基于有限元数值计算的重力坝稳定及应力变形分析

Stability and Stress Deformation Analysis of Gravity Dam Based on Finite Element Numerical Calculation

为研究重力坝的稳定性以及其应力分布规律,本文采用有限元数值计算方法 ,在三种不同工况下,建立两种不同断面的(溢流段与非溢流段)三维实体模型计算,并对其结果进行分析总结。结果表明:坝体在三种工况作用下会出现一定的变形,其中水平位移随着工况的变化出现较大的差异,而竖向位移基本不变;水平和竖向位移出现最大的位置分别为坝顶和坝体坝踵处;应力分布规律基本相同,最大拉应力和最大压应力分别出现在坝踵处和廊道附近;在三种工况下,工况3的坝体模型安全系数最小,而相同工况下溢流段的坝体安全系数比非溢流段的坝体安全系数更小。

In order to study the stability of gravity dam and its stress distribution,this paper uses finite element numerical calculation method to establish three-dimensional solid model calculation of two different sections （overflow section and non-overflow section） under three different working conditions.And the results are ana-lyzed and summarized.The results show that the dam body will have certain deformation under the three work-ing conditions,and the horizontal displacement will have a large difference with the change of working conditions,while the vertical displacement is basically unchanged;The maximum positions of horizontal and vertical displacement are dam crest and dam dam;the stress distribution law is basically the same,the maximum large principal stress and the largest small principal stress appear near the dam and the corridor respectively;Under the circumstance,the safety factor of the dam model of working condition 3 is the smallest,and the safety factor of the dam body of the overflow section under the same working condition is smaller than that of the nonoverflow section.