纳子峡面板砂砾石坝地震反应特性有限元分析
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摘要
采用三维非线性动力有限元法,对纳子峡水利枢纽面板砂砾石坝的地震反应特性进行了计算分析,获得了该坝在设计地震作用下的动力反应,包括坝体和面板的加速度反应、位移反应、应力反应,以及周边缝和面板接缝的位移反应等。在50 a超越概率10%地震作用下,坝体顺河向的最大加速度反应为6.8 m/s2,位移反应为59 mm,剪应力反应为238 kPa;周边缝和面板缝的位移反应很小。计算分析表明,该坝的抗震稳定性满足规范要求,该坝的设计在技术上是合理的。
By use of the 3-dimensional dynamic non-linear FEM, the earthquake response behavior of Nazixia facing sand-gravel dam is researched in detail.The dynamic response properties of the dam are obtained under the designed earthquake action,such as the acceleration response,displacement response,stress response of the dam body and concrete face,as well as the displacement response of the peripheral joints and slab joints.Under the earthquake role of probability exceedance 10% in 50 years,the maximum acceleration reaction,displacement reaction and shear stress reaction of the dam body are 6.8 m/s2,59 mm and 238 kPa respectively,and the displacement reaction of the peripheral joint and slab joint is very little.The calculation and analysis show that the seismic stability of the dam body could meet the specifications,the design of the dam body is reasonable in technique.
By use of the 3-dimensional dynamic non-linear FEM, the earthquake response behavior of Nazixia facing sand-gravel dam is researched in detail.The dynamic response properties of the dam are obtained under the designed earthquake action,such as the acceleration response,displacement response,stress response of the dam body and concrete face,as well as the displacement response of the peripheral joints and slab joints.Under the earthquake role of probability exceedance 10% in 50 years,the maximum acceleration reaction,displacement reaction and shear stress reaction of the dam body are 6.8 m/s2,59 mm and 238 kPa respectively,and the displacement reaction of the peripheral joint and slab joint is very little.The calculation and analysis show that the seismic stability of the dam body could meet the specifications,the design of the dam body is reasonable in technique.
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]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.
[3]顾淦臣.土石坝地震工程[M].南京:河海大学出版社,1989.
[4]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.
[5]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]//首届全国水工抗震防灾学术会议论文集,2006:273-278.
[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]朱晟,闻世强,黄亚梅.一座200m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.
[8]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.
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