双江口土石坝心墙拱效应分析

对双江口心墙堆石坝的三种设计断面进行三维有限元计算，研究了三种不同材料分区情况下心墙的应力拱效应，分析心墙和坝壳的弹性模量、泊松比对拱效应的影响；定义了一个能表征心墙应力拱效应强弱的参数-拱效应系数。并对不同坝体范围内统计的拱效应系数进行了定量比较。结果表明，三种设计断面的拱效应相近；大坝心墙的应力拱效应在两端坝肩、3/4坝高及心墙底部比较显著。

Analysis of core arching effect of Shuangjingkou Earth-rockfill Dam

The arching effect of core-wall of ShuangJiangkou earth-rockfill dam of three different design schemes is analyzed by using three-dimensional finite element method. The effects of Poisson’s ratio, Young’s modulus of core and shell on arching effect are studied. The arching effect coefficient that can reflect the core arching effect is defined; and it is used to investigate the arching effect coefficients of different zones of the dam. The results indicate that the core-wall arching effects of the three schemes are similar; and the arching effect is stronger at the abutments, three quarter of the dam and core wall bottom.