Dynamic analysis of concrete gravity dam considering Dam-Reservoir Interaction: Case study of Koyna Dam

Document Type : Research paper

Authors

1 Associate professor, Faculty of Civil Engineering, Tabriz University, Tabriz, Iran

2 Master of Science in Hydraulic Structures, Tabriz University, Tabriz, Iran

3 Master of Science in Water Structures, Islamic Azad University Science and Research Branch, Tehran, Iran

10.22034/hydro.2022.12899

Abstract

Today, construction of dams to collect and store river water for different consumption purposes including drinking, agriculture, and industry is inevitable. Nevertheless, dams are colossal structures that pose potential dangers to their downstream community and their failure can be catastrophic. Dynamic analysis of concrete dams is more complex than that of conventional structures due to the presence of a reservoir. This complexity mainly results from the dam-reservoir interactions in seismic conditions. In this study, the seismic response of concrete gravity dams was investigated using Abaqus finite element software in different conditions of full, half-full, and empty reservoir. To this end, Koyna concrete gravity dam with specific geometric and physical characteristics was analyzed by applying Kobe earthquake records. The results from finite element analysis showed that the values ​​of the main stresses in different modes of analysis were considerably significant. Most of these stresses occurred at the site of the downstream slope change (level of 66.5 m), thus causing stress concentration in this area. Furthermore, according to the results, upon increasing the reservoir level, the amount and intensity of displacement fluctuations would increase, mainly due to the dam-reservoir interactions and effect of fluctuations in the hydrodynamic pressure of the reservoir in the time curve of the displacement in the crown of dam. In general, in case the reservoir is full, the levels of stress and displacement would be higher than those in other modes.

Keywords

References

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Hydrogeology
Volume 7, Issue 1
Publisher
September 2022
Pages 53-68

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