基于有限单元法的岩土材料本构二次开发及其应用

摘要

Duncan-Chang E-v模型因其参数概念清晰、物理意义简单等优点而广泛应用于各种土工问题的有限元分析中.本文为进一步解决有限元软件ABAQUS所提供的材料本构模型难以描述岩土介质非线性变形特征等问题,在先前工作的基础上,基于UMAT用户子程序二次开发平台,编制了Fortran接口程序,开发了Duncan-Chang E-v非线性弹性模型模块,并将该模型应用到高填石路堤施工沉降分析中.数值结果显示:由于应力不能及时扩散的缘故,在路堤填高一半、靠近外边坡的地方,出现了最大水平位移；竖向位移的大小受水平位移的大小影响,且大致出现在堤高(1/3～1/2)的位置；大主应力σ1的最大值和小主应力σ3的最大值均出现在堤底的最深处.%For the reason of clear conception and simple physical meaning,Duncan-Chang E-v is applied widely in civil engineering field.With the user material subroutine UMAT provided by the FEM software ABAQUS and the Fortran language for programming for Duncan-Chang E-v nonlinearity constitutive model,we can easily express the nonlinearity of rock and soil.Meanwhile,the model is applied in sedimentation analysis of high embankment.The results indicate that there is the most horizontal displacement in about middle embankment height ; there is the most vertical displacement in about (1/3 ～ 1/2) embankment height;there are the most major stress and minor stress in deepest place.