Catalogue en ligne Bibliothèque de l'Ecole Nationale Polytechnique

Les Inscriptions et les Réinscriptions à la Bibliothèque sont Ouvertes du 24/09/2024 au 30/11/2024

Nouvelle recherche Modifier la recherche Historique

Nos Abonnements

Ressources Électroniques

Validation of a new 2D failure mechanism for the stability analysis of a pressurized tunnel face in a spatially varying sand / Guilhem Mollon in Journal of engineering mechanics, Vol. 137 N° 1 (Janvier 2011)

Validation of a new 2D failure mechanism for the stability analysis of a pressurized tunnel face in a spatially varying sand [texte imprimé] / Guilhem Mollon, Auteur ; Phoon, Kok-Kwang, Auteur ; Daniel Dias, Auteur . - 2011 . - pp.8-21.
Mécanique appliquée
Langues : Anglais (eng)
in Journal of engineering mechanics > Vol. 137 N° 1 (Janvier 2011) . - pp.8-21
Mots-clés : Tunnels Limit analysis Failures Shear strength Parameters.
Résumé : A new two-dimensional (2D) limit analysis failure mechanism is presented for the determination of the critical collapse pressure of a pressurized tunnel face in the case of a soil exhibiting spatial variability in its shear strength parameters. The proposed failure mechanism is a rotational rigid block mechanism. It is constructed in such a manner to respect the normality condition of the limit analysis theory at every point of the velocity discontinuity surfaces taking into account the spatial variation of the soil angle of internal friction. Thus, the slip surfaces of the failure mechanism are not described by standard curves such as log-spirals. Indeed, they are determined point by point using a spatial discretization technique. Though the proposed mechanism is able to deal with frictional and cohesive soils, the present paper only focuses on sands. The mathematical formulation used for the generation of the failure mechanism is first detailed. The proposed kinematical approach is then presented and validated by comparison with numerical simulations. The present failure mechanism was shown to give results (in terms of critical collapse pressure and shape of the collapse mechanism) that compare reasonably well with the numerical simulations at a significantly cheaper computational cost.
DEWEY : 620.1
ISSN : 0733-9399
En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i1/p8_s1?isAuthorized=no

Les Inscriptions et les Réinscriptions à la Bibliothèque sont Ouvertes du 24/09/2024 au 30/11/2024

Nos Abonnements

Ressources Électroniques

Bibliothèque de l'Ecole Nationale Polytechnique

Accueil

Sélection de la langue

Se connecter

Adresse

Météo

Mots-clés :	Tunnels Limit analysis Failures Shear strength Parameters.
Résumé :	A new two-dimensional (2D) limit analysis failure mechanism is presented for the determination of the critical collapse pressure of a pressurized tunnel face in the case of a soil exhibiting spatial variability in its shear strength parameters. The proposed failure mechanism is a rotational rigid block mechanism. It is constructed in such a manner to respect the normality condition of the limit analysis theory at every point of the velocity discontinuity surfaces taking into account the spatial variation of the soil angle of internal friction. Thus, the slip surfaces of the failure mechanism are not described by standard curves such as log-spirals. Indeed, they are determined point by point using a spatial discretization technique. Though the proposed mechanism is able to deal with frictional and cohesive soils, the present paper only focuses on sands. The mathematical formulation used for the generation of the failure mechanism is first detailed. The proposed kinematical approach is then presented and validated by comparison with numerical simulations. The present failure mechanism was shown to give results (in terms of critical collapse pressure and shape of the collapse mechanism) that compare reasonably well with the numerical simulations at a significantly cheaper computational cost.
DEWEY :	620.1
ISSN :	0733-9399
En ligne :	http://ascelibrary.org/emo/resource/1/jenmdt/v137/i1/p8_s1?isAuthorized=no