纳子峡面板砂砾石坝地震永久变形有限元分析
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摘要
针对纳子峡面板砂砾石坝实际情况,采用三维非线性动力有限元法,建立了大坝的三维有限元模型,计算了大坝在设计地震作用下的地震响应。根据面板坝土石料的三轴试验结果,选用坝料的残余应变模式,建立了同时计入残余体应变和残余剪应变的面板砂砾石坝地震永久变形计算模式,应用应变势概念及其相应的整体变形计算方法,计算预测了纳子峡面板坝的地震永久变形,分析了坝体地震永久变形的量值和分布规律。结果表明,大坝在7.5度地震作用下具有较好的抗震能力,其永久变形能够满足工程需要。
According to the actual situation of Nazixia facing sand-gravel dam,and adopting the 3-D nonlinear dynamic finite element method,a 3-D finite element model is set up to calculate the seismic response of the dam under designed earthquake action.Based on the results of triaxial test,the dam material's residual strain mode is chosen to set up the calculation model for the earthquake-induced permanent deformation of facing sand-gravel dams through considering both residual shear strain and residual volumetric strain.Then the earthquake permanent deformation of Nazixia facing sand-gravel dam is predicted,and the permanent deformation's magnitude and distribution law of the dam is analyzed.The results show that the dam has a good aseismic capacity,which could meet the needs of the engineering's permanent deformation.
According to the actual situation of Nazixia facing sand-gravel dam,and adopting the 3-D nonlinear dynamic finite element method,a 3-D finite element model is set up to calculate the seismic response of the dam under designed earthquake action.Based on the results of triaxial test,the dam material's residual strain mode is chosen to set up the calculation model for the earthquake-induced permanent deformation of facing sand-gravel dams through considering both residual shear strain and residual volumetric strain.Then the earthquake permanent deformation of Nazixia facing sand-gravel dam is predicted,and the permanent deformation's magnitude and distribution law of the dam is analyzed.The results show that the dam has a good aseismic capacity,which could meet the needs of the engineering's permanent deformation.
引文
[1]温续余,沈振中,吕生玺.九甸峡混凝土面板堆石坝应力变形性态研究[J].河海大学学报(自然科学版),2005,33(增):42-46.
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[2]迟世春,顾淦臣.混凝土面板堆石坝的抗震稳定分析[J].东北水利水电,1995,(11):3-5.
[3]沈振中,马明,吕生玺.九甸峡混凝土面板堆石坝抗震稳定性分析[C]//中国水力发电工程学会,河海大学.首届全国水工抗震防灾学术会议论文集,2006:273-278.
[4]戴永志,顾淦臣.黄河公伯峡混凝土面板堆石坝三维非线性分析[J].红水河,2001,20(4):37-41.
[5]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.华东水利学院学报,1980,(4):59-75.
[6]朱晟,闻世强,黄亚梅.一座200 m级高面板坝的变形和应力计算研究[J].河海大学学报(自然科学版),2003,31(6):631-634.
[7]卢廷浩,邵松桂.天生桥一级水电站面板堆石坝三维非线性有限元分析[J].红水河,1996,15(4):20-22.
[8]赵剑明,汪闻韶,戚蓝.混凝土面板堆石坝面板地震反应分析[J].岩石力学与工程学报,2001,20(s2).
[9]顾淦臣,迟世春.高面板堆石坝动力反应分析和抗震稳定分析方法[R].南京:河海大学,1994.
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