拱坝——库水——地基耦合系统坝身泄洪动力分析

本文用数学模型的方法研究了拉西瓦拱坝－库水－地基耦合形成的动力特性，分析了不舌部 水垫塘紊流诱发耦合系统的随机振动的动力响应，研究表明：（１）拉西瓦拱坝系统自振频率低，相邻振型密集，库水不但频率降低（最大约１９％），而且改变了其振型分布，（２）地基材料的特性（比重、弹模）对拱坝系统的动力特性影响较大，在水弹性模拟试验中必须采用与地基真实弹模和比重接近的材料。（３）水舌冲击水扩建塘诱发拱坝系统的动位

Dynamic analysis for vibration of dam-water-foundation coupling system during discharge

Dynamic behaviors and stochastic response of the coupling system arch dam -reservoir water - foundation induced by nappe impacting into plunge pool are studied. It shows that:(1) the natural vibration frequencies of the coupling system are low and the vibration modes are closely concentrated, the reservoir water not only plays the role in lowering the frequencies(19% at most)but also altering the distribution of natural vibration mode;(2) The characteristics of the foundation (elastic modulus and relative density) will greatly effect the dynamic behaviors of the coupling system;(3) dynamic displacement and stress of the coupling system induced by nappe impacting pool are insignificant. The computational results are to be compared with the test of 1:150 hydro-elastic model.