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对汶川地震后紫坪铺面板堆石坝台阵余震记录进行了分析,研究实测余震地震动频谱特性等基本特征。选择有代表性的坝址基岩台站记录到的余震地震动作为大坝地震动输入,对紫坪铺大坝进行了三维动力有限元分析,并将计算得到的坝体加速度放大倍数与不同坝高台站的监测数据进行了对比。研究结果表明:实测余震地震动加速度反应谱在短周期部分有一定波动,在周期稍长时随周期增加而衰减,符合地震动反应谱的基本特征;综合实测大坝反应、数值计算结果以及以往实测相关资料,本次紫坪铺大坝余震实测结果反映了土工构筑物反应的一般规律。
The aftershock records of the Zipingpu face rockfill dam after the Wenchuan earthquake are analyzed, and the basic characteristics such as the spectral characteristics of the measured aftershock earthquakes are studied. Select the representative basement rock station recorded aftershock seismic motion as dam ground motion input, the Zipingpu dam three-dimensional dynamic finite element analysis, and the calculated dam acceleration magnification and different Dam high station monitoring data were compared. The results show that the measured response spectrum of the measured aftershock has some fluctuations in the short period, and decay with the increase of the period when the period is slightly longer, which is consistent with the basic characteristics of the seismic response spectrum. Based on the measured dam response, numerical results and the past According to the measured data, the actual measured results of aftershocks of Zipingpu Dam reflect the general rules of geotechnical structures’ response.