| 张少杰,陈 江,张元泽,刘浩吾.基于黏弹性人工边界的高拱坝气幕隔震效果[J].水利学报,2011,42(2): |
| 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 |
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| DOI： |
| 中文关键词: 动水压力 气幕隔震 辐射阻尼 高拱坝 流固耦合 |
| 英文关键词: hydrodynamic pressure air-cushion isolation radiation damping high arch dam fluid-solid coupling |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| Abstract：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-cush?ion，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. |
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