东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2016, Vol. 37 ›› Issue (7): 1022-1027.DOI: 10.12068/j.issn.1005-3026.2016.07.024

• 资源与土木工程 • 上一篇    下一篇

横观各向同性岩土结构极限承载力的数值研究

常江芳， 楚锡华， 徐远杰   

  1. (武汉大学 土木建筑工程学院， 湖北 武汉430072)
  • 收稿日期:2015-03-16 修回日期:2015-03-16 出版日期:2016-07-15 发布日期:2016-07-13
  • 通讯作者: 常江芳
  • 作者简介:常江芳(1988-)，女，河北石家庄人，武汉大学博士研究生； 徐远杰(1956-)，男，湖北武汉人，武汉大学教授.
  • 基金资助:
    国家自然科学基金资助项目(11172216，11472196).

Numerical Investigation of Ultimate Bearing Capacity for Transversely Isotropic Geostructures

CHANG Jiang-fang， CHU Xi-hua， XU Yuan-jie   

  1. School of Civil and Architectural Engineering， Wuhan University， Wuhan 430072， China.
  • Received:2015-03-16 Revised:2015-03-16 Online:2016-07-15 Published:2016-07-13
  • Contact: CHANG Jiang-fang
  • About author:-
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摘要： 基于Cosserat连续体，建立了描述横观各向同性岩土材料的弹塑性模型，在该模型中，弹性本构关系由5个变形参数描述，塑性阶段通过引入组构张量及加载方向建立了修正的Drucker-Prager准则.针对上述模型推导了一致性映射返回算法的迭代格式及模量矩阵，结合适用于Cosserat连续体的平面应变8节点减缩单元应用ABAQUS用户自定义单元接口UEL进行了数值实现.数值算例分析了各向异性程度和材料主方向对横观各向同性岩土结构的极限承载力和变形局部化模式的影响.结果表明，所建立模型能较好地模拟横观各向同性岩土结构的应变局部化行为，且较好地解决了伴随应变局部化现象出现的网格依赖性问题.

关键词: 岩土结构, 横观各向同性, Cosserat连续体, 应变局部化, 极限承载力, 数值模拟

Abstract: An elastic-plastic model for transversely isotropic geostructures is developed based on the Cosserat continuum. In the model， the elastic constitutive relationship is described by 5 deformation parameters and the Drucker-Prager yield criterion is extended by introducing fabric tensor and loading direction in the plastic stage. The iterative format for return mapping algorithms and the tangent modulus matrix are formulated for the proposed model. The numerical simulation is implemented based on the user subroutine (UEL) of ABAQUS， and a plane strain 8-noded reduced integrated element is used. The influence of the material principal direction and the anisotropic degree on the strain localization and the bearing capacity of the structure are analyzed. Numerical results show the validity and performance of the proposed model in simulating the strain localization behavior of transversely isotropic geostructures. Furthermore， the mesh dependency accompanied with strain localization is effectively solved.

Key words: geostructures, transversely isotropy, Cosserat continuum, strain localization, ultimate bearing capacity, numerical simulation

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