某核电站导流堤地基液化及地震永久变形分析
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摘要
在地震反应分析中常采用总应力分析法,但总应力法没有考虑孔隙水压力的变化规律和液化随时间的发展过程。基于二维有效应力动力分析方法,结合Biot动力固结理论,采用自行开发的有效应力动力分析程序对某核电站导流堤地基进行液化分析,给出在地震作用下砂土层的液化范围,并计算出永久变形。所得结论可以给类似工程提供理论指导。
In seismic response analysis,total stress method is adopted mostly,but variation of the pore water pressure and the development process of the liquefaction are not considered in this method.Based on the dynamic analysis method of two-dimensional effective stress,combined with dynamic consolidation theory of Boit,the foundation liquefaction analysis on the diversion dike in a nuclear power plant is performed by using the effective stress dynamic analysis program which was developed by authors.The liquefied range under seismic motion is given,as well as the permanent deformation.The conclusion can provide theoretical guidance for similar project.
In seismic response analysis,total stress method is adopted mostly,but variation of the pore water pressure and the development process of the liquefaction are not considered in this method.Based on the dynamic analysis method of two-dimensional effective stress,combined with dynamic consolidation theory of Boit,the foundation liquefaction analysis on the diversion dike in a nuclear power plant is performed by using the effective stress dynamic analysis program which was developed by authors.The liquefied range under seismic motion is given,as well as the permanent deformation.The conclusion can provide theoretical guidance for similar project.
引文
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[2]徐志英,沈珠江.地震液化的有效应力二维动力分析方法[J].河海大学学报(自然科学版),1981,(3):1-14.
[3]朱百里,沈珠江.计算土力学[M].上海:上海科学技术出版社,1990.
[4]汪闻韶.饱和砂土振动孔隙水压力试验研究[J].水利学报,1962,(2):36-47.
[5]谢定义,张建民.往返荷载下饱和砂土强度变形瞬态变化的机理[J].土木工程学报,1987,20(3):50-70.
[6]Ishihara K.Undrained deformation and liquefaction of sand under cyclic stress[J].Soils and Foundation,1975,15(1):29-44.
[7]周健,白冰,徐建平.土动力学理论与计算[M].北京,中国建筑工业出版社,2001.
[8]国家地震局.GB50267-97核电厂抗震设计规范[S].北京:国家地震局,1997.
[9]中华人民共和国交通部.水运工程抗震设计规范[S].北京:人民交通出版社,1999.
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