超宽河谷上面板堆石坝地震响应特性分析

Seismic response analysis of a concrete faced rockfill dam on super wide valley

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.