某核电厂软基海堤地震动力响应规律及工程对策探讨  

Study on Dynamic Response Analysis and Engineering Countermeasure of Coastal Levee on Soft Soil Foundation of Nuclear Power Plant

作　　者：孙锋[1] 潘蓉[1] 周群[1] 卢兴利[2] 常猛[1] 

机构地区：[1]环境保护部核与辐射安全中心,北京100082 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《工程抗震与加固改造》2014年第5期138-142,共5页Earthquake Resistant Engineering and Retrofitting

基　　金：大型先进压水堆核电厂国家科技重大专项-CAP1400安全评审技术及独立验证试验(项目号:2011ZX06002-10-16);环境保护部行业科研专项(201309056)

摘　　要：某海堤工程是核电厂专设的防御设计基准外部事件的屏障工程,其在极限安全地震震动(SL-2)作用下的动力响应规律受到高度关注,也是海堤稳定性评价的基础。针对该海堤深厚软土地基的场地条件,讨论了FLAC 3D程序计算时边界条件的设置、动力时程的输入等内容,并建立基于自由场边界条件的三维力学模型对海堤抗震进行非线性计算,分析了海堤加速度、位移及剪切破坏等动力响应规律,在此基础上提出了软基海堤抗震加固的工程对策,可供设计参考。Coastal levee engineering is a barrier engineering in defending the design basis external events in nuclear power plant. The dynamic response laws under ultimate safety ground motion（ SL-2） plays a key role in evaluating the stability of sea wall,which is of importance to the safety of NPP. Based on the soft soil foundation feature of geological unit B,the problems about boundary conditions,dynamic time series,and rational damping for geological body during using FLAC 3D are discussed. 3-D seismic nonlinear dynamic numerical analysis model is built by using free-field boundary in FLAC 3D,which can embody the coupling interaction between soil and structure. Furthermore,the earthquake response laws are put forward,such as PGA,displacement,and shear-strain increment. The results can contribute to further researches on the mechanism of sea wall instability under earthquakes and design of strengthening project.

关 键 词：非线性动力分析 海堤工程 极限安全地震震动(SL-2) 软土地基 核电厂 

分 类 号：U656.2[交通运输工程—港口、海岸及近海工程] P315.9[交通运输工程—船舶与海洋工程]