秦山核电站厂址地震动加速度时程预测研究
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摘要
本文研究了建立设计地震震源模型和用理论地震学方法预测基岩场地地震动加速度的技术途径,预测了四个设计地震事件在秦山核电站厂址的加速度时程和反应谱.文中根据对地质和历史地震资料的研究,确定不同性质的设计地震事件,建立设计地震震源和工作区介质的确定性模型。针对未来地震的不可完全预见性,以及对地球介质和震源性质现有认识的局限性,文中发展了确定性和随机性相结合的综合分析方法。在用确定的介质模型和设计震源计算地震动加速度的同时,采用在震源参数中引进随机扰动量、对大量模型样本作统计分析的方法进行处理。
n this paper we develop an approach for predicting the acceleration time history of ground motion on basic rock site using the theoretical seismology method. The acceleration time histories and response spectra in the Qinshan Nuclear Power Station are estimated. Four earthquakes with differnet properties and corresponding broad-band source models are designed depending upon the researches on the geology and the historic earthquakes in the studied region. Because the designing earthquake is a potential event occurring in the future, it can not be full determinant. Moreover there are the limitations of understanding the complex source process and the heterogeneity site structure. A synthetic method to combine both determinant and stochastic ways is studied. The ground motions are computed for specific source and medium models. The random disturbance quantity is introduced into the source parameters, and a statistical analysis for a large number of estimators is made.
引文
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