【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。更多还原

【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-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.更多还原