Studying On The Flow-induced Vibration Characteristics Of Flood Discharge Structures Of Jinping ? Arch Dam

In view of the characteristics of the southwest water cons ervancy hub such as high water head,large flow and narrow valley,the arch overload capacity and new materials are used to make the high arch dam tend to be "light" gradually.However,on account of the water energy is added increasingly with the raise of the dam height,the problems of the dam and downstream water cushion pond are more and more serious when the flood drainage happened.As a result,an increasing number of experts and scholars pay attention to the influence of the drainage flood to structu ral vibration.In recent years,many domestic and foreign scholars analysis and research the rapids vibration based on model test(or prototype observation)and theoretical analysis,and the stability of rapids vibration to the flood drainage structures is studied a lot.But the counter analysis of the stability of the dam and the water cushion pond based on the experiment of water conservancy observation is seldom.In this paper,based on the practical engineering,the vibration of the dam body and water cushion pond in drainage condition are analyzed under the background of the prototype observation of the Jinping-I arch dam body and water cushion pond the world's tallest arch dam water conservancy hub.Meanwhile,the structural stability of Jinping-I arch dam and its downstream water cushion pond safety are evaluated by Combining with numerical model,the counter analysis method and genetic algorithm,and the safety stability of upper outlet radial gate by using the analysis results.The main contents are as follows:(1)The drainage structure vibration of the dam body and the downstream water cushion pond is analyzed.Based on the prototype observation,the data of dam top and the water cushion pond bottom are collected through the drainage from deep and upper outlet and the safety stability of the drainage structure are evaluated,the drainage building vibration characteristics and laws under different flood drainage conditions are given combined with the results of data analysis.(2)The characteristics of dam body and water cushion pond studied by using the counter analysis is compared with the prototype observation.Using the counter analysis theory,the equivalent load of rapids vibration is regressed by taking advantage of the existing measuring poi nt and 3d numerical model.Consequently,the vibration displacement response of drainage structure is gained,and compared with the actual vibration displacement response of the prototype observations to verify the feasibility of counter analysis.(3)As water retaining structure,upper outlet gate is induced by the rapids vibration.The influence of the dam vibration caused by the deep outlet drainage to the stability of upper outlet radial gate studied.Moreover,by using the counter analysis,the vibration signals of upper outlet gate under the different drainage conditions is obtained,the 3 d numerical model of the upper outlet radial gate is established,and combined with the numerical analysis results,its vibration displacement response and characte ristics are also gained.