基于黏弹性人工边界的高拱坝气幕隔震效果  

Isolation effect of air-cushion in high arch dams considering viscous-spring artificial boundary condition

作　　者：张少杰[1] 陈江[2] 张元泽[1] 刘浩吾[1] 

机构地区：[1]四川大学水利水电学院,四川成都610065 [2]中国水电顾问集团昆明勘测设计研究院科学研究分院,云南昆明650033

出　　处：《水利学报》2011年第2期238-244,共7页Journal of Hydraulic Engineering

基　　金：国家自然科学基金重大研究计划资助项目(90715026)

摘　　要：基于气-液-固三相耦合理论模型,采用动力有限元时程分析的数值仿真方法,对锦屏一级拱坝进行了气幕隔震效果的三维数值模拟。引入黏弹性人工边界的基本原理,在坝基截断边界添加弹簧-阻尼单元以考虑无限地基的辐射阻尼影响。数值仿真结果表明:气幕显著降低了上游坝面的动水压力,气幕厚度越大,隔震效果越好。与无气幕时相比,气幕厚度为1、2和3m时,动水压力分别降低了58.2%、71.5%和81.9%,位移及应力反应也相应降低。Based on the theoretical model of gas-liquid-solid the 3D numerical simulation for the Jinping Arch Dam was carried out to discuss the effects of air-cushion isolation by using the dynamic finite element analysis.Based on the basic theory of viscous-spring artificial boundary condition,spring-damping elements were added to truncated boundary of dam foundation to consider the influence of radiation damping.Numerical simulation results show that the air-cushion reduces the hydrodynamic pressure significantly.The thicker the air-cushion,the better the isolation effects will be.Comparing with the case of none air-cushion,the hydrodynamic pressure decreases by 58.2%,71.5%,81.9% for air cushion thickness 1m thick,2m and 3m respectively.Meanwhile,the displacement and stress response also decreases accordingly.

关 键 词：动水压力 气幕隔震 辐射阻尼 高拱坝 流固耦合 

分 类 号：TV642[水利工程—水利水电工程]