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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。
In this paper, the dynamic characteristics of Laxiwa arch dam-reservoir-soil-foundation coupling system are studied by mathematical model, and the dynamic response of random vibrations of turbulence-induced coupling system of water cushion impact plunge pool is analyzed. The results show that: (1) The natural frequency of Laxiwa arch dam is low and the adjacent vibration modes are dense. The reservoir water not only reduces the frequency (up to about 19%), but also changes its vibration mode distribution. (2) The characteristics of foundation materials (specific gravity, elastic modulus) have a great influence on the dynamic characteristics of arch dam system. In the hydro-elastic simulation test, the material with the real modulus and specific gravity of foundation must be used. (3) The dynamic displacement of arch dam system induced by water hammer impacting the plunge pool is small. The calculated results are compared with the results of 1: 150 Laxiwa hydroelastic simulation.