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由于岩土介质的复杂多样性,通用分析软件所提供的岩土流变本构模型往往不能满足工程实际数值分析的需要。基于广义西原粘弹塑性流变模型有限元理论格式,根据ABAQUS的UMAT格式要求,编制相应的接口程序,将广义西原粘弹塑性流变模型引入ABAQUS中。通过单轴压缩蠕变数值试验验证了二次开发的广义西原粘弹塑性流变模型程序是正确的。最后对一过江盾构隧道进行粘弹塑蠕变计算,得到管片不同位置处位移随时间的变化规律。本文的二次开发的研究成果可以用来解决岩土工程数值计算问题,同时所提出研究思路具有普遍性,为采用ABAQUS平台进行其他本构模型的二次开发提供了借鉴和参考。
Due to the complexity of geotechnical media, the constitutive model of geotechnical rheology provided by general analysis software often can not meet the needs of practical numerical analysis. Based on the finite element theory of generalized Nishihara viscoelasto-plastic rheological model, the corresponding interface program is prepared according to the UMAT format of ABAQUS, and the generalized Nishihara viscoelastic plastic rheological model is introduced into ABAQUS. The uniaxial compressive creep numerical experiment verifies that the second developed generalized Nishihara viscoelasto-plastic rheological model program is correct. Finally, a viscoelastic plastic creep calculation of a tunnel crossing the Yangtze River was carried out, and the displacement of the pipe at different positions was obtained. The research results of the secondary development of this paper can be used to solve the problem of numerical calculation of geotechnical engineering. At the same time, the proposed research ideas are universal, which provides a reference for the secondary development of other constitutive models by ABAQUS platform.