三种弹塑性本构模型预测路基变形的对比研究  

EVALUATION OF THREE ELASTO-PLASTIC CONSTITUTIVE MODELS BY NUMERICAL MODELING OF SOIL EMBANKMENTS

作　　者：刘兴华[1,2] 张飚[1,2] 杨松[1,2] 高彦斌[3] 

机构地区：[1]中冶建筑研究总院有限公司,北京100088 [2]中国京冶工程技术有限公司,北京100088 [3]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《工业建筑》2013年第7期76-79,85,共5页Industrial Construction

基　　金：国家自然科学基金项目(40702051;50678130)

摘　　要：采用三种弹塑性模型——剑桥模型(MCC)、三维修正剑桥模型(3DMCC)和考虑各向异性的三维修正剑桥模型(ANIS-MCC),对一假想路堤进行快速加载下的固结变形有限元分析,以考察这三种模型预测结果的区别,为路基变形有限元分析时的本构模型的选取提供依据。研究结果表明,在路基未达到破坏状态以前,三种模型给出的路基变形、孔压消散的规律性基本一致;但当研究分析需要特别提高坡脚位置处地基变形预测精度时,最好采用较为复杂的能够反映土体各向异性屈服特性的模型,如ANIS-MCC模型。Through the finite element analysis of an imaginary embankment under fast loading, in order to examine the difference of consolidation deformation results predicted by the three plastic-models （MCC, 3DMCC, and ANIS-MCC）. The research results showed that the variation trendeney of the deformation and pore pressure were mainly the same before the destroy of the embankment, however, when it neeessicary, especially to improve the prediction accuracy of the ground deformation at foot, it was best to use the more complex model that could reflact the anisotropic yield characteristics of the soil, such as ANIS-MCC.

关 键 词：弹塑性 各向异性 路基 固结 有限元 

分 类 号：U416.1[交通运输工程—道路与铁道工程] U213.1