复杂地基条件下核电取水口结构地震响应及稳定性分析  

Seismic response and stability analysis of nuclear power intake structure under complex foundation conditions

作　　者：王桂萱[1] 温林莉 赵杰[1] 尹训强[1] Wang Gui-xuan;Wen Lin-li;Zhao Jie;Yin Xun-qiang(Dalian University Civil Engineering R&D Center,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：《工程抗震与加固改造》2020年第4期143-150,共8页Earthquake Resistant Engineering and Retrofitting

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：核电取水口结构为核电海域工程的重要组成部分,属于Ⅰ类抗震物项。本文以某核电取水口结构为背景,基于ANSYS建立不均匀地层的复杂结构-地基系统三维有限元计算模型,通过三维有限元数值分析,研究取水口结构在地震作用下的应力和变形变化规律,探索取水口结构的地震响应特点,给出不同工况下结构整体的应力、位移变形分布云图及桩身内力分布规律。同时对取水口地基进行稳定性分析,得出其边坡滑动面位置和动力安全系数时程曲线。数值模拟结果表明:上部闸门井边缘、承台边缘以及墙体与底板的交接处这些部位为结构的薄弱环节,桩身内力值及地基整体稳定性满足核电厂抗震设计规范要求。本文的分析方法和结论对以后类似项目有一定的参考和借鉴意义。The intake structure of nuclear power plant is an important part of nuclear power offshore engineering,it belongs to the antiseismic category Ⅰ. This paper takes a nuclear power intake structure as the background,a three-dimensional finite element calculation model of complex structure-foundation system with inhomogeneous strata is established based on ANSYS. Through of three-dimensional finite element analysis,the stress and deformation variation law of intake structure under ground motion is studied. Through the investigation of the structure response characteristics of the intake structure,the stress distribution diagram,displacement deformation distribution diagram and pile internal force distribution of the whole structure under different working conditions are given. At the same time,the foundation stability analysis is carried out,and the sliding surface position and dynamic safety factor time history curve are obtained. The numerical simulation results show that the upper gate well edge,the cap edge and the junction between the wall and the floor (the bottom edge of the gate groove) are the weak links of the structure,the pile internal force value and the overall stability of the foundation meets the seismic design specifications of the nuclear power plant. The analysis methods and conclusions of this paper have certain reference significance for similar projects in the future.

关 键 词：核电取水口 地震响应 桩土相互作用 稳定性 

分 类 号：TV671[水利工程—水利水电工程]