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European journal of environmental and civil engineering |
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Ajouter le résultat dans votre panierTransport in porous media / Patrick Selvadurai in European journal of environmental and civil engineering, Vol. 14 N° 8-9 (Septembre 2010)
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 949-987
Titre : Transport in porous media : Application of mathematical methods Type de document : texte imprimé Auteurs : Patrick Selvadurai, Auteur Année de publication : 2011 Article en page(s) : pp. 949-987 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Advective transport Analytical solutions Contaminant transport Hyperbolic partial differential equations Time-dependent boundary fluxes Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The paper describes the application of mathematical procedures to the solution of certain initial boundary value problems that deal with the advective and advective-diffusive transport of chemicals and contaminants in fluid saturated porous media. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Transport in porous media : Application of mathematical methods [texte imprimé] / Patrick Selvadurai, Auteur . - 2011 . - pp. 949-987.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 949-987
Mots-clés : Advective transport Analytical solutions Contaminant transport Hyperbolic partial differential equations Time-dependent boundary fluxes Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The paper describes the application of mathematical procedures to the solution of certain initial boundary value problems that deal with the advective and advective-diffusive transport of chemicals and contaminants in fluid saturated porous media. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 989-1009
Titre : Bifurcation theory and localization phenomena Type de document : texte imprimé Auteurs : Jean Sulem, Auteur Année de publication : 2011 Article en page(s) : pp. 989-1009 Langues : Anglais (eng) Mots-clés : Strain localization Bifurcation Constitutive models Fluid Temperature Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The principles of strain localization analysis as applied to geomaterials are presented. Emphasis is given to the effects of fluid and temperature in the occurrence and development of instabilities. Note de contenu : Génie Civil DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Bifurcation theory and localization phenomena [texte imprimé] / Jean Sulem, Auteur . - 2011 . - pp. 989-1009.
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 989-1009
Mots-clés : Strain localization Bifurcation Constitutive models Fluid Temperature Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The principles of strain localization analysis as applied to geomaterials are presented. Emphasis is given to the effects of fluid and temperature in the occurrence and development of instabilities. Note de contenu : Génie Civil DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1011-1029
Titre : Continua with microstructure : Cosserat theory Type de document : texte imprimé Auteurs : Euripides Papamichos, Auteur Année de publication : 2011 Article en page(s) : pp. 1011-1029 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cosserat continuum Microstructure Couple stress Internal length Elastoplasticity Timoshenko beam Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A brief description of the Cosserat continuum theory is presented. In the Introduction the history of the evolution of the theory is presented followed with some examples where the differences between the classical and Cosserat continua are more evident and the main areas of application. The formulation of the Cosserat continuum is then presented followed with the description and the equations of Cosserat elastoplasticity. Particular expressions are given for Mohr-Coulomb non-associative elastoplasticity. Finally and example of a simple Cosserat elastic problem that of a Timoshenko beam is presented to demonstrate the effects of the theory on the bending rigidity of a beam. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Continua with microstructure : Cosserat theory [texte imprimé] / Euripides Papamichos, Auteur . - 2011 . - pp. 1011-1029.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1011-1029
Mots-clés : Cosserat continuum Microstructure Couple stress Internal length Elastoplasticity Timoshenko beam Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A brief description of the Cosserat continuum theory is presented. In the Introduction the history of the evolution of the theory is presented followed with some examples where the differences between the classical and Cosserat continua are more evident and the main areas of application. The formulation of the Cosserat continuum is then presented followed with the description and the equations of Cosserat elastoplasticity. Particular expressions are given for Mohr-Coulomb non-associative elastoplasticity. Finally and example of a simple Cosserat elastic problem that of a Timoshenko beam is presented to demonstrate the effects of the theory on the bending rigidity of a beam. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1031-1050
Titre : Continua with microstructure : Second-gradient theory: Theory, examples and computational issues Type de document : texte imprimé Auteurs : Stefanos-Aldo Papanicolopulos, Auteur ; Antonis Zervos, Auteur Année de publication : 2011 Article en page(s) : pp. 1031-1050 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Second-gradient theories Gradient elasticity Microstructure Finite elements Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Second-gradient theories represent a frequently used subset of theories of continua with microstructure. This paper presents an extended overview of second-gradient theories, starting from a simple one-dimensional example, proceeding with a thorough description of gradient elasticity and additionally briefly describing some other theories of this kind. A series of characteristic examples is presented to demonstrate the main aspects and applications of second-gradient theories. Finally, the complications in the finite-element implementation of second-gradient theories are presented, along with a review of the finite elements that have been developed for this purpose. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Continua with microstructure : Second-gradient theory: Theory, examples and computational issues [texte imprimé] / Stefanos-Aldo Papanicolopulos, Auteur ; Antonis Zervos, Auteur . - 2011 . - pp. 1031-1050.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1031-1050
Mots-clés : Second-gradient theories Gradient elasticity Microstructure Finite elements Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Second-gradient theories represent a frequently used subset of theories of continua with microstructure. This paper presents an extended overview of second-gradient theories, starting from a simple one-dimensional example, proceeding with a thorough description of gradient elasticity and additionally briefly describing some other theories of this kind. A series of characteristic examples is presented to demonstrate the main aspects and applications of second-gradient theories. Finally, the complications in the finite-element implementation of second-gradient theories are presented, along with a review of the finite elements that have been developed for this purpose. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1051-1065
Titre : Computational post failure analysis with Cosserat continuum Type de document : texte imprimé Auteurs : Panos Papanastasiou, Auteur Année de publication : 2011 Article en page(s) : pp. 1051-1065 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cosserat model Plasticity theory Finite elements Stability Bifurcation Localization of deformation Scale effect Borehole Perforations Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : We present computational analysis of geomechanics problems in the post failure regime based on a Cosserat material model The introduction of internal length (related to grain size) in the Cosserat model improves the computational stability and allows for robust progressive localization modelling. The model is capable of predicting advanced deformation modes such as surface buckling and localization of deformation in shear bands that may cause failure in a structure. The obtained results show clearly a progressive failure mechanism and the computed modes are in a good qualitative agreement with laboratory and field observations. As illustration we present results of two applications from petroleum engineering: the modelling of failure in thick walled cylinder test and the stability of elliptical shape perforations. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Computational post failure analysis with Cosserat continuum [texte imprimé] / Panos Papanastasiou, Auteur . - 2011 . - pp. 1051-1065.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1051-1065
Mots-clés : Cosserat model Plasticity theory Finite elements Stability Bifurcation Localization of deformation Scale effect Borehole Perforations Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : We present computational analysis of geomechanics problems in the post failure regime based on a Cosserat material model The introduction of internal length (related to grain size) in the Cosserat model improves the computational stability and allows for robust progressive localization modelling. The model is capable of predicting advanced deformation modes such as surface buckling and localization of deformation in shear bands that may cause failure in a structure. The obtained results show clearly a progressive failure mechanism and the computed modes are in a good qualitative agreement with laboratory and field observations. As illustration we present results of two applications from petroleum engineering: the modelling of failure in thick walled cylinder test and the stability of elliptical shape perforations. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1067-1079
Titre : Computational post failure analysis with a second gradient theory : Gradient elastoplasticity Type de document : texte imprimé Auteurs : Antonis Zervos, Auteur ; Panos Papanastasiou, Auteur Année de publication : 2011 Article en page(s) : pp. 1067-1079 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Gradient plasticity Gradient elastoplasticity Post-bifurcation modelling Finite elements Numerical modelling Microstructure Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This article presents a theory of Gradient Elastoplasticity for strain-softening materials, in which internal length scales are present in both the elastic and the elastoplastic regime. A numerical discretisation based on the displacement formulation and a C1 finite element is used. It is shown that the formulation enables robust modelling of the post-peak material behaviour leading to localisation of deformation, spontaneously tracking emergent instabilities and quantitatively capturing details of the final localised failure mechanism. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Computational post failure analysis with a second gradient theory : Gradient elastoplasticity [texte imprimé] / Antonis Zervos, Auteur ; Panos Papanastasiou, Auteur . - 2011 . - pp. 1067-1079.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1067-1079
Mots-clés : Gradient plasticity Gradient elastoplasticity Post-bifurcation modelling Finite elements Numerical modelling Microstructure Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This article presents a theory of Gradient Elastoplasticity for strain-softening materials, in which internal length scales are present in both the elastic and the elastoplastic regime. A numerical discretisation based on the displacement formulation and a C1 finite element is used. It is shown that the formulation enables robust modelling of the post-peak material behaviour leading to localisation of deformation, spontaneously tracking emergent instabilities and quantitatively capturing details of the final localised failure mechanism. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1081-1090
Titre : A new method to solve crack problems based on gradient elasticity Type de document : texte imprimé Auteurs : George Exadaktylos, Auteur Année de publication : 2011 Article en page(s) : pp. 1081-1090 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Displacement discontinuity Strain-gradient elasticity Crack problems Stress intensity factors Half-plane Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A new constant displacement discontinuity method is presented for the numerical solution of cracks of the three fundamental deformation modes I, II and III lying either in the plane or in the half-plane. This method is based on the strain-gradient elasticity theory in its simplest possible Grade-2 (G2) variant for the solution of classical crack problems. The assumption of the G2 expression for the stresses results to a more accurate average stress value at the mid-point of the straight displacement discontinuity since it takes into account the stress-gradient effect and gives considerably better predictions of the stress intensity factors compared to the compared to the classical elasticity solution. Moreover, the proposed method preserves the simplicity and hence the high speed of computations. For brevity of this paper we present here the specific case of mode-II cracks perpendicular to the free-surface of the half-plane. Validation of the method is made against analytical solution. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] A new method to solve crack problems based on gradient elasticity [texte imprimé] / George Exadaktylos, Auteur . - 2011 . - pp. 1081-1090.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1081-1090
Mots-clés : Displacement discontinuity Strain-gradient elasticity Crack problems Stress intensity factors Half-plane Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A new constant displacement discontinuity method is presented for the numerical solution of cracks of the three fundamental deformation modes I, II and III lying either in the plane or in the half-plane. This method is based on the strain-gradient elasticity theory in its simplest possible Grade-2 (G2) variant for the solution of classical crack problems. The assumption of the G2 expression for the stresses results to a more accurate average stress value at the mid-point of the straight displacement discontinuity since it takes into account the stress-gradient effect and gives considerably better predictions of the stress intensity factors compared to the compared to the classical elasticity solution. Moreover, the proposed method preserves the simplicity and hence the high speed of computations. For brevity of this paper we present here the specific case of mode-II cracks perpendicular to the free-surface of the half-plane. Validation of the method is made against analytical solution. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1091-1111
Titre : Experimental geomechanics : A review on the classical triaxial apparatus: limitations and improvements Type de document : texte imprimé Auteurs : Ioannis-Orestis S. Georgopoulos, Auteur Année de publication : 2011 Article en page(s) : pp. 1091-1111 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Triaxial Modifications Stress Strain Pressure Eccentricity Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : In the fields of experimental geomechanics, the classical or typical triaxial apparatus is one of the most widely used testing equipments for the estimation of the material parameters. The testing procedure is rather simple and the basic principles of the apparatus are easy to understand. In situ stress states can be (re-) applied to the specimen in a rather simple and effective way. The stresses and/or strains, imposed to the specimen, are also precisely controlled and monitored. However, the experimentalist should always keep in mind the limitations of the apparatus, imposed by its design. In this paper, a critical discussion on the limitations of the classical or typical triaxial apparatus is presented. Modifications of the initial design are suggested in order to overcome such limitations and improve measuring techniques. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Experimental geomechanics : A review on the classical triaxial apparatus: limitations and improvements [texte imprimé] / Ioannis-Orestis S. Georgopoulos, Auteur . - 2011 . - pp. 1091-1111.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1091-1111
Mots-clés : Triaxial Modifications Stress Strain Pressure Eccentricity Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : In the fields of experimental geomechanics, the classical or typical triaxial apparatus is one of the most widely used testing equipments for the estimation of the material parameters. The testing procedure is rather simple and the basic principles of the apparatus are easy to understand. In situ stress states can be (re-) applied to the specimen in a rather simple and effective way. The stresses and/or strains, imposed to the specimen, are also precisely controlled and monitored. However, the experimentalist should always keep in mind the limitations of the apparatus, imposed by its design. In this paper, a critical discussion on the limitations of the classical or typical triaxial apparatus is presented. Modifications of the initial design are suggested in order to overcome such limitations and improve measuring techniques. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1113-1128
Titre : A model of liquefaction of granular materials in isotropic compression Type de document : texte imprimé Auteurs : Maria Stavropoulou, Auteur Année de publication : 2011 Article en page(s) : pp. 1113-1128 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Liquefaction Sand Isotropic compression Mixtures theory Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : An elastoplastic continuum model is developed for the investigation of the susceptibility of almost saturated granular materials to liquefaction under undrained isotropic compression. The model was successfully validated against published experimental results on cyclic isotropic compression of sand. As both the experiments and model show, the most critical parameters affecting sand's susceptibility to liquefaction is its density and the initial confining pressure. DEWEY : 624 ISSN : 1113-1128 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] A model of liquefaction of granular materials in isotropic compression [texte imprimé] / Maria Stavropoulou, Auteur . - 2011 . - pp. 1113-1128.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1113-1128
Mots-clés : Liquefaction Sand Isotropic compression Mixtures theory Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : An elastoplastic continuum model is developed for the investigation of the susceptibility of almost saturated granular materials to liquefaction under undrained isotropic compression. The model was successfully validated against published experimental results on cyclic isotropic compression of sand. As both the experiments and model show, the most critical parameters affecting sand's susceptibility to liquefaction is its density and the initial confining pressure. DEWEY : 624 ISSN : 1113-1128 En ligne : http://ejece.revuesonline.com/resnum.jsp
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1129-1154
Titre : Erosion and multiphase flow in porous media : Application to sand production Type de document : texte imprimé Auteurs : Euripides Papamichos, Auteur Année de publication : 2011 Article en page(s) : pp. 1129-1154 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Borehole failure Erosion Sand production Two-phase flow Water breakthrough Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Experimental results from sand production hollow cylinders tests are presented for cavity failure and sand production quantification. The effects of important parameters such as the sandstone class, stress rate, fluid flow rate, and time are presented and show how they influence sand production. A model for hydro-mechanical erosion of porous rocks is presented as it is applied to the sand production problem in hydrocarbon production. The model is based on a continuum theory for erosion, which regards the continuum as a threephase medium and establishes a set of mass balance equations for the various phases. The solution requires an additional equation in the form of a constitutive or evolution law for the sand rate. Erosion is coupled with the mechanical behavior of a sand-producing cavity, and leads to enlargement of the erosion zone. Finally, multiphase flow and its effect on sand production is presented experimentally and theoretically by analyzing water invasion in the sand production test. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Erosion and multiphase flow in porous media : Application to sand production [texte imprimé] / Euripides Papamichos, Auteur . - 2011 . - pp. 1129-1154.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1129-1154
Mots-clés : Borehole failure Erosion Sand production Two-phase flow Water breakthrough Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Experimental results from sand production hollow cylinders tests are presented for cavity failure and sand production quantification. The effects of important parameters such as the sandstone class, stress rate, fluid flow rate, and time are presented and show how they influence sand production. A model for hydro-mechanical erosion of porous rocks is presented as it is applied to the sand production problem in hydrocarbon production. The model is based on a continuum theory for erosion, which regards the continuum as a threephase medium and establishes a set of mass balance equations for the various phases. The solution requires an additional equation in the form of a constitutive or evolution law for the sand rate. Erosion is coupled with the mechanical behavior of a sand-producing cavity, and leads to enlargement of the erosion zone. Finally, multiphase flow and its effect on sand production is presented experimentally and theoretically by analyzing water invasion in the sand production test. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1155-1166
Titre : Inverse problems in geomechanics : Review and examples Type de document : texte imprimé Auteurs : Emmanouil Vairaktaris, Auteur Année de publication : 2011 Article en page(s) : pp. 1155-1166 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Inverse problems Geomechanics Well-posed problem Back analysis Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : In engineering science, analysis of inverse problems is a rapidly growing discipline following computer evolution and developments in numerical methods. In geomechanics, numerous works are concerning parameter identification in contrast with boundary determination problems. Some review of inverse problems in geomechanics is presented in this work. Discussion on well-posedness of inverse problems is also presented here along with recent developments in the area. Finally, some examples will be discussed. Hybrid methods and interdisciplinary research can be considered in future works. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Inverse problems in geomechanics : Review and examples [texte imprimé] / Emmanouil Vairaktaris, Auteur . - 2011 . - pp. 1155-1166.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1155-1166
Mots-clés : Inverse problems Geomechanics Well-posed problem Back analysis Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : In engineering science, analysis of inverse problems is a rapidly growing discipline following computer evolution and developments in numerical methods. In geomechanics, numerous works are concerning parameter identification in contrast with boundary determination problems. Some review of inverse problems in geomechanics is presented in this work. Discussion on well-posedness of inverse problems is also presented here along with recent developments in the area. Finally, some examples will be discussed. Hybrid methods and interdisciplinary research can be considered in future works. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1167-1183
Titre : Stress tensors for granular materials as non simple continua Type de document : texte imprimé Auteurs : Francesco Froiio, Auteur ; Eleni Gerolymatou, Auteur Année de publication : 2011 Article en page(s) : pp. 1167-1183 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Granular materials Generalised continuum models Stress tensors Averaging Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : We discuss the microstructural origin of stress tensors for granular materials in the context of "non simple" continuum models, of the micropolar and of the second-gradient type. Stress tensors are looked upon as generalised forces in the sense of analytical mechanics and we derive expressions that provide estimates of these quantities on the base of forces and couples exchanged between the grains in a Representative Elementary Volume (REV). DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Stress tensors for granular materials as non simple continua [texte imprimé] / Francesco Froiio, Auteur ; Eleni Gerolymatou, Auteur . - 2011 . - pp. 1167-1183.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1167-1183
Mots-clés : Granular materials Generalised continuum models Stress tensors Averaging Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : We discuss the microstructural origin of stress tensors for granular materials in the context of "non simple" continuum models, of the micropolar and of the second-gradient type. Stress tensors are looked upon as generalised forces in the sense of analytical mechanics and we derive expressions that provide estimates of these quantities on the base of forces and couples exchanged between the grains in a Representative Elementary Volume (REV). DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1185-1198
Titre : Thermoporomechanics of landslides : A review of the Vaiont slide Type de document : texte imprimé Auteurs : Sotirios Alevizos, Auteur ; Eleni Gerolymatou, Auteur ; Emmanuil Veveakis, Auteur Année de publication : 2011 Article en page(s) : pp. 1185-1198 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Friction Landslides Irreversible thermodynamics Temperature Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The problem of creeping landslides accompanied by heat production due to friction on their base is studied here. The landslide is modelled using a rigid block that slides over a clayey zone of finite width and a thermal softening and velocity strengthening constitutive law for the friction coefficient of the basal clay material. As time progresses, the sliding process enters an irreversible, highly unstable procedure, when the heat dissipation at the base of the slide starts localizing towards an infinitesimally small shear band of the order of mm. The influence of this transition to the stability of the slide is explored by applying this model in the famous landslide of the Vaiont valley (Northern Italy). The model is calibrated upon the real velocity data of the slide verifying that the onset of the localization of dissipation is also a stability threshold for deep seated thermally driven landslides. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Thermoporomechanics of landslides : A review of the Vaiont slide [texte imprimé] / Sotirios Alevizos, Auteur ; Eleni Gerolymatou, Auteur ; Emmanuil Veveakis, Auteur . - 2011 . - pp. 1185-1198.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1185-1198
Mots-clés : Friction Landslides Irreversible thermodynamics Temperature Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The problem of creeping landslides accompanied by heat production due to friction on their base is studied here. The landslide is modelled using a rigid block that slides over a clayey zone of finite width and a thermal softening and velocity strengthening constitutive law for the friction coefficient of the basal clay material. As time progresses, the sliding process enters an irreversible, highly unstable procedure, when the heat dissipation at the base of the slide starts localizing towards an infinitesimally small shear band of the order of mm. The influence of this transition to the stability of the slide is explored by applying this model in the famous landslide of the Vaiont valley (Northern Italy). The model is calibrated upon the real velocity data of the slide verifying that the onset of the localization of dissipation is also a stability threshold for deep seated thermally driven landslides. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1199-1217
Titre : Continuum modeling of discontinuous rock structures : Homogenization of discrete particle assemblies Type de document : texte imprimé Auteurs : Ioannis Stefanou, Auteur ; Jean Sulem, Auteur Année de publication : 2011 Article en page(s) : pp. 1199-1217 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cosserat continuum Micromorphic continuum Homogenization Rock joints Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A continuum model for discontinuous rock masses is presented here. The discrete system is formed by three joint sets of arbitrary geometrical and mechanical properties. In the general case the joint blocks are parallelepipeds that interact through their interfaces transferring both forces and torques. For geometrical reasons the inertia tensor of the blocks is not isotropic and the bending at the interfaces is non-symmetric. The derived continuum is an anisotropic three dimensional Cosserat continuum, which approximates the discrete system for wavelengths five times bigger the characteristic length of the typical rock block. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Continuum modeling of discontinuous rock structures : Homogenization of discrete particle assemblies [texte imprimé] / Ioannis Stefanou, Auteur ; Jean Sulem, Auteur . - 2011 . - pp. 1199-1217.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 14 N° 8-9 (Septembre 2010) . - pp. 1199-1217
Mots-clés : Cosserat continuum Micromorphic continuum Homogenization Rock joints Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A continuum model for discontinuous rock masses is presented here. The discrete system is formed by three joint sets of arbitrary geometrical and mechanical properties. In the general case the joint blocks are parallelepipeds that interact through their interfaces transferring both forces and torques. For geometrical reasons the inertia tensor of the blocks is not isotropic and the bending at the interfaces is non-symmetric. The derived continuum is an anisotropic three dimensional Cosserat continuum, which approximates the discrete system for wavelengths five times bigger the characteristic length of the typical rock block. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp
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