沥青混凝土心墙坝三维有限元静动力分析

摘要

针对沥青混凝土心墙均质坝，运用非线性三维有限元法进行静动力分析.对大坝填筑与蓄水阶段分别进行模拟，并计算了沥青混凝土心墙坝动力响应，分析了坝高、动剪切模量、地震峰值加速度及地震波对心墙最大动剪应变的影响，总结了心墙应力与变形、动剪应变分布规律.结果表明：静力状态下，尤其是满蓄期，应重点关注心墙坝肩处、顶部和底部区域，且高心墙处于更不利的应力与变形状态.地震作用下，动剪应变最大值发生在河谷中央心墙顶部区域，但动剪应变幅值较小，一般不超过0.5%.%In order to study the static and dynamic characteristics of homogeneous rockfill dams with asphalt concrete core,the nonlinear three-dimensional finite element method was employed.Filling and storing processes of the dam were simulated,and the dynamic response of the dam was also got considering the influences of height of the dam,dynamic shear modulus,peak acceleration and seismic waves on the maximum dynamic shear strain of the core.The distribution of the stress,deformation and dynamic shear strain of the core were summed up.The results show that the top,bottom and abutment regions of the core should be paid more attention to and high core will be under more unfavorable conditions in static state, especially in full storage period. Under the action of earthquake,the dynamic shear strain at the top of core of central valley is the largest,but the value is small,less than 0.5%.