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Theses

Analyse de la stabilité des ouvrages souterrains par une méthode cinématique régularisée

Abstract : This thesis deals with the stability of shallow tunnels and underground openings constructed in soft soil. The stability of this kind of structure is usually analyzed by means of computational methods that have been validated by experience but are based on assumptions that are not fully consistent with the principles of mechanics. The limit analysis allows to provide upper and lower bounds of the rupture loads for any given mechanical system. This thesis describes the numerical implementation of a regularized approach of the kinematical method in limit analysis to the study of the stability of underground openings. The soil resistance is modeled by the Tresca, Tresca with tension cut-off and Mohr-Coulomb criteria for two-dimensional analyses and by the Tresca and Mohr-Coulomb criteria for the three-dimensional calculations. The calculations provide a reasonable picture of the failure mechanisms that are actually observed in nature and in small scale tests. The values calculated for the limit loads are close to those obtained experimentally.
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Armando Manuel Sequeira Nunes Antao. Analyse de la stabilité des ouvrages souterrains par une méthode cinématique régularisée. Matériaux. Ecole Nationale des Ponts et Chaussées, 1997. Français. ⟨tel-00529362⟩

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