Dam-Water-Foundation System Interaction Numerical Research

Hydropower resources in China ranks first in the world, but their distribution is uneven, about 80% concentrated in the west, mainly southwest. This area is a new strong tectonic movement and highly volatile geological environment mountain valley areas, which has a high incidence of strong earthquakes and geological hazards. At present, under construction and proposed a series of 200-300 m level high dams, such as Xiaowan, Goupitan, Xiluodu, Baihetan,Jingpin,Nuozhadu, Laxiwa, Wudongde, Dagangshan and so on.strategical project are all in these high earthquake intensity areas. Seismic safety is the key point in these high earthquake intensity areas, shocking earthquake which happened in Sichuan province China on May 12th in 2008 make people more clearly recognized this.This paper describes dynamic analysis theory of structure, fluid-solid coupling problem of the finite element method. From the point of view of fluid-solid coupling, deep research has been made on the principle of the dam and reservoir interaction. Through using FORTRAN language, developed a finite element program of dam-water-foundation system interaction.Calculate a gravity dam and an arch crown beam by the FORTRAN programme, Qualitatively analyze the quality foundation model and the massless foundation model, discuss the additional mass model of current specification and the fluid-solid coupling model basing on interaction theory, Compared to the additional mass model, we can see that the fluid-solid coupling mode has smaller results at most parts, which better reflects the actual dam-water interaction.By using large-scale finite element software ADINA, establish dam-water system's fluid-solid coupling model, conducted modal analysis, seismic time-history response analysis, and then give an arch dam example, and study the arch dam's mode and self-vibration which is affected by the water level and the reservoir water compression. As an engineering application, establish dam-water-foundation system's fluid-solid coupling model through a arch dam, calculate the dynamic characteristics and seismic response of the arch dam, and obtained some valuable results for the engineering design.