超宽河谷上面板堆石坝地震响应特性分析
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摘要
国内外未见有关在宽高比超过8.0的河谷上建高面板堆石坝的相关报道。文中采用非线性有限单元法,对一座拟建中的河谷宽高比为9.5的139 m高的混凝土面板堆石坝进行了地震响应分析,重点分析大坝的绝对加速度、动位移和动应力等动力响应情况。分析结果表明,在现有设计条件下,由于河谷宽高比较大,大坝在8度地震作用下地震响应不强烈,但坝顶出现明显的鞭稍效应,需采取相应的抗震工程措施。
The relevant report about the constructed concrete faced rockfill dam(CFRD) with the ratio of valley width to height is more than 8.0 in valley has not seen at home and abroad.The 3D non-linear FEM methed is applied to analyze the dynamic response of CFRD with a dam,of which the height is 139 m and the valley width to height ratio is 9.5.The distribution characters of absolute acceleration,dynamic displacement,and dynamic stress are emphasised on.The calculation results show that the dynamic response of the dam is not strong because of the super wide valley,but dynamic response of the bottom of the dam is strong under the earthquake with intansity of 8 degree on the present design condition.Therefore,the earthquake resistant constructional measures should be adopted for the dam.
The relevant report about the constructed concrete faced rockfill dam(CFRD) with the ratio of valley width to height is more than 8.0 in valley has not seen at home and abroad.The 3D non-linear FEM methed is applied to analyze the dynamic response of CFRD with a dam,of which the height is 139 m and the valley width to height ratio is 9.5.The distribution characters of absolute acceleration,dynamic displacement,and dynamic stress are emphasised on.The calculation results show that the dynamic response of the dam is not strong because of the super wide valley,but dynamic response of the bottom of the dam is strong under the earthquake with intansity of 8 degree on the present design condition.Therefore,the earthquake resistant constructional measures should be adopted for the dam.
引文
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[6]刘小生,王钟宁,赵剑明.面板堆石坝振动模型试验及动力分析研究[J].水利学报,2002,33(2):29-36.
[7]岑威钧,顾淦臣,隋世军.深厚黄土覆盖层上土石坝地震响应特性分析[J].防灾减灾工程学报,2009,29(1):51-56.
[2]朱压林,孔宪京,丁克伟,等.高土石坝的研究进展[J].安徽建筑工业学院院报,2009,17(3):1-6.
[3]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(s2):423-428.
[4]顾淦臣.土石坝地震工程[M].南京:河海大学出版社,1989.
[5]孔宪京,邹德高,邓学晶.高土石坝综合抗震措施及其效果的验算[J].水利学报,2006,37(12):1489-1495.
[6]刘小生,王钟宁,赵剑明.面板堆石坝振动模型试验及动力分析研究[J].水利学报,2002,33(2):29-36.
[7]岑威钧,顾淦臣,隋世军.深厚黄土覆盖层上土石坝地震响应特性分析[J].防灾减灾工程学报,2009,29(1):51-56.
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