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| STUDY OF ELASTOPLASTIC DAMAGE-HEALING MODEL FOR ARGILLITE |
| QU Jiawang1，2，LIU Quansheng1，2，HE Jun1，2，LIU Zhiping1，2 |
| (1. School of Civil Engineering and Architecture，Wuhan University，Wuhan，Hubei 430072，China；2. Hubei Province Key Laboratory of Geotechnical and Structural Engineering Safety，Wuhan University，Wuhan，Hubei 430072，China) |
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Abstract Under the action of high stress and water chemistry in underground space，cracks of the damaged argillite would healed by themselves thus their physico-mechanical performance will recover. This character of argillite greatly influences stability of surrounding rocks as well as radionuclide migration and isolation in high level radioactive waste disposal repository buried in argillite. According to generalized thermodynamic and continuum damage mechanics，based on maximum dissipation principle，an internal variable describing the healing property of argillite is introduced，and an elastoplastic damage-healing model for argillite is developed which is able to depict deformation，damage and healing evolution characters of argillite. Then the proposed model and a model formed by removing healing part are used to simulate triaxial compression experiments of argillite under different confining pressures，respectively. Simulation values of the two models are compared with experimental data. Results indicate that the developed model can reasonably and effectively describe main mechanical characters of argillite which has healing effect，and the healing part of model significantly influences performance of model.
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Received: 18 December 2012
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2014, Vol. 33 
