滨海核电厂取水口堤头地基三维地震响应分析  

Three-dimensional seismic response analysis of the foundation of the intake head of the offshore nuclear power plant

作　　者：刘昱平 赵杰[1] 兰雯竣 LIU Yuping;ZHAO Jie;LAN Wenjun(R&D Center of the Civil Engineering Technology,Dalian University,Dalian 116622,China)

机构地区：[1]大连大学土木工程技术研究与开发中心,辽宁大连116622

出　　处：《自然灾害学报》2020年第3期100-109,共10页Journal of Natural Disasters

基　　金：国家自然科学基金重点项目(51738010);国家自然科学基金面上项目(51678100);辽宁省自然科学基金指导计划(20170540043)。

摘　　要：以某核电站海域工程取水明渠导流堤为背景,研究取水明渠堤头在地震作用下的动力响应规律,从结构的位移时程、结构变形、超孔压比、液化区域等方面定量评价取水明渠堤头结构的安全性。采用MIDAS/GTS NX TO FLAC3D的建模方法,结合PL-Finn液化后大变形本构模型,通过FLAC3D有限差分程序开展动力响应数值模拟。计算结果表明:砂土液化后发生流动使导流堤结构出现规律性残余变形,且随地震强度增加而变大;与基底输入地震动相比,在堤头结构顶部水平和竖直加速度放大2-3倍,且越靠近堤头顶部处加速度呈现出明显放大效应。综合判断地震产生的永久变形不至于使堤头结构向海侧滑移,不会影响到核电厂安全用水。本文研究成果可为类似项目抗震设计提供参考。Taking the diversion dike of the intake open channel in the sea area of a nuclear power plant as the background,the dynamic response law of the intake open channel dike head under the action of earthquake is studied.The safety of the structure of the intake open channel dike head is quantitatively evaluated from the aspects of structural displacement time history,structural deformation,excess pore pressure ratio,liquefaction area and so on.Using the modeling method of MIDAS/GTS NX TO FLAC3D,combined with the large deformation constitutive model of PL-Finn after liquefaction,the numerical simulation of dynamic response is carried out by FLAC3D finite difference program.The calculation results show that the flow of sand after liquefaction leads to the regular residual deformation of the diversion dike structure,which increases with the increase of earthquake intensity,and compared with the input ground motion of the base,the horizontal and vertical acceleration at the top of the dike head structure is magnified by 2~3 times,and the acceleration closer to the top of the dike head shows an obvious magnifying effect.It is comprehensively judged that the permanent deformation caused by the earthquake will not cause the dike head structure to slip to the sea and will not affect the safe water use of the nuclear power plant.The research results of this paper can provide reference for seismic design of similar projects.

关 键 词：取水导流堤 稳定性 PL-Finn 残余变形 地震响应 

分 类 号：TV67[水利工程—水利水电工程] X9[环境科学与工程—安全科学]