SEISMIC ANALYSIS OF THE ZIPINGPU CONCRETE FACED ROCKFILL DAM IN WENCHUAN EARTHQUAKE

摘要

On May 12 2008, a great earthquake of magnitude 8.0 occurred in Wenchuan County of SichuanrnProvince, western China. The Zipingpu Concrete Face Rock-fill Dam (CFRD) with 156m height,rnwhich was 17km away from the epicenter, was considerably damaged by Wenchuan Earthquake. Thernsite investigation showed that the maximum permanent settlement was about 100 cm and thernhorizontal displacement was about 60 cm as a result of the earthquake. It was estimated that the peakrnacceleration in the top the dam along the axial and vertical direction was about 2000gal, and the peakrnacceleration along the river was about 1600gal. It was calculated that peak acceleration of damrnbedrock was more than 500gal and the seismic intensity was more than 9 degrees. The actualrnexperience of the peak acceleration and seismic intensity of the Zipingpu CFRD in this earthquake wasrnfar ahead of the original design standards. Based on the in-situ investigation, 3D numerical model ofrnthe Zipingpu CFRD was established and the numerical simulation analysis on Wenchuan earthquakerndamage was carried out. The calculated results showed that the numerical analyses were consistent tornthe in-site investigation. The seismic performance of the Zipingpu CFRD during Wenchuanrnearthquake was reproduced in the numerical model. The acceleration response, permanent deformationrnand damage characteristics of the Zipingpu CFRD in Wenchuan earthquake were understood.