基于黏弹性人工边界的高拱坝气幕隔震效果
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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.
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.
引文
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［14］陈江,张少杰,闵兴鑫.坝体-库水相互作用的流固耦合分析［J］.西南科技大学学报,2009,24（1）： 13-19 .
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［2］吴梵,刘润泉,董文才,等.船舶结构气幕减振的模型试验研究［J］.中国造船,2001,42（3）： 28-33 .
［3］Wu Fan,Dong Wencai,Guo Rixiu. Experimental investigation on vibration reduction of hull model by bubbly layer ［J］.Journal of Ship Mechanics,2002,6（3）： 76-84 .
［4］朱伯芳,高季章,陈祖煜,等.拱坝设计与研究［M］.北京： 中国水利水电出版社,2002 .
［5］Mraz Ed S J.It’s all in springs ［J］.Machine Design,1998（7）： 80-86 .
［6］Boyrthk B M,et al. Trail air cushion conformation on Keliobosh water-electricity station ［J］.Hydraulic Engineering Construction（Russian Publication）,1992（10）： 11-13 .
［7］Kenik B B,et al.Construction and installation of trial air cushion on arch dam of Miatelyn water-electricity station ［J］.Hydraulic Engineering Construction（Russian Publication）,1992 （10）： 9-10 .
［8］Boyrthk B M,et al.Arch-dam air cushion design of Qerky and Miatelyn power stations ［J］.Hydraulic Engineering Construction （Russian Publication）,1992 （10）： 6-9 .
［9］Lee Li.A seismic isolation measure for dams［C］//Proceeding of Earthquake Engineering Tenth World Conference.Balkema,Rotterdam,1992： 2247-2250 .
［10］何发祥.拱坝动水压力及气幕隔震技术研究［D］.成都： 四川大学,2000 .
［11］王忠.坝库相互作用及抗震技术研究［D］.成都： 四川大学,2001 .
［12］隆文非,刘浩吾 .大坝气幕隔震效果的数值模拟分析［J］.四川大学学报（工程科学版）,2005,37（2）： 38-42 .
［13］ 陈江,张少杰,刘浩吾.高拱坝气幕隔震效果的三维数值模拟［J］.振动与冲击,2009,28（11）： 134-138 .
［14］陈江,张少杰,闵兴鑫.坝体-库水相互作用的流固耦合分析［J］.西南科技大学学报,2009,24（1）： 13-19 .
［15］刘云贺,张伯艳,陈厚群.拱坝地震输入模型中黏弹性边界与黏性边界的比较［J］.水利学报,2006,37（6）： 857-862 .
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