地下水位对核电结构地震反应的影响分析  

Influence of groundwater level on the seismic response of nuclear power structure

作　　者：吴绍恒 陈少林[1] 刘鸿泉 孙晓颖 WU Shao-heng;CHEN Shao-lin;LIU Hong-quan;SUN Xiao-ying(Department of Civil and Airport Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Institute of Engineering Mechanics,CEA,Harbin 150080,China;China Nuclear Power Engineering Co.,Ltd.,Beijing 100840,China)

机构地区：[1]南京航空航天大学土木与机场工程系,江苏南京210016 [2]中国地震局工程力学研究所,黑龙江哈尔滨150080 [3]中国核电工程有限公司,北京100840

出　　处：《振动工程学报》2024年第4期556-564,共9页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(U2039209,51978337);华龙一号及在役核电机组关键技术装备攻关工程项目——核电厂结构分析软件资助项目。

摘　　要：核电结构大多沿海或沿江、河而建,在地下水位以下,土体孔隙中的流体对土层的地震响应有较大影响,进而影响核电结构的响应。本文采用饱和多孔介质模型,考虑土-结相互作用效应,分析地下水位对核电结构地震反应的影响。通过传递矩阵方法,得到干土-饱和土水平成层场地的自由场,并结合透射人工边界,实现土-结相互作用分析的波动输入;采用土-结相互作用的分区并行计算方法,实现饱和土和结构相互作用分析。其中,含地下水位的场地土体采用广义饱和多孔介质模型描述,通过自编FORTRAN程序用集中质量显式有限元结合透射人工边界进行模拟,结构通过ANSYS中的隐式有限元进行分析。以某一核电结构为例,分析了0,−10,−20,−30,−40 m不同地下水位的五种场地上,土-基础-核电结构体系的动力响应。结果表明,地下水位对基础和结构的位移影响不大,对加速度的影响较大。Most of the nuclear power plants are built around the coastal or along the rivers.Below the underground water level,distribution of the water in the soil pore has a great influence on the seismic response of soil,which affects the response of the nuclear power plants.To analyze the effect of the underground water level on the seismic response of nuclear power plant,a saturated porous medium model considering the interaction of the saturated soil and structure is used in this paper.Firstly,the free field of the horizontal layered site of dry soil-saturated soil is obtained by the transfer matrix method,and the wave input of soil-structure interaction analysis is realized combined with the transmission boundary;Then,the partitioned parallel calculation method of soil-structure interaction is used to analyze the saturated soil-structure interaction.The soil with groundwater level is described by the generalized saturated porous medium model which is simulated by the lumped-mass explicit finite element combined with the transmission boundary using the self-programmed FORTRAN code,and the structure is analyzed by ANSYS using implicit finite element.Taking a nuclear power plant as an example,the dynamic response of soil-base-nuclear power plant system is analyzed in five sites with different groundwater levels of-10 m,-20 m,-30 m and-40 m,as well as pure saturated soil.The results show that the groundwater level has a great influence on the response of foundation and structure.For the calculation example in this paper,the results show that the groundwater level has little effect on the displacement of the foundation and structure,but has a great effect on the acceleration of the foundation and structure.

关 键 词：土-结相互作用 核电结构 地下水位 饱和多孔介质 集中质量显式有限元 人工边界 

分 类 号：TU435[建筑科学—岩土工程] TM623[建筑科学—土工工程]