金佛山沥青混凝土心墙堆石坝地震反应三维有限元分析

Three-dimensional Finite Element Analysis of Seismic Response for Jinfoshan Asphalt Concrete Core Rockfill Dam

针对金佛山沥青混凝土心墙堆石坝的特点,采用三维非线性动力有限元法进行了地震动力反应分析,重点研究了坝体在地震荷载作用下的加速度、动应力、地震永久变形的变化规律和分布。结果表明,加速度在坝顶附近达到最大值,存在明显的鞭梢效应;动应力在坝体分布较均匀;坝体永久变形不大。可见大坝整体抗震性能较好,满足给定地震作用下的抗震安全性要求。

Aiming at the characteristics of Jinfoshan asphalt concrete core rockfill dam, three dimensional nonlinear dynamic finite element method is used to analyze seismic dynamic response. The response of acceleration and dynamic stress and the regular pattern and distribution of permanent deformation are studied under seismic loads. The results show that the crest has larger acceleration response and appears obvious whiplash effect; the dynamic stress of dam body is uniform distribution and its permanent deformation is little. The overall seismic performance of the dam is good enough to meet the seismic stability requirements under the given earthquake.