地震动波动输入方法在高土石坝动力分析中的应用研究
|
摘要
地震动输入方法是高土石坝动力分析的重要方面,传统的一致性地震动输入方法难以合理反映地震波的"行波效应"和"地基辐射阻尼"现象,本文将地震动波动输入方法引入了土石坝有限元静动力分析程序TOSS3D,通过与解析解比较,验证了开发程序的正确性.以拟建新疆247m高大石峡砂砾石面板坝为依托工程,对比分析了一致性输入和非一致性地震动输入情况下大坝加速度反应、动位移、坝体残余变形以及防渗体动应力的差异.结果表明,波动输入方法由于考虑了地基的辐射阻尼现象,其计算所得的加速度放大系数、面板动应力以及坝体残余变形均较一致性输入小.研究认为,采用波动输入方法更有助于评估大坝的实际抗震能力,对于200～300m级高土石坝地震分析应采用能够反映土石坝坝体与基岩之间相互作用的数值模型.
The ground motion input method is one of the most important aspects in dynamic analysis of high earth-rock dams.To simulate an earth-rock dam earthquake,the traditional uniform excitation method is easy to execute,however,it can not reasonably reflect the phenomenon of"traveling wave effect"and"radiation damping of infinite foundation".In this paper,the earthquake wave motion input method is incorporated into the TOSS3 DFEM program.The earthquake wave motion input method can overcome shortcomings of the uniform excitation method;the"traveling wave effect"and"radiation damping of infinite foundation"can be both reflected.The FEM program is also verified by comparing with the analytical solutions using the free field wave propagation program.The 247 mhigh Dashixia dam in Xinjiang Autonomous Region of China is analyzed;the results of the acceleration response,dynamic displacement,residual deformation and dynamic stress of the slab are all compared with the uniform excitation method.It can be concluded that the results of the earthquake wave motion input method are smaller than that of the uniform excitation methodin acceleration magnification factor,dynamic stress of the concrete slab and the residual deformation.Therefore,when adopting the earthquake wave motion input method,actual seismic capacity of the dam body can be predicted more accurate.For analyzing the high earth-rock dams of 200-300 m,the numerical model considering interaction between dam body and bedrock should be adopted.
The ground motion input method is one of the most important aspects in dynamic analysis of high earth-rock dams.To simulate an earth-rock dam earthquake,the traditional uniform excitation method is easy to execute,however,it can not reasonably reflect the phenomenon of"traveling wave effect"and"radiation damping of infinite foundation".In this paper,the earthquake wave motion input method is incorporated into the TOSS3 DFEM program.The earthquake wave motion input method can overcome shortcomings of the uniform excitation method;the"traveling wave effect"and"radiation damping of infinite foundation"can be both reflected.The FEM program is also verified by comparing with the analytical solutions using the free field wave propagation program.The 247 mhigh Dashixia dam in Xinjiang Autonomous Region of China is analyzed;the results of the acceleration response,dynamic displacement,residual deformation and dynamic stress of the slab are all compared with the uniform excitation method.It can be concluded that the results of the earthquake wave motion input method are smaller than that of the uniform excitation methodin acceleration magnification factor,dynamic stress of the concrete slab and the residual deformation.Therefore,when adopting the earthquake wave motion input method,actual seismic capacity of the dam body can be predicted more accurate.For analyzing the high earth-rock dams of 200-300 m,the numerical model considering interaction between dam body and bedrock should be adopted.
引文
[1]陈厚群,吴胜兴,党发宁.高拱坝抗震安全[M].北京:中国电力出版社,2012.
[2]陈厚群.坝址地震动输入机制探讨[J].水利学报,2006,37(12):1417-1423.
[3]廖振鹏.工程波动理论导论[M].北京:科学出版社,2002.
[4] J Lysmer.Finite Dynamic Model for Infinite Media[J].Proc of Asce,1969,95(4):859-878.
[5] Andrew John Deeks,Mark Felton Randolph.Axisymmetric Time-Domain Transmitting Boundaries[J].Journal of Engineering Mechanics,1994,120(1):25-42.
[6]刘晶波,谷音,杜义欣.一致粘弹性人工边界及粘弹性边界单元[J].岩土工程学报,2006,28(9):1070-1075.
[7]刘晶波,李彬.三维黏弹性静-动力统一人工边界[J].中国科学:技术科学,2005,35(9):966-980.
[8]刘晶波,吕彦东.结构-地基动力相互作用问题分析的一种直接方法[J].土木工程学报,1998,31(3):55-64.
[9]刘晶波,王振宇,杜修力,等.波动问题中的三维时域粘弹性人工边界[J].工程力学,2005,22(6):46-51.
[10]杜修力,陈厚群,侯顺载.拱坝-地基系统的三维非线性地震反应分析[J].水利学报,1997(8):7-14.
[11]杜修力,赵密.基于黏弹性边界的拱坝地震反应分析方法[J].水利学报,2006,37(9):1063-1069.
[12]杜修力,赵密,王进廷.近场波动模拟的人工应力边界条件[J].力学学报,2006,38(1):49-56.
[13]张伯艳,李德玉,涂劲.乌东德拱坝非线性地震反应分析[J].水力发电学报,2009,28(5):62-67.
[14]孔宪京.混凝土面板堆石坝抗震性能[M].北京:科学出版社,2015.
[15]周晨光,孔宪京,邹德高,等.地震波动输入方法对高土石坝地震反应影响研究[J].大连理工大学学报,2016,56(4):382-389.
[16]Liu Jingbo,Du Yixin,DU Xiuli,et al.3Dviscous-spring artificial boundary in time domain[J].Earthquake Engineering&Engineering Vibration,2006,5(1):93-102.
[17]岑威钧,袁丽娜,王帅.非一致地震动输入下高面板坝地震反应特性[J].水利水运工程学报,2016(4):126-132.
[18]朱百里,沈珠江.计算土力学[M].上海:上海科学技术出版社,1990.
[19]沈珠江,徐刚.堆石料的动力变形特性[J].水利水运工程学报,1996(2):143-150.
[2]陈厚群.坝址地震动输入机制探讨[J].水利学报,2006,37(12):1417-1423.
[3]廖振鹏.工程波动理论导论[M].北京:科学出版社,2002.
[4] J Lysmer.Finite Dynamic Model for Infinite Media[J].Proc of Asce,1969,95(4):859-878.
[5] Andrew John Deeks,Mark Felton Randolph.Axisymmetric Time-Domain Transmitting Boundaries[J].Journal of Engineering Mechanics,1994,120(1):25-42.
[6]刘晶波,谷音,杜义欣.一致粘弹性人工边界及粘弹性边界单元[J].岩土工程学报,2006,28(9):1070-1075.
[7]刘晶波,李彬.三维黏弹性静-动力统一人工边界[J].中国科学:技术科学,2005,35(9):966-980.
[8]刘晶波,吕彦东.结构-地基动力相互作用问题分析的一种直接方法[J].土木工程学报,1998,31(3):55-64.
[9]刘晶波,王振宇,杜修力,等.波动问题中的三维时域粘弹性人工边界[J].工程力学,2005,22(6):46-51.
[10]杜修力,陈厚群,侯顺载.拱坝-地基系统的三维非线性地震反应分析[J].水利学报,1997(8):7-14.
[11]杜修力,赵密.基于黏弹性边界的拱坝地震反应分析方法[J].水利学报,2006,37(9):1063-1069.
[12]杜修力,赵密,王进廷.近场波动模拟的人工应力边界条件[J].力学学报,2006,38(1):49-56.
[13]张伯艳,李德玉,涂劲.乌东德拱坝非线性地震反应分析[J].水力发电学报,2009,28(5):62-67.
[14]孔宪京.混凝土面板堆石坝抗震性能[M].北京:科学出版社,2015.
[15]周晨光,孔宪京,邹德高,等.地震波动输入方法对高土石坝地震反应影响研究[J].大连理工大学学报,2016,56(4):382-389.
[16]Liu Jingbo,Du Yixin,DU Xiuli,et al.3Dviscous-spring artificial boundary in time domain[J].Earthquake Engineering&Engineering Vibration,2006,5(1):93-102.
[17]岑威钧,袁丽娜,王帅.非一致地震动输入下高面板坝地震反应特性[J].水利水运工程学报,2016(4):126-132.
[18]朱百里,沈珠江.计算土力学[M].上海:上海科学技术出版社,1990.
[19]沈珠江,徐刚.堆石料的动力变形特性[J].水利水运工程学报,1996(2):143-150.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |