基于ABAQUS的心墙土石坝拱效应研究

Research of Arch Effect in Core Wall Rock-Fill Dam Based on ABAQUS

土石坝心墙拱效应是影响大坝安全稳定运行的重要因素,为了研究心墙拱效应的影响因素,采用ABAQUS软件建立三维有限元模型,利用其二次开发平台,编写并调用邓肯-张E-B模型子程序,将心墙坡度和干密度作为敏感参数,对某心墙堆石坝竣工期与蓄水期进行有限元静力计算,通过试算拟合得到变化干密度和变化变形模量的"等效关系",分析了心墙坡度、干密度两个因素对心墙拱效应的影响。结果表明,增大心墙坡度和干密度可以有效减弱拱效应。

Arch effect of the core wall of rock-fill dam is an important factor, which affects the safe and stable operation of the dam. To study it , we used ABAQUS software secondary development platform, wrote and called the Duncan-Chang E-B model subroutine, and took the core wall slope and dry density as the sensitive parameters, then we used finite element method to calculate the static of the core wall of rock-fill dam during completion of construction period and storage period, through method of trial fitting changes, we got the equivalent relationship of dry density and deformation modulus, and then we analyzed the influence of the arch effect of the wall with two factors of core wall slope and dry density. The results show that, enlarging the core wall slope and the dry density can effectively weaken the arch effect.