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Descripción
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| One of the main concerns in gravity dam design is sliding. For dams founded in fractured rock masses, sliding can develop through the foundation when a joint set occurs into it. This condition increases the likelihood of slip between the contact planes of the joint. In this work, a methodology for analysis of stability of gravity dams in this situation is presented, which considers a sliding along a sub-horizontal and impersistent joint that starts in the toe of the dam. For that purpose, the safety factor is calculated as the ratio of resisting to driving forces, obtained by a static analysis, on the sliding plane. The mechanism assumes the sliding along the joint, with a shear strength given by the Barton and Choubey criterion (1977), and a potential failure path in the intact rock, considering the Hoek-Brown strength criterion (1980). The proposed methodology incorporates the possible presence of a crack in the base of the dam and a non-associated behavior of the rock mass. A numerical simulation, with the difference numerical code FLAC, is employed to validate the failure mechanism. Two aspects are compared: (i) the geometry of the failure mechanisms obtained by both methods; and (ii) the computed safety factors in limit equilibrium conditions. After the validation of the methodology, parametric studies are carried out to determine the influence of the rock mass and rock joint strengths, as well as of the geometry of the mechanism proposed, on the stability of a gravity dam against sliding. | |
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Internacional
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Si |
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Nombre congreso
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The 23rd European Young Geotechnical Engineers Conference (EYGEC-2014) |
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Tipo de participación
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960 |
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Lugar del congreso
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Barcelona |
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Revisores
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Si |
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ISBN o ISSN
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978-84-697-1036-4 |
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DOI
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Fecha inicio congreso
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02/09/2014 |
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Fecha fin congreso
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05/09/2014 |
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Desde la página
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197 |
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Hasta la página
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200 |
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Título de las actas
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EYGEC-2014. The 23rd European Young Geotechnical Engineers Conference |