强震作用下苏家河口面板堆石坝动力响应  

Dynamic response analysis of Sujiahekou concrete-face rock-fill dam under strong earthquake

作　　者：王乐华[1,2] 邓华锋[1,2] 汤开宇[1] 朱敏[1] 彭云枫 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [2]三峡地区地质灾害与生态环境湖北省协同创新中心,湖北宜昌443002

出　　处：《水利水电科技进展》2014年第6期7-12,26,共7页Advances in Science and Technology of Water Resources

基　　金：湖北省教育厅科学研究计划基金(Q20091301);国家重点基础研究发展计划(973计划)(2012CB426502);水利部公益性行业科研专项(201401029)

摘　　要：为了分析苏家河口面板堆石坝坝体在强震作用下的安全性能,建立了面板堆石坝的整体三维有限元模型和面板、趾板子模型,采用Hardin-Drnevich本构模型,对坝体在强震作用下的动力响应规律进行了详细分析。结果表明,在0.38g的强震作用下,面板堆石坝的加速度、动位移、动应力以及垂直缝和周边缝的动变形分布符合一般规律,未发现有特殊不利的现象,整体上满足抗震要求,但是坝体顶部振动的"鞭梢"效应比较明显,在3/4坝高以上坝顶区域以及靠近下游坡面处存在较小的拉应力区域。建议加强3/4坝高以上区域面板、坝顶及下游护坡的抗震工程措施,以保证大坝在强震下的安全。As the Sujiahekou concrete-face rock-fill dam （ CFRD） is located next to the strong earthquake activity belt, the analyze and evaluation of the safety performance of the dam should be assessed. To archive this goal, this study established the three-dimensional finite element model of the CFRD and corresponding sub model of concrete face and toe board. We used the Hardin-Drnevich constitutive model to calculate and analyze the dynamic response rules of dam＆#39;s body under strong earthquakes in detail. The results show that under the action of 0.38g earthquake, the acceleration, dynamic displacement, dynamic stress, and dynamic deformation of vertical seam and peripheral joint distribution conform to the general rules. There is no special adverse phenomenon;The CFRD can meet seismic requirements. However, the whipping effect of the dam body vibration is obvious and there is a small tensile stress area in 3/4 dam high above crest and areas close to the downstream slope. Therefore, seismic engineering measures, strengthening the 3/4 dam high above area panel, dam crest and downstream slope, have been suggested to ensure the safety of the dam in earthquake.

关 键 词：面板堆石坝 三维有限元模型 强震 动力响应 苏家河口 

分 类 号：TV641.43[水利工程—水利水电工程]