Numerical Study on Dam-Foundation-Dam Interaction

Abstract:

As dams approach the end of their design life periods, retrofitting of dams is needed in many cases. For the retrofitting procedure of building a new dam close to the existing old dam without demolishing it, the interaction between the two dams and the unbounded foundation is an important issue to be investigated. The influence of the existing dam on the dynamic response of the newly built dam is examined. Two systems are analyzed, i.e., the new dam-foundation system and the dam-foundation-dam system. For the two systems, modal analysis and time history analysis using the viscous-spring artificial boundary are performed. It’s found that there’re much more vibration frequencies for the dam-foundation-dam system as compared to the new dam-foundation system within the same frequency range. The existence of the old dam also induces one more peak and a wider plateau in the response spectrum of the acceleration time history of the dam crest. However, the maximum stress distribution is not influenced much by the old dam.

• Periodical: Applied Mechanics and Materials (Volumes 353-356)
• Pages: 933-936
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.353-356.933
• Online since: August 2013
• Authors: Hong Zhong*, Hong Jun Li
• Keywords: Dam Retrofitting, Dam-Foundation-Daminteraction, Dynamic Interaction, Viscous-Spring Artificial Boundary

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