Abstract:

3-D dynamical response analysis of concrete-faced rockfill dam is presented. Using equivalent-linear model, for different dam heights and different shapes of river valley, the responses of dam subjected to different seismic wave inputs have been studied. The results show that on the condition of the same dam height and the base acceleration excitations unchanged, with the increase of the river valley width, the position of the maximum acceleration on the axis of the top moves from the middle to the riversides symmetrically. To the narrow river valley, the position of the maximum acceleration which occurs near the riversides to the wide valley is on the middle of the axis at the top. The result negates the application of 2-D dynamical computation for wide valleys, and shows that for the seismic response of high concrete-faced rockfill dams, the seismic amplification factor along the axis should be given, except for that along the dam heights.

Key words: concrete-faced rockfill dam, 3-D dynamical response analysis, equivalent-linear method, seismic amplification factor, maximum acceleration