【摘要】 围绕经受了"5.12"汶川大地震的紫坪铺大坝的震后加固,根据地震后最新核定的地震动参数,采用三维真非线性动力反应分析方法,进行了紫坪铺大坝震后抗震安全评价。紫坪铺大坝是经历了汶川大地震强震的,在进行震后的抗震计算和抗震安全性评价时,应当考虑前期震动的影响。采用试验研究和计算分析,研究了前期震动对大坝地震反应的影响,进行了设计地震下的大坝动力分析,从稳定、变形、面板防渗体系安全等多角度,对震后大坝的抗震安全性进行了评价,分析了抗震薄弱环节,对抗震加固措施提出了建议。所提出的抗震安全性评价方法以及有关规律和结论,可为工程设计和建设提供技术依据。更多还原

【Abstract】 The post-earthquake seismic safety of Zipingpu dam that suffered from 5.12 Wenchuan earthquake,is evaluated by using a 3D authentic nonlinear dynamic analysis and the latest approved parameters of earthquake ground motion.In the evaluation,the effect of pre-vibration caused by this earthquake of great intensity is considered.Both experimental cyclic triaxial test and numerical analysis are used for a dynamic analysis of the dam under design earthquake.The post-earthquake evaluation is a comprehensive study on stability,deformation and safety of face slab impervious system,etc.,and seismic weak points are revealed.This work provides references for design of CFRD.更多还原