高沥青混凝土心墙坝不同坝体结构的动力学特性分析

Dynamic Properties Analysis of Different Dam Structures of High Asphalt Concrete Core Dam

沥青混凝土心墙坝因其能够适应复杂的地质环境而被广泛应用在恶劣的环境中。在地震频发、强度大的区域,如果沥青混凝土心墙坝在地震的作用下发生破坏,将造成严重的损失与灾难。因此,对混凝土心墙坝的动力学特性进行研究具有重要工程意义。以新疆某高沥青混凝土心墙坝为研究对象。采用有限元计算软件ABQUES对不同高度的沥青混凝土心墙进行地震作用下的动力学特性进行分析,结果表明:沥青混凝土心墙坝在地震作用下,位移以及速度最大的点出现在坝顶的中心位置;随着坝体增高,心墙承受的压力越大;地震过程中,顺河向、坝轴向、竖向3个方向加速度和位移均随坝体的高度增加而增大,顺河向影响最大,坝轴向适中,竖向最小。

Asphalt concrete core dam is widely used in harsh environment because it can adapt to complex geological environment.In areas with frequent and strong earthquakes,if the asphalt concrete core dam is damaged under the action of earthquakes,it will cause serious losses and disasters.Therefore,it is of great engineering significance to study the dynamic characteristics of concrete core dam.This paper takes a high asphalt concrete core dam in Xinjiang as the research object.Dynamic characteristics of asphalt concrete core walls with different heights under earthquake are analyzed by finite element calculation software ABQUES.The results show that under the earthquake action,the maximum displacement and velocity of asphalt concrete core dam occur at the center of dam crest.The higher the dam body,the greater the pressure on the core wall.During the earthquake,acceleration and displacement along the river,dam axis and vertical direction all increase with the height of the dam body,the impact along the river is the biggest,the dam axis is moderate and the vertical direction is the smallest.