【摘要】 采用三维有限元分析方法,对100 m以上的均质堆石坝进行了动力反应分析,研究了沿大坝高度方向和坝纵轴线方向的加速度分布规律,分析了坝高、动剪切模量、坝坡坡度、河谷宽高比、地震峰值加速度、地震波对加速度放大倍数的影响。结果表明:高土石坝表现出明显的三维动力效应,坝高、动剪切模量、坝坡坡度等因素对大坝三维加速度反应均有不同程度的影响;所有工况中地震加速度均在坝高4/5以上的河谷中部放大明显,现行规范建议的加速度分布规律不符合高坝的反应特性。根据计算结果,建议了大坝坝坡抗震加固的范围。更多还原

【Abstract】 In order to study the acceleration distribution of high rock-fill dam,the dynamic response of homogeneous earth-rock dams over 100m were analyzed with three dimensional(3D) finite element method considering the height and slope of the dam,aspect ratios of river valley,dynamic shear modulus,peak acceleration and seismic waves.The results show that the 3D effect of dynamic response is apparent.The acceleration is significantly enlarged in the middle of river bed of the dam over 4/5 height and recommended distribution of the acceleration by the current code is inconsistent with response characteristics of the high dam.The reinforcement zone is suggested based on the calculation results of high dam.更多还原