Numerical Simulation And Application Of Concrete Gravity Dam Under Seismic Action

Preventing dam earthquake disaster study is an important part in the relationship between China’s overall economic and social development of disaster prevention and mitigation in major work. It is a strategic key technology problem that must be solved in the construction of water conservancy and hydro-power in China, and also it is the frontier issues in the field of engineering earthquake resistance. For this purpose, this paper carries on the numerical simulation analysis of the dynamic response of the dam during the earthquake, which provides a reference for the design and seismic research of the gravity dam.In order to research the application of added mass method in seismic analysis of 3-D gravity dam, the subroutine UEL is developed based on the two time development function of ABAQUS,and realizing the fast application of the added mass of nodes in 3D model. The correctness of the program is verified by simulating the seismic engineering of Koyna concrete gravity dam. The calculation results are in accord with the Koyna damage record, so it proves that the development of the subroutine UEL is correct and reliable. It is feasible to use this method to deal with the interaction problem of 3-D water- structure.Secondly, Taolinkou concrete gravity dam was used as the research object, and simulated the dynamic response of Taolinkou dam under the action of Qian’an seismic wave. And the influence of three directions of earthquake acceleration in earthquake was studied. According to the results,counting the earthquake action of three directions at the same time is the most unfavorable for the dam body, and the acceleration of vertical direction and the transverse direction all have important influence on the seismic analysis. In the stress analysis, the influence of vertical seismic action is larger, and the influence of transverse earthquake wave is smaller. In the analysis of displacement,the influence of transverse direction seismic wave is more obvious.Thirdly, the mufti wave checking analysis has been carried on of Taolinkou dam, According to the results, the seismic damage parts on dam are different under different seismic waves, indicating that the dam seismic response is different when the seismic waves is different. The position of the dam neck is weak parts in the earthquake, but also can not ignore the security and stability in other parts of the body.Finally, researched the influence of the height of downstream turning point on the seismic performance of concrete gravity dam, It is found that the seismic performance of the dam can beimproved by increasing the height of downstream turning point. In order to ensure the safety and stability of the dam in strong earthquake, the downstream turning point should be controlled more than 80% of the dam height.This research is expected to provide more insights into the seismic performance of gravity dam and optimize the seismic measures.