特殊地形条件下面板堆石坝的动力反应特性及抗震能力研究  

Dynamic response properties and maximum anti-seismic capability of CFRD under special terrain condition

作　　者：杨超[1] 党发宁[1] 马宗源[1] 薛海斌[1] 刘盼盼 

机构地区：[1]西安理工大学岩土工程研究所,陕西西安710048 [2]陕西省电力设计院有限公司,陕西西安710054

出　　处：《地震工程与工程振动》2016年第1期83-90,共8页Earthquake Engineering and Engineering Dynamics

基　　金：陕西省科技统筹创新工程重点实验室项目(2014SZS15-Z01);水利部公益性行业科研专项基金资助项目(201501034-04)~~

摘　　要：受地形地质条件所限,抽水蓄能电站上水库的面板堆石坝工程通常不得不修筑在山腰、山坡等地形条件复杂的区域,特殊地形条件对面板堆石坝抗震安全性能的影响如何是值得关心的问题。采用基于ABAQUS的UMAT子程序二次开发的等价黏弹性模型,研究了此类特殊地形条件下面板堆石坝的动力反应特性,提出应该从防渗系统的安全性、坝坡动力稳定性以及地震最大残余变形三个方面综合评价大坝的极限抗震能力,研究了此类特殊地形条件下面板堆石坝的地震破坏模式。研究结果表明:大坝在地震荷载作用下的动加速度,动位移,动应力等动反应值均较小,坝体竖向最大残余变形值小于坝高的1%,大坝具有较强的抗震能力;大坝沿顺河方向的最大动位移出现在坝高3/4靠近下游侧的坝坡处,倾斜的坝基地形会影响大坝的动力反应特性;倾斜坝基地形条件下大坝的破坏模式以防渗系统破坏和下游坝坡失稳为主,其极限抗震能力为0.50 g^0.58 g。Limited by the topography and geological condition, the main dam of pumped-storage power station always has to be built under some special terrain conditions and it＇ s dynamic safety was still concerned. The dy- namic response properties under this kind of topography condition were to be analyzed by using the equivalent visco- elastic model based on the UMAT subroutine of ABAQUS. The maximum anti-seismic capability of CFRD should be considered by the safety of anti-seepage system, the downstream dam slope instability and the value of permanent deformation three parts. The results of this study show that the dynamic acceleration, the dynamic displacement and the dynamic stress of the dam were not strong. The dam with a nice aseismic behavior for the biggest permanent de- formation was smaller than the 1% of the dam height. The inclined dam foundation can influence with the dynamic response properties of CFRD, and the maximum dynamic displacement towards the river direction locations on downstream slope near 3/4 of the dam height. The failure forms of high CFRD under the inclined dam foundation mainly include the broken of anti-seepage system and the downstream dam slope instability. The maximum anti-seismic capability of the dam is 0. 5 g - 0. 58 g.

关 键 词：特殊地形条件 面板堆石坝 动力反应特性 破坏模式 极限抗震能力 

分 类 号：TV641.4[水利工程—水利水电工程] TU41[建筑科学—岩土工程]