复杂地质条件下某滨海核电厂进水口两侧翼墙抗震安全分析

核电取水区域翼墙结构是核电厂正常运行中不可或缺的枢纽,故其在复杂地质条件下的抗震安全性评价至关重要。以中国滨海某示范快堆工程取水区域为项目背景,基于ANSYS软件及用户可编程特性(user programmable features, UPFs)二次开发工具建立进水口翼墙-地基三维动力相互作用模型,考虑厂址的地基非均质特性和多荷载耦合作用进行静动力联合分析,得出不同工况下进水口翼墙整体的主应力分布情况,以及结构变形和构件内力的变化规律,同时基于Geo-Studio岩土专业软件对地基整体稳定性进行分析。分析结果表明:翼墙底板靠近填土角缘区域是结构的薄弱部分,应加强配筋;翼墙地基中的砂土层基本不发生液化,并且其地基稳定性均满足抗震设计规范要求。通过对翼墙结构进行抗震安全分析,旨在为类似厂址条件下的核电海域项目提供一定的借鉴和参考。

Seismic safety analysis of the two-side wing walls of intake of a coastal nuclear power plant under complex geological condition

The wing wall structure of nuclear power water intake area is an indispensable pivot in the normal working of nuclear power plants, so its seismic safety evaluation under complex geological conditions is vitally important. Taking the water intake area of a coastal demonstration fast reactor project in China as the project background, the three-dimensional dynamic interaction model of intake wing wall-foundation is established based on the ANSYS application program and User Programmable Features (UPFs) secondary development tools, and the static and dynamic joint analysis is carried out considering the heterogeneous characteristics of the foundation and the multi-load coupling action. The principal stress distribution of the whole intake wing wall, as well as the variation rules of structural deformation and the internal force of members under various operation conditions are given. At the same time, the foundation overall stability analysis is carried out based on Geo-Studio geotechnical professional program. The analysis results show that the bottom plate of wing wall near the corner edge of the fill is the weak part of the structure and reinforcement should be strengthened; the sand layer in the foundation of wing wall basically does not liquefy, and its foundation stability satisfies the demands of the seismic design specification. Through the seismic safety analysis of the wing wall structure, the purpose is to act a part in reference for the nuclear power marine projects under analogous site conditions.