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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。
Using the user subroutine interface of finite element analysis software ABAQUS, the Duncan-Chang constitutive model was developed in ABAQUS to analyze the stress and strain of earth-rock dam. When seepage is considered, the seepage field of the dam body is calculated firstly by the finite element method. The escape point and the infiltration line of the steady seepage are calculated by the iterative method. The permeability of the dam body is obtained according to the hydraulic gradient. Then, the seepage force determined by seepage analysis and the load of soil buoyancy are jointly applied to the dam during construction, and the stress and strain of the earth-rock dam during steady seepage are analyzed and calculated. The analysis results show that it is reasonable to use this method to analyze the stress and strain in the steady seepage period of earth-rock dam, and the computational efficiency is greatly improved.