考虑流固耦合效应的辽宁葠窝水库溢流坝段抗震性能分析  

Seismic Performance of Shenwo Reservoir in Liaoning Province Considering Dynamic Fluid-solid Interaction

作　　者：于程一 唐亮[1,2] 凌贤长[1] 宋曰良 王敏[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150090 [2]深部岩土力学与地下工程国家重点实验室,江苏徐州221116

出　　处：《防灾减灾工程学报》2014年第1期20-27,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家重点基础研究发展973项目(2012CB026104);国家自然科学基金项目(51108134;90815009;50378031;50178027)资助

摘　　要：针对辽宁葠窝水库混凝土重力坝抗震问题,采用耦合的拉格朗日-欧拉有限元分析技术,建立了可考虑库水-坝体-基岩动力耦合效应的典型溢流坝段抗震分析数值模型。模型中,采用等效一致粘弹性边界模拟基岩的人工截断边界;采用混凝土弥散裂缝本构模型模拟混凝土的动力特性。根据烈度与地震动之间的关系,确定了水库坝体抗震设计的输入加速度峰值。据此,分析了在不同季节水位变化条件下坝体地震反应的基本特性。研究表明:完好的辽宁葠窝水库混凝土重力坝溢流坝段能满足8度的抗震设防烈度要求。地震下溢流坝段峰值位移出现在胖坝和瘦坝的坝顶迎水面位置处,胖坝的动位移较瘦坝动位移大。胖坝在闸墩与溢流堰交接处出现了拉应力最大值。有库水条件下,瘦坝峰值拉应力出现在坝趾处,无库水条件下,瘦坝最大拉应力出现在溢流堰与闸墩交接处。To the question of Liaoning Shenwo concrete gravity dam seismic resistance, using the cou- pled Lagrangian-Eulerian finite element analysis technology, and then a typical seismic analysis numerical model of overflow dam considering reservoir water-dam-bedrock dynamic coupling effect was set up. In the numerical model, the equivalent uniform viscous-elastic boundary and the dispersion of concrete cracks constitutive model were used to simulate artificial truncated boundaries of the bedrock and the dy- namic performance of the concrete material, respectively. The input acceleration peak value of reservoir dam seismic design was determined according to the relationship between the intensity and ground mo- tion. The basic features of dam seismic response were analyzed under the conditions of water level changed in different seasons. The research shows, the earthquake fortification intensity of the undam- aged overflow dam reaches . No matter fat dam or thin dam, the peak dynamic displacement occurs at the crest into the water, but the value of the fat dam is bigger. For the fat dam, the maximum tensile stress appears at the junction of the pier and overflow weir. For the thin dam, the maximum tensile stress appears at the dam toe under the condition of the water in the reservoir, on the contrary, the max- imum tensile stress appears at the junction of the pier and overflow weir under the condition of no water in the reservoir.

关 键 词：抗震性能 流固耦合 葠窝水库溢流坝段 强震 

分 类 号：P315.9[天文地球—地震学]