文章摘要
何蕴龙,张劭华,石熙冉.胶凝砂砾石坝抗震特性及其地震作用计算方法[J].水利学报,2016,47(5):589-598
胶凝砂砾石坝抗震特性及其地震作用计算方法
Seismic behavior of Cement-Sand-Gravel dam and the calculation method of its seismic loads
投稿时间:2015-08-25  
DOI:10.13243/j.cnki.slxb.20150899
中文关键词: 胶凝砂砾石坝  动力特性  动力响应  地震惯性力  动水压力  地震作用计算方法
英文关键词: CSG dam  dynamic characteristics  seismic response  inertia force  hydrodynamic pressure  calculation method for seismic load
基金项目:长江水利委员会长江科学院开放研究基金项目(CKWV2014214/KY);国家自然科学基金项目(50679058)
作者单位
何蕴龙 武汉大学水资源与水电工程科学国家重点实验室, 湖北 武汉 430072 
张劭华 武汉大学水资源与水电工程科学国家重点实验室, 湖北 武汉 430072 
石熙冉 四川省水利水电勘测设计研究院, 四川 成都 610021 
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中文摘要:
      胶凝砂砾石坝具有独特的结构型式,且由低强度材料填筑而成,因此其动力特性和抗震性能具有独自的特征。采用时程动力法,计算分析了胶凝砂砾石坝的动力特性及地震响应规律,探讨了坝体材料、基岩刚度以及坝高变化对该类大坝地震动力响应的影响规律。研究结果表明,与同等高度混凝土重力坝相比这种坝的地震动力响应明显较小,即使在强震作用下,坝体地震动应力仍处于较低水平;胶凝砂砾石坝具有明显不同于重力坝的动力特性和地震响应规律,按现有重力坝拟静力法不能正确计算胶凝砂砾石坝的地震作用效应。在大量分析成果的基础上,研究提出适用于该坝的地震动态分布系数和动水压力分布系数计算方法,可方便用于坝体地震惯性力和坝面动水压力的计算,为采用拟静力法进行该坝抗震设计工作提供了参考依据。
英文摘要:
      As a new type of dam with Symmetric trapezoidal cross section, Cement-Sand-Gravel (CSG) dam is built up with CSG material, so its seismic resistance and dynamic characteristics are unique. To study its seismic safety, time history analysis method is taken in this paper. Based on FEM, the dynamic characteristics and seismic response of CSG dam are analyzed. The effects of stiffness of dam and bedrock and height of dam on its seismic responses are studied. The results show that the seismic responses of this dam are evident low compared with concrete gravity dam, and the seismic stresses within dam are not large enough to endanger dam safety even during strong earthquake. This type of dam has different seismic response and dynamic characteristic with gravity dam, so the calculation method of seismic loads for gravity dam cannot deal with CSG dam well. Based upon FEM analysis results,the methods for estimating seismic distribution coefficient and the hydrodynamic pressure coefficient, which is suitable for this new type of dam, are proposed to calculate the seismic loads and hydrodynamic pressure on this dam. The conclusions of this paper can provide reference for aseismic design of CSG dam.
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