Development of nonlinear elasto-plastic constitutive model for rock based on Hoek-Brown yield criterion and its numerical implementation

被引：0
|
作者：
Shu C. [1 ,2 ]
Shi F. [1 ,2 ]
Hu G. [3 ]
Wang H. [1 ,2 ]
机构：
[1] State Key Laboratory of Coal Mine Disaster Dynamic and Control, Chongqing University, Chongqing
[2] National and Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing
[3] School of Mines, China University of Mining and Technology, Xuzhou, 221116, Jiangsu
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2016年 / 35卷
基金：
中国国家自然科学基金;
关键词：
Hoek-Brown(H-B) yield criterion; Nonlinearity elasto-plasticity; Numerical implementation; Rock constitutive relations; Rock mechanics;
D O I：
10.13722/j.cnki.jrme.2014.1525
中图分类号：
学科分类号：
摘要：
In order to deal with the singularity of Hoek-Brown(H-B) yield criterion, a nonlinear elasto-plastic model based on the Hoek-Brown yield criterion was developed, where the stress was updated in the principal stress space and was mapped into general stress space, and the nonlinearity of elastic deformation was also taken into account. This method can serve as an accurate implementation of the Hoek-Brownyield criterion model. For the validation of the model, the user defined material(UMAT) code was redeveloped in Ls-dyna with Fortran programming language. With the building of 3D geometry of uniaxial compressive test model and Brazilian test model, the exact solution of the model based on H-B yield criterion including failure mode was implemented by deleting of elements whose effective plastic strain is up to a given value. Finally, the numerical results were compared with the experimental test and showed good agreement, which indicates a high accuracy of the presented model. © 2016, Science Press. All right reserved.
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页码：2627 / 2634
页数：7
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