拱坝-库水-地基耦合系统坝身泄洪动力分析  

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

作　　者：吴一红[1] 李世琴[1] 谢省宗[1] 

机构地区：[1]中国水利水电科学研究院水力学所

出　　处：《水利学报》1996年第11期6-13,共8页Journal of Hydraulic Engineering

基　　金："八五"国家重点科技攻关项目

摘　　要：本文用数学模型的方法研究了拉西瓦拱坝—库水—地基耦合系统的动力特性,分析了水舌冲击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,库水不但使频率降低(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)水舌冲击水垫塘诱发拱坝系统的动位移、动应力均较小。计算结果与1:150拉西瓦水弹性模拟实验结果进行了比较。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.

关 键 词：拱坝 库水 地基 坝身泄洪 耦合振动 动力响应 

分 类 号：TV642.4[水利工程—水利水电工程] TV312