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| STUDY OF DEFORMATION AND FAILURE MODEL FOR DEEP ROCK MASS AND ITS NUMERICAL METHOD |
| LI Wenpei1，WANG Mingyang1，FAN Pengxian1，DENG Hongjian2 |
(1. Engineering Institute of Engineering Corps，PLA University of Science and Technology，Nanjing，Jiangsu 210007，China；
2. Institute of Structural Mechanics，China Academy of Engineering Physics，Mianyang，Sichuan 621900，China) |
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Abstract A discontinuous elastoplastic model for plane strain was presented to depict rock shear strain localization phenomenon；and the classical slip line field theory is used as a frame in the model. The discontinuities of displacement field on slip lines are described with an assemblage of continuous functions；and control equations in the model are deduced from physical law in local orthogonal curvilinear coordinates. The deformation process is divided into three phases：elastic，plastic and post-peak shear localization phases. The materials on slip lines obey the Coulomb criterion and break on slip lines appeared after peak strength，while initial cohesion decreases linearly and finally disappears. The model is dispersed with finite element method(FEM) and solved with the Newmark method，which is actualized with Fortran code. A simple case is given to validate the model by comparing with the analytical solutions of traditional continuous model. Both strain and stress tensors of materials are asymmetric in the model；and plastic behavior and energy dissipation of materials depend on deformation motion at discontinuous interface. The discontinuous model can profoundly describe the post-peak shear localization phenomenon of deep rock mass.
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Received: 14 February 2011
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2011, Vol. 30 
