基于粘弹性边界在重力坝动力分析中的应用

Application of Viscoelastic Boundary in Dynamic Analysis of Gravity Dam

在重力坝动力分析中,选择合适的人工边界条件可以比较精准地模拟波在模型地基边界位置的传播特点,提高数值分析结果的精度。以西藏藏木重力坝为案例,采用有限元方法,对不同条件下重力坝的动力响应规律进行对比分析。分别从不同边界条件及不同输入地震动两个方面分析比较,结果表明:同传统的固定边界相比,粘弹性边界条件能够准确地模拟重力坝在地震动力作用下的响应。

In the dynamic analysis of gravity dams,selecting appropriate artificial boundary conditions can accurately simulate the propagation characteristics of waves at the boundary position of the model foundation,and improve the accuracy of numerical analysis results.Taking Zangmu gravity dam in Xizang as an example,the dynamic response law of gravity dam under different conditions is compared and analyzed by using the finite element method.This paper analyzes and compares two aspects:different boundary conditions and different input seismic motions.The results show that the viscoelastic boundary conditions can accurately simulate the response of gravity dams under seismic dynamic action compared with the traditional fixed boundary conditions.