基于ABAQUS的土石坝稳定渗流期应力应变分析

利用有限元分析软件ABAQUS的用户子程序接口,实现了Duncan-Chang本构模型在ABAQUS中开发,对土石坝应力应变进行分析。考虑渗流作用时,首先采用有限元法计算坝体渗流场,通过迭代法算出稳定渗流的逸出点和浸润线位置,并根据水力梯度得到坝体所受的渗透力。然后将渗流分析所确定的渗流力与土体浮力等荷载共同施加在施工期的坝体上,分析计算土石坝在稳定渗流期的应力应变值。分析结果表明:采用此方法进行土石坝稳定渗流期的应力应变分析是合理的,且大大提高了计算效率。

Stress and strain analysis for earth rock-fill dam during stable seepage period based on ABAQUS

The stress and strain analysis for earth rock-fill Dam has been caryed out by the Duncan-Chang constitutive model using the subroutine in the finite element analysis software ABAQUS.When considering the effect of seepage,the position of the exit point and the phreatic surface,as well as the total head are calculated through iteration at first,the seepage forces are then determined according to the hydraulic gradient.In the consequent stability analysis,seepage forces,and buoyancy are loaded on the construction period dam.The stress and strain in stable seepage period for earth rock-fill dam were analyzed.The analysis results demonstrated that this method is reasonable and efficient for dam stress-strain during stable seepage period.