Research on distributing disciplinarian of the seismic acceleration of concrete-faced rockfill dam

On the condition of different dam heights and different shapes of river valley, 3-D dynamical responses of concrete-faced rockfill dams subjected to different seismic intensity input are analyzed based on equivalent-linear model in this paper. The results show that, the distribution of the acceleration along the dam heights at the edge points on the central section is S-shaped; the acceleration increases along with the heights under the half height; the acceleration reduces along with the increasing heights on the section h=(0.5~0.8) H; the acceleration increases along with the heights on the section h =(0.8~1.0)H. The acceleration magnification which becomes less on the section 0-5/6H increases markedly on the section exceeding 5/6H. The acceleration on the central section 0.5H approximates 0.5 times the top of the dam and the acceleration value on 5/6H is about 0.4 times the top of the dam. With the input of the acceleration increased, the acceleration magnification at the direction along the river bank on the central section of the top of the dam assumes the trend to reduce. The spectrum characteristics of the seismic waves have greater influence on the acceleration response of the dam.