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| The coupled chemo-thermo-hydro-mechanical constitutive modeling for the mixed finite element of unsaturated porous media |
| Revised:April 05, 2005 |
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| DOI：10.7511/jslx20074079 |
| KeyWord:unsaturated porous medium,mixed finite element,coupled chemo-thermo-hydro-mechanical analysis,constitutive modelling |
| LIU Ze-jia LI Xi-kui |
| 1. The State Key Laboratory for Structural Analysis of Industrial Equipment, Dalian University of Technology, Dalian 116024, China; 2. School of Traffic and Communications,South China University of Technology, Guangzhou 510641, China |
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| Abstract: |
| An algorithm for the chemo-thermo-hydro-mechanical(CTHM) constitutive modelling,aiming to the chemo-thermo-hydro-mechanical constitutive model of porous media proposed in reference[1],is developed for the mixed finite element method in the coupled thermo-hydro-mechanical analysis of unsaturated media present in reference[2].A multi-surface yield criterion using non-associated flow rule is adopted to simulate the material non-linearity of unsaturated porous media.A return mapping algorithm for the integration of the rate constitutive equation and the consistent elasto-plastic tangent modulus matrix as well as the consistent elasto-plastic tangent stiffness matrix of the mixed element with the u-pw-pa-T form are derived.The consistent algorithms for the two component yield surfaces,i.e.the Critical State Line(CSL) and the State Boundary Surface(SBS) criteria,are particularly given in this paper.The numerical results demonstrate the capability and the validity of the present algorithm of mixed finite element constitutive modelling in simulating the coupled chemo-thermo-hydro-mechanical behaviour in porous media caused by the thermo-chemo-mechanical loading. |
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