面板堆石坝坝顶加速度沿坝轴线分布规律
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摘要
对面板堆石坝进行三维动力反应计算分析,采用等价线性化模型以不同坝体高度、不同河谷形状为对象,研究了输入不同地震波坝体的反应。结果表明,在坝高相同、基础输入加速度不变情况下,随河谷宽度增加,坝顶坝轴线最大加速度位置由中间向两岸对称移动;对狭窄河谷,最大加速度在坝轴线中间坝顶部位,对宽阔河谷,最大加速度在靠近两岸的部位,这一结果否定了以往对宽河谷采用二维动力计算结果的做法。进而提出对高面板堆石坝,地震反应除应给出沿坝高的地震放大系数外,还应给出沿坝轴线的地震放大系数。
3-D dynamical response analysis of concrete-faced rockfill dam is presented.Using equivalent-linear model,for different dam heights and different shapes of river valley,the responses of dam subjected to different seismic wave inputs have been studied.The results show that on the condition of the same dam height and the base acceleration excitations unchanged,with the increase of the river valley width,the position of the maximum acceleration on the axis of the top moves from the middle to the riversides symmetrically.To the narrow river valley,the position of the maximum acceleration which occurs near the riversides to the wide valley is on the middle of the axis at the top.The result negates the application of 2-D dynamical computation for wide valleys,and shows that for the seismic response of high concrete-faced rockfill dams,the seismic amplification factor along the axis should be given,except for that along the dam heights.
3-D dynamical response analysis of concrete-faced rockfill dam is presented.Using equivalent-linear model,for different dam heights and different shapes of river valley,the responses of dam subjected to different seismic wave inputs have been studied.The results show that on the condition of the same dam height and the base acceleration excitations unchanged,with the increase of the river valley width,the position of the maximum acceleration on the axis of the top moves from the middle to the riversides symmetrically.To the narrow river valley,the position of the maximum acceleration which occurs near the riversides to the wide valley is on the middle of the axis at the top.The result negates the application of 2-D dynamical computation for wide valleys,and shows that for the seismic response of high concrete-faced rockfill dams,the seismic amplification factor along the axis should be given,except for that along the dam heights.
引文
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[9]李俊杰,韩国城,孔宪京.关门山面板堆石坝三维地震反应分析和研究[J].水利学报,1994,2(2):76-83.LI Jun-jie,HAN Guo-cheng,KONG Xian-jing.3-D seismic response of Guanmenshan concrete faced rockfill dam[J].Journal of Hydraulic Engineering,1994,2(2):76-83.
[10]孔宪京,娄树莲,邹德高,等.筑坝堆石料的等效动剪切模量与等效阻尼比[J].水利学报,2001,32(8):20-25.KONG Xian-jing,LOU Shu-lian,ZOU De-gao,et al.The equivalent dynamic shear modulus and equivalent damping ratio of rockfill material for dam[J].Journal of Hydraulic Engineering,2001,32(8):20-25.
[2]陈厚群,徐泽平,李敏.汶川大地震和大坝抗震安全.水利学报,2008,39(10):1158-1167.CHEN Hou-qun,XU Ze-ping,LEE Min.Wenchuan Earthquake and seismic safety of large dams[J].Journal of Hydraulic Engineering,2008,39(10):1158-1167.
[3]赵剑肯,常亚屏,陈宁.加强高土石坝抗震研究的现实意义及工作展望[J].世界地震工程,2004,20(1):95-99.ZHAO Jing-ming,CHANG Ya-ping,CHEN Ning.Significance and prospects about earthquake resistant studies of high earth-rockfill dams[J].World Earthquake Engineering,2004,20(1):95-99.
[4]栾茂田,李湛,范庆来.土石坝拟静力抗震稳定性分析与坝坡地震滑移量估算[J].岩土力学,2007,28(2):224-230.LUAN Mao-tian,LI Zhan,FAN Qing-lai.Analysis and evaluation of pseudo-static seismic stability and seism-induced sliding movement of earth-rock dams[J].Rock and Soil Mechanics,2007,28(2):224-230.
[5]电力部中南勘测设计研究院.DL5073-1997水工建筑物抗震设计规范[S].北京:中国电力出版社,1998.
[6]张锐,迟世春,林皋.高土石坝坝坡抗震稳定分析的研究[J].水利发电学报,2008,27(4):83-88.ZHANG Rui,CHI SHi-chun,LIN Gao.Research on slope seismic stability analysis of high earth-rock dams[J].Journal of Hydroeletric Engineering,2008,27(4):83-88.
[7]张锐,迟世春,林皋.地震加速度动态分布及对高土石坝坝坡抗震稳定的影响[J].岩土力学,2008,29(4):1072-1076.ZHANG Rui,CHI SHi-chun,LIN Gao.Discussion on seismic coefficient of high earth-rock dams and its influence on dam slope seismic stability[J].Rock and Soil Mechanics,2008,29(4):1072-1076.
[8]肖伟,李泰来,黄臣虎.堆石坝地震响应和地基液化分析[J].岩土力学,2008,29(增刊):155-160.XIAO Wei,LI Tai-lai,HUANG Chen-hu.Seismic response and foundation liquefaction analysis of rockfill dam[J].Rock and Soil Mechanics,2008,29(Supp.):155-160.
[9]李俊杰,韩国城,孔宪京.关门山面板堆石坝三维地震反应分析和研究[J].水利学报,1994,2(2):76-83.LI Jun-jie,HAN Guo-cheng,KONG Xian-jing.3-D seismic response of Guanmenshan concrete faced rockfill dam[J].Journal of Hydraulic Engineering,1994,2(2):76-83.
[10]孔宪京,娄树莲,邹德高,等.筑坝堆石料的等效动剪切模量与等效阻尼比[J].水利学报,2001,32(8):20-25.KONG Xian-jing,LOU Shu-lian,ZOU De-gao,et al.The equivalent dynamic shear modulus and equivalent damping ratio of rockfill material for dam[J].Journal of Hydraulic Engineering,2001,32(8):20-25.
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