Utilize este identificador para referenciar este registo: http://hdl.handle.net/10362/40906
Título: Stability analysis of gravity dams for the maximum design earthquake
Autor: Varagilal, Igor Acoob
Orientador: Almeida, João
Azevedo, Nuno
Palavras-chave: gravity dam
rock mass foundation
numerical modelling
hydrodynamic behavior
shear sliding
Rayleigh damping
Data de Defesa: Jun-2018
Resumo: This thesis presents a two-dimensional hydrodynamic stability analysis of gravity dams for the maximum design earthquake. The coupled mechanical and hydraulic behavior of the dam’s rock mass foundation is taken into account. The main aspects concerning gravity dams are presented along with their main failure causes. The safety rules currently in use and approved by the International Commission on Large Dams (ICOLD) Seismic Committee are presented. The fundamental elements of seismic application relevant for the models used in this work are also presented, such as the dynamic interaction between the reservoir and the upstream face of the dam, adequate boundary conditions for an explicit method and different damping hypotheses. Two dams of different height are numerically analysed. Both dams have rock mass foundations with identical geometry, with horizontal and vertical discontinuities, and the grout and drainage curtains are simulated. Analysis is carried out with a discontinuum model, Parmac2D-FFlow. The displacements at the base of the dam, both on the dam’s heel and the dam’s toe, are compared for the Rayleigh damping hypothesis and the mass proportional term damping. In every case studied two different situations regarding the dam foundation behavior are considered: i) non-linear behavior of the dam/foundation interface and elastic behavior of the fractured rock mass area and ii) non-linear behavior of both the dam/foundation interface and the joints in the fractured rock mass area. The results presented allow the analysis of the effect of the peak ground acceleration to be carried out. Conclusions are drawn regarding the effect of joint normal stiffness on the behavior of gravity dams due to seismic loads.
URI: http://hdl.handle.net/10362/40906
Designação: Mestre em Engenharia Civil – Perfil de Estruturas
Aparece nas colecções:FCT: DEC - Dissertações de Mestrado

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