库水对高面板堆石坝动力反应的影响
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摘要
采用基于势流体理论的坝水流固耦合有限元分析方法,研究高面板堆石坝坝水动力耦合系统的动力反应特性,对库水模拟长度、上游坝坡坡度、两岸坡度和地震加速度等要素进行敏感性分析,探讨库水分布规律及对高面板堆石坝动力反应的影响.结果表明:由于库水的存在,坝体的自振频率有所降低;坝面动水压力中部大四周小,沿坝高大致呈抛物线分布,计算模型中"库水长度"取3倍坝高可满足精度要求;河谷几何特性对坝体动力反应有较为明显的影响;动水压力随上游坝坡坡度的减缓而变小,两岸岸坡和上游坝坡对大坝加速度反应的影响规律相似;地震峰值加速度对坝库耦合系统动力响应影响显著.
Based on potential flow theory,fluid-structure interaction finite element method is used to analyze the concrete face rockfill dam(CFRD)-water coupling system,with emphasis on sensitivities of the length of the reservoir,rario of upstream dam slope,ratio of river bank,seismic peak acceleration and other factors.The results show that the dam's natural frequency decreases due to the existence of reservoir water;hydrodynamic pressure is parabolic distribution along the height;taking the reservoir water length as the three times of the dam height,is sufficient to ensure the accuracy of the calculation results;the geometric characteristics of the valley have obvious influence on the dam dynamic response;the hydrodynamic pressures become smaller with slope mitigation;the dam upstream slope and river banks have similar influence on acceleration,The seismic peak acceleration has a great influence on seismic response of the damwater coupling system.
引文
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