Documents disponibles écrits par cet auteur

Depth integrated modelling of fast landslide propagation / Thomas Blanc in European journal of environmental and civil engineering, Vol. 15 N° Spécial (Septembre 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° Spécial (Septembre 2011) . - pp. 51-72 Titre : Depth integrated modelling of fast landslide propagation Titre original : Un modèle intégré en profondeur pour la propagation des glissements de terrains rapides Type de document : texte imprimé Auteurs : Thomas Blanc, Auteur ; Manuel Pastor, Auteur ; Mila Sanchez, Auteur Année de publication : 2012 Article en page(s) : pp. 51-72 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Landslide  Propagation  Depth  integrated  equations  SPH  Bingham  fluids  Cohesive-frictional  fluid Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper deals with a simple yet effective model which can be used for prediction of propagation of fast catastrophic landslides. The main ingredients are: i) a hierarchical set of mathematical models describing the coupled behaviour between solid skeleton and pore fluids. Here we will arrive to a coupled depth integrated model; ii) a rheological model describing the behaviour of the fluidized soil; iii) a numerical model to discretize mathematical and rheological models. The model performance has been assessed using a set of benchmark tests, including some provided by the Hong Kong Geotechnical Engineering Office. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16586 [article] Depth integrated modelling of fast landslide propagation = Un modèle intégré en profondeur pour la propagation des glissements de terrains rapides [texte imprimé] / Thomas Blanc, Auteur ; Manuel Pastor, Auteur ; Mila Sanchez, Auteur . - 2012 . - pp. 51-72. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° Spécial (Septembre 2011) . - pp. 51-72 Mots-clés : Landslide  Propagation  Depth  integrated  equations  SPH  Bingham  fluids  Cohesive-frictional  fluid Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper deals with a simple yet effective model which can be used for prediction of propagation of fast catastrophic landslides. The main ingredients are: i) a hierarchical set of mathematical models describing the coupled behaviour between solid skeleton and pore fluids. Here we will arrive to a coupled depth integrated model; ii) a rheological model describing the behaviour of the fluidized soil; iii) a numerical model to discretize mathematical and rheological models. The model performance has been assessed using a set of benchmark tests, including some provided by the Hong Kong Geotechnical Engineering Office. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16586

Modeling of rainfall-induced shallow landslides of the flow-type / Leonardo Cascini in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 1 (Janvier 2010) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 1 (Janvier 2010) . - pp. 85-98 Titre : Modeling of rainfall-induced shallow landslides of the flow-type Type de document : texte imprimé Auteurs : Leonardo Cascini, Auteur ; Sabatino Cuomo, Auteur ; Manuel Pastor, Auteur Article en page(s) : pp. 85-98 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Shallow  landslides  Flow-type  Rainfall  infiltration  Spring  Bedrock  Modeling Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : The paper deals with the modeling of failure and postfailure stage of shallow landslides of the flow-type that often affect natural shallow deposits of colluvial, weathered, and pyroclastic origin. The failure stage is frequently associated to rainfall that directly infiltrates the slope surface and to spring from the underlying bedrock. The postfailure stage is characterized by the sudden acceleration of the failed mass. The geomechanical modeling of both stages, based on site conditions and soil mechanical behavior, represents a fundamental issue to properly assess the failure conditions and recognize the potential for long travel distances of the failed soil masses. To this aim, in this paper, the current literature on the failure and postfailure stages of the shallow landslides of the flow-type is first reviewed. Then, an approach for their geomechanical modeling is proposed and three different modeling alternatives are presented. These models are then used to analyze, at different scales, a relevant case study of Southern Italy (Sarno-Quindici event, May 4–5, 1998). Numerical analyses outline that both site conditions and hydraulic boundary conditions are among the key factors to evaluate the reliability of landslides of the flow-type. The potentialities and limitations of the available models are also evidenced as well as the perspectives related to the use of more advanced numerical models. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JGGEFK&smode=strres [...] [article] Modeling of rainfall-induced shallow landslides of the flow-type [texte imprimé] / Leonardo Cascini, Auteur ; Sabatino Cuomo, Auteur ; Manuel Pastor, Auteur . - pp. 85-98. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 1 (Janvier 2010) . - pp. 85-98 Mots-clés : Shallow  landslides  Flow-type  Rainfall  infiltration  Spring  Bedrock  Modeling Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : The paper deals with the modeling of failure and postfailure stage of shallow landslides of the flow-type that often affect natural shallow deposits of colluvial, weathered, and pyroclastic origin. The failure stage is frequently associated to rainfall that directly infiltrates the slope surface and to spring from the underlying bedrock. The postfailure stage is characterized by the sudden acceleration of the failed mass. The geomechanical modeling of both stages, based on site conditions and soil mechanical behavior, represents a fundamental issue to properly assess the failure conditions and recognize the potential for long travel distances of the failed soil masses. To this aim, in this paper, the current literature on the failure and postfailure stages of the shallow landslides of the flow-type is first reviewed. Then, an approach for their geomechanical modeling is proposed and three different modeling alternatives are presented. These models are then used to analyze, at different scales, a relevant case study of Southern Italy (Sarno-Quindici event, May 4–5, 1998). Numerical analyses outline that both site conditions and hydraulic boundary conditions are among the key factors to evaluate the reliability of landslides of the flow-type. The potentialities and limitations of the available models are also evidenced as well as the perspectives related to the use of more advanced numerical models. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.aip.org/vsearch/servlet/VerityServlet?KEY=JGGEFK&smode=strres [...]

Towards SPH modelling of failure problems in geomechanics / Thomas Blanc in European journal of environmental and civil engineering, Vol. 15 N° Spécial (Septembre 2011) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 15 N° Spécial (Septembre 2011) . - pp. 31-49 Titre : Towards SPH modelling of failure problems in geomechanics : A fractional step Taylor-SPH model Titre original : Vers une approximation SPH des problèmes de rupture en géomécanique : un modèle de pas fractionnel du type Taylor-SPH Type de document : texte imprimé Auteurs : Thomas Blanc, Auteur ; Manuel Pastor, Auteur Année de publication : 2012 Article en page(s) : pp. 31-49 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Dynamics  Localization  Fractional  step  Runge-Kutta  Taylor-SPH  Viscoplasticity  Coupled  problems Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Failure of geomaterials with pores filled with fluids is an important research area in both civil and geological engineering. Many Finite Element (FE) formulations for coupled problems present difficulties such as overestimating failure loads, or mesh alignment dependence resulting on spurious failure mechanisms. Moreover, the spaces where field variables are approximated have to fulfill additional requirements ensuring stability. Stressvelocity-pore pressure formulations in FE analysis provide accurate results for wave propagation and failure analysis. However, FE present important limitations when deformations are large. The purpose of this paper is to present a stabilized Fractional Step, SPH algorithm which combines the advantages of the SPH method for large deformation problems with those of the Taylor-Galerkin algorithm used within the FE framework. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16585 [article] Towards SPH modelling of failure problems in geomechanics = Vers une approximation SPH des problèmes de rupture en géomécanique : un modèle de pas fractionnel du type Taylor-SPH : A fractional step Taylor-SPH model [texte imprimé] / Thomas Blanc, Auteur ; Manuel Pastor, Auteur . - 2012 . - pp. 31-49. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 15 N° Spécial (Septembre 2011) . - pp. 31-49 Mots-clés : Dynamics  Localization  Fractional  step  Runge-Kutta  Taylor-SPH  Viscoplasticity  Coupled  problems Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Failure of geomaterials with pores filled with fluids is an important research area in both civil and geological engineering. Many Finite Element (FE) formulations for coupled problems present difficulties such as overestimating failure loads, or mesh alignment dependence resulting on spurious failure mechanisms. Moreover, the spaces where field variables are approximated have to fulfill additional requirements ensuring stability. Stressvelocity-pore pressure formulations in FE analysis provide accurate results for wave propagation and failure analysis. However, FE present important limitations when deformations are large. The purpose of this paper is to present a stabilized Fractional Step, SPH algorithm which combines the advantages of the SPH method for large deformation problems with those of the Taylor-Galerkin algorithm used within the FE framework. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/article.jsp?articleId=16585