随机地震作用下地基及土石坝永久变形分析

地基及土石坝在地震作用下的永久变形分析方法可分为确定性分析和随机性分析两大类。本文基于等价结点力模型，将地震地面运动模拟为平稳高斯过滤白噪声过程，通过随机地震反应分析，建立了一种地基及土石坝在随机地震作用下的永久变形分析和永久变形危险性分析方法。该法不仅能预测永久变形的平均幅值，而且能给出不同控制变形的破坏概率。本文最后对瀑布沟土石坝进行了数值分析，并给出相关结论。

Permanent Deformation of Foundation and Embankement Dam due to Stochastic Seismic Excitation

The permanent deformation analysis of foundation and embankemet dam due to earthquake is composed of two parts, the first is determinate analysis,the second is stochastic analysis. In the paper, the earthquake ground motion is simulated as a zero-mean stationary Gaussian process. On the basis of equivalent nodal force model and stochastic seismic response analysis, a stochastic seismic permanent deformation and dynamic risk analytical method is established, which can predict not only the average maximum value of earthquake induced deformation but also different reliabilities under different control deformations. At last, a case study on Pubugou embankment dam is made, and the related conclusions is given.