不同高度面板堆石坝幅频反应的比较研究

Comparative research on frequency spectrum of concrete faced rockfill dam of different height

一定的坝址地基未来所可能产生地震的卓越周期有一定范围。面板堆石坝的动力设计应尽量使坝体的高反应频率带与地基的卓越频率远离。不同高度面板堆石坝幅频反应比较研究的目的是弄清楚不同高度坝体的高动力反应频率带,为坝址与坝高的配套选择提供参考。本文通过对50 m、100 m、150 m、200 m面板堆石坝幅频反应的研究表明,面板堆石坝最适合修建在岩基上,高坝比低坝适合修建的地基范围更广。

Predominant period of earthquake has a definite range when type of site soil of the dam is constant. Resonance will be obviated is the object in dynamic design of structure. But concrete faced rockfill dam is a nonlinear structure, the frequency often change in earthquake. In commonly, the frequencies of the dam don't describe full dynamic behavior of the dam, it may be describe by the frequency spectrum curve. The frequency range of high dynamic response will be known in frequency spectrum curve. When dynamic design of the concrete faced rockfill dam, it is should be considered that keep the predominant period take away the frequency range of high dynamic response of the dam. It is mainly object to determine the frequency range of high dynamic response of the dam with different height. It will provide reference to choice the height of the dam when the dam site is settled. In this paper, the frequency spectrum of concrete faced rockfill dam that the height of dam is 50,100,150,200 meters is researched, and it is showed that concrete faced rockfill dam build compatibly on rocky ground, the suited ground of high dams is comprehensive than low dams.