哈达山工程土坝地震反应三维有限元分析
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摘要
以哈达山水利枢纽坝址区地震为例,采用三维非线性有限元法建立了土坝和坝基的三维非线性有限元模型,并根据提供的地震动加速度曲线采用动力时程分析法对大坝进行地震反应分析。结果表明,设计地震作用下坝体的加速度、位移和应力反应均小,地震永久变形不明显,约为最大坝高(含坝基覆盖层)的0.10%,整体稳定性满足要求,设计方案合理。
The basic seismic intensity in dam site of Hadashan water project is eight degree.The scheme of reinforcement with cover-weight and vibroflotation pile is adopted.By the use of 3-D nonlinear finite element method,the FEM model of dam and its foundation is built.According to the seismic acceleration curve provided,the seismic response behavior is researched by dynamic time-history method.The analysis shows that,the acceleration response,the displacement response and the stress response are small under design earthquake action.The earthquake induced permanent deformation is small,and its value is about 0.10% of the maximum dam height(including foundation overburden).The global stability of dam satisfies the requirement.The design proposal is technically feasible.
The basic seismic intensity in dam site of Hadashan water project is eight degree.The scheme of reinforcement with cover-weight and vibroflotation pile is adopted.By the use of 3-D nonlinear finite element method,the FEM model of dam and its foundation is built.According to the seismic acceleration curve provided,the seismic response behavior is researched by dynamic time-history method.The analysis shows that,the acceleration response,the displacement response and the stress response are small under design earthquake action.The earthquake induced permanent deformation is small,and its value is about 0.10% of the maximum dam height(including foundation overburden).The global stability of dam satisfies the requirement.The design proposal is technically feasible.
引文
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[3]崔娟,沈振中,凌春海.官帽舟沥青混凝土心墙混合坝应力变形分析[J].水电能源科学,2008,26(2):72-75
[4]邱乾勇,沈振中,王伟.深覆盖层对面板堆石坝面板变形和应力的影响[J].水力发电,2008,34(1):38-41
[5]吕生玺,沈振中,温续余.九甸峡混凝土面板堆石坝地震反应特性研究[J].中国农村水利水电,2008(2):88-91
[6]徐志英,沈珠江.高尾矿坝的静、动力非线性分析与地震稳定性[J].华东水利学院学报,1980(4):1-17
[7]祝艳凤.哈达山水利枢纽工程粘土均质坝筑坝材料静、动力特性实验研究报告[R].大连:大连理工大学,2009.
[8]赵剑明,常亚屏,陈宁.高心墙堆石坝地震变形与稳定分析[J].岩土力学,2004,25:423-428
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