Journal of South China University of Technology(Natural Science Edition) ›› 2016, Vol. 44 ›› Issue (10): 70-80.doi: 10.3969/j.issn.1000-565X.2016.10.011

• Mechanics • Previous Articles     Next Articles

Finite Element Simulation of Strain Localization in Transversely Isotropic Geomaterials

CHANG Jiang-fang1,2 XU Yuan-jie1 CHU Xi-hua1   

  1. 1.Engineering Mechanics Department，Wuhan University,Wuhan 430072,Hubei,China; 2.Mechanics Engineering Department,Shijiazhuang Tiedao University,Shijiazhuang 050043,Hebei,China
  • Received:2015-01-19 Revised:2016-01-14 Online:2016-10-25 Published:2016-09-01
  • Contact: 徐远杰(1956-)，男，博士，教授，主要从事工程结构破坏数值仿真研究． E-mail:xyj9781@163.com
  • About author:常江芳(1988-)，女，博士，讲师，主要从事岩土材料强度与破坏的数值研究． E-mail:cjf881024@163． com
  • Supported by:
    Supported by the National Natural Science Foundation of China(11172216)，the National Program on Key Basic Ｒesearch Project of China(2010CB731502)and the Natural Science Foundation of Hubei Province(2013CFB287)

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Abstract:

The anisotropic properties of geomaterials are significantly related to their inherent microstructures.In this paper,a modified Drucker-Prager yield criterion for transversely isotropic materials is developed by evaluating the internal friction angle with the stress state,the microstructure tensor and the material principal direction.Then,based on the Cosserat continuum theory,a consistent return mapping algorithm for the modified criterion is formulated,and a consistent tangent modulus matrix is achieved.Moreover,the codes are implemented through the user defined element subroutine (UEL) in the finite element software Abaqus,and the correctness of the pro- gram is verified by comparing the theoretical results with the relationships of the material strength to the principal direction and anisotropic degree of the material in the integration points.Finally,the influences of the principal direction and anisotropic degree of the material on the bearing capacity and the failure mode of the structure are em- phatically analyzed by numerical examples,which are then compared with the results based on the classical contin- uum theory.It is found that the above-mentioned method is effective in simulating the strain localization of trans- versely isotropic geomaterials.

Key words: geomaterials, geomechanics, transverse isotropy, Cosserat continuum, yield criterion, strain locali- zation