi Mohammed; Breysse, Denys; Houy, Laurent

doi:10.1016/j.compgeo.2004.10.003

Cited by 40 publications

(18 citation statements)

References 26 publications

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“…Different methods of calculation can be used to study soil-structure interaction. For example, the finite element method has been used in numerous studies: Imanzadeh et al (2014) and Dubost et al (2011) studied soil-foundation interaction, Elachachi et al (2004Elachachi et al ( , 2011Elachachi et al ( , 2012 studied soil-pipe interactions, and foundation settlements on spatially random soil have been studied by Houy et al (2005), Fenton and Griffiths (2002). However, in order to simplify the soil-structure interaction, analytical approaches can be used (Deck and Singh 2012;Imanzadeh et al 2013a).…”

Section: Soil-shallow Foundation Modelmentioning

confidence: 97%

“…Numerous expressions or semi-empirical models (about a dozen) are available to determine the subgrade reaction modulus k s as a function of the studied applications (Elachachi et al 2004; Sadrekarimi and Akbarzad 2009). Four semi-empirical models (Biot 1937;Vesic 1961;Leontiev 1960, 1966;Cassan 1978), commonly used in the design of spread footing, are considered in this study in order to obtain a value of the soil reaction modulus.…”

Section: Modulus Of Soil Reaction Different Expressionsmentioning

confidence: 99%

“…Different models are used for the study of soilstructure interaction on elastic soil such as Winkler's model (1867) with one parameter, Pasternak's (1954) and Vlassov's models (1966) with two parameters and Kerr's model (Kerr 1965;Morfidis 2007) with three parameters. The common parameter for these models is the modulus of soil reaction (k s ) which is obtained from different semi-empirical models Leontiev 1960, 1966;Elachachi et al 2004;Sadrekarimi and Akbarzad 2009;Biot 1937;Vesic 1961;Cassan 1978).…”

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confidence: 99%

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Settlement Uncertainty Analysis for Continuous Spread Footing on Elastic Soil

Imanzadeh¹,

Denis²,

Marache³

2014

Geotech Geol Eng

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In conventional design, continuous spread footings are always designed on the basis of their transverse behavior, where the natural variability of soil properties and any uncertainties in the geometrical and mechanical properties of the structure are usually not considered. In order to reveal the effects of these uncertainties and the soil variability on the behavior of spread footings, the longitudinal direction needed to be studied. Numerous mechanical models, which describe the soil-structure interaction as a beam on elastic foundation, were developed. The common parameter between these models is the subgrade reaction coefficient which depends on numerous parameters. In this paper, the FOSM method was used, first on four semi-empirical models which give the subgrade reaction coefficient, and secondly on the analytical solution of a beam from Winkler's hypothesis including different boundary conditions. Uncertainties in the subgrade reaction coefficient, differential settlement and bending moment were obtained for the following case: continuous wall footing in residential construction, where a low stiffness zone or shrinkage of clayey soil is possible. Results from a global uncertainty analysis demonstrated the major effects of uncertainties in soil modulus; Poisson's ratio and width of the spread footing on the uncertainty of the subgrade reaction coefficient, and thus on uncertainties of the differential settlement and bending moment. Finally, it was shown that when the soil modulus and geometrical dimensions of the foundations are uncertain and where a zone of weak soil or shrinkage of clayey soils are present, the longitudinal behavior of continuous spread footings for residential construction should also be considered in their design.

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Section: Soil-shallow Foundation Modelmentioning

confidence: 97%

Section: Modulus Of Soil Reaction Different Expressionsmentioning

confidence: 99%

mentioning

confidence: 99%

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Settlement Uncertainty Analysis for Continuous Spread Footing on Elastic Soil

Imanzadeh¹,

Denis²,

Marache³

2014

Geotech Geol Eng

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“…Alternative formulations were developed by Klopple & Glock [22][23][24], See Eq. (5) and Selvadurai [23,24], Eq.…”

Section: Background To Subgrade Reaction Theoriesmentioning

confidence: 99%

A comparison of initial stiffness formulations for small-strain soil–pile dynamic Winkler modelling

Prendergast

Gavin

2016

Soil Dynamics and Earthquake Engineering

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“…Il dépend d'autres facteurs tels que la charge appliquée, la géométrie de la fondation et sa rigidité ; il est d'autant plus élevé que la fondation est souple et le sol rigide. De nom breux auteurs en ont donné des expressions particulières, tels que Vlassov et Leontiev (1956), Vesic (1963), avec une synthèse dans Elachachi et al (2004).…”

Section: Le M Odèle De Calculunclassified

Influence du retrait et de la variabilité naturelle des sols argileux sur le comportement des fondations de maisons individuelles

Denis¹,

Elachachi²,

Niandou³

et al. 2007

Rev. Fr. Geotech.

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Les maisons individuelles sont particulièrement sensibles aux tassem ents différentiels provoqués par les phénom ènes de retrait-gonflement des sols argileux. La reconnaissance sur les sites de construction de la présence de sols argileux est donc primordiale. La méthode VLF-R (Very Low Frequency) en mode résistivité (R), testée sur un site de 25 000 m2, s'avère être un outil performant pour atteindre cet objectif mais égalem ent pour mettre en évidence la variabilité lithologique des sols sur un site. De telles informations sont ensuite utilisées dans un m odèle simple de comportement de semelle filante sur sol élastique (modèle de Winkler) développé en élém ents finis. Ce modèle permet d'évaluer l'amplitude des tassem ents différentiels et des moments fléchissants dans une semelle filante en fonction de la variabilité longitudinale des propriétés du sol et d'un retrait du sol sous la fondation. Il apparaît que la variabilité des propriétés mécaniques des sols, tout comme un retrait, entraînent des déplacements et des efforts internes dans la fondation qui peuvent être domm ageables pour la structure. This model is developed through a finite element model in which a 1D structure (wall footing) rests on a spatially varying soil described with Winkler-type springs. This model is used to study induced effects of soil variations (described by the means of a spatial correlation function), shrinkage, differential settlements and critical bending moment values that cannot be predicted if the soil is assumed homogeneous or shrinkage left out under the wall footing. These different results give some tracks to revise the wall foundation design accordingly.

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Longitudinal variability of soils and structural response of sewer networks

Cited by 40 publications

References 26 publications

Settlement Uncertainty Analysis for Continuous Spread Footing on Elastic Soil

Settlement Uncertainty Analysis for Continuous Spread Footing on Elastic Soil

A comparison of initial stiffness formulations for small-strain soil–pile dynamic Winkler modelling

Influence du retrait et de la variabilité naturelle des sols argileux sur le comportement des fondations de maisons individuelles

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