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Título del libro: 18th International Conference On Soil Mechanics And Geotechnical Engineering: Challenges And Innovations In Geotechnics, Icsmge 2013
Título del capítulo: Safety of a protection levee under rapid drawdown conditions. Coupled analysis of transient seepage and stability

Autores UNAM:
NORMA PATRICIA LOPEZ ACOSTA; GABRIEL YVES ARMAND AUVINET GUICHARD;

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Autores externos:

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Idioma:
Inglés

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Año de publicación:
2013

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Palabras clave:

Deformation; Embankments; Geotechnical engineering; Levees; Mesh generation; Safety engineering; Safety factor; Seepage; Slope protection; Slope stability; Soil mechanics; Soils; Stability; Water levels; Coupled analysis; Earth structures; Multiple parameters; Rapid drawdowns; Soil constitutive model; Stability analysis; Stress strain; Transient seepage; Finite element method

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Resumen:

The rapid drawdown condition arises when submerged slopes of protection levees experience a rapid decrease of the external water level. In this paper the safety of a protection levee under rapid drawdown conditions is studied by numerically modeling this phenomenon as a coupled problem of transient seepage-deformation in a saturated/unsaturated medium. Analyses are performed based on finite element method by using the PLAXFLOW program for transient seepage analysis and the PLAXIS program for deformation, consolidation and stability analyses. The details of the proposed methodology are presented in this work. Also, recommendations for definition of material type (drained or undrained), type of soil constitutive model (Hardening Soil and Mohr Coulomb), boundary conditions and mesh generation of finite elements are provided. In the main part of the paper, the effects of multiple parameters such as position of phreatic surface, water drawdown ratio, drawdown rate and hydraulic conductivity are evaluated by a 2D model of stress-strain. Special emphasis is given to the study of the safety factor variation as a function of time obtained when assessing the stability of these earth structures. Finally, concluding comments about the results are exposed.

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Entidades citadas de la UNAM:

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Fuente:


ISBN:
9782859784782
Editorial:
IOS Press

Tipo de producto:
Conference Paper