地震输入角度对抽水蓄能高面板堆石坝动反应影响研究

本文采用三维有限元计算方法和沈珠江动本构模型,研究某高烈度区大倾角坝基上高面板堆石坝的动反应特性。首先,讨论了地震波水平输入角度对面板堆石坝动反应的影响,以地震过程中坝顶峰值加速度,坝体最大动位移与最大动应力,面板最大变形值及最大动应力五个指标作为主要评判标准,对比地震波在八个不同水平输入角度下坝体动反应的大小,发现水平输入角度每改变45°,五个指标均随之变化,呈现"W"型变化规律,180°为最不利输入角度,各项指标都处于峰值点。然后,针对处于大倾角坝基上的抽水蓄能高面板坝进行了坝体动反应和坝坡稳定性分析,获得了堆石坝反应加速度随着坝高的增加而增大,以及震后存在残余变形等地震反应特性。最后验证了该工程坝体在地震反应过程中的安全性。研究结果可为高烈度地区倾斜坝基上高面板坝的动反应设计提供参考。

Study on the influence of seismic wave input angle on dynamic response of high face slab pumped storage dam

In this paper,the dynamic response of pumped storage high-faced rockfill dam with large dip dam foundation in a high-intensity area is studied by the three-dimensional finite element method and the dynamic constitutive model of Shen Zhujiang.Firstly,the influence of the horizontal input angle of seismic waves on the dynamic response of concrete face rockfill dam is studied.Five indexes are taken as the main evaluation criteria,including the peak acceleration of dam crest,the maximum dynamic displacement and maximum dynamic stress of dam body,the maximum deformation value and maximum dynamic stress of panel during earthquake.By comparing the magnitude of dam dynamic response under eight different horizontal input angles of seismic wave,it is found that the five indexes change with each 45° change of horizontal input angle,it shows a "W" pattern of change,the angle 180° is the most unfavorable input angle,and all indexes are at their peak points.Then,the dynamic response analysis and slope stability analysis of pumped storage high-faced rockfill dam with large dip dam foundation are carried out.It is obtained that the response acceleration of rockfill dam increases with the increase of dam height,and there are seismic response characteristics such as residual deformation after earthquake.Finally,the safety of the dam in the seismic response process is verified.The research results can provide reference for the design of dynamic response of high-faced dam on inclined dam foundation in a high-intensity area.