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| COUPLED FLUID FLOW AND STRESS COMPUTATION MODEL OF DUAL MEDIA BASED ON CONTINUUM-MEDIUM DISTINCT ELEMENT METHOD |
| LIU Yang，LI Shihai，LIU Xiaoyu |
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Abstract To simulate the progressive failure process of the slope in water level fluctuation and rainfall conditions，a coupled fluid flow and stress computation model of dual media is established based on continuum-medium distinct element method. It contains solid calculation model，pore hydromechanical coupling model and fissure hydromechanical coupling model. Solid calculation model could reflect failure regularity of the geologic body，also could simulate the process from continuum to discontinuum. Pore hydromechanical coupling model could calculate the location of phreatic surface conveniently. Fissure hydromechanical coupling model could avoid convergence problem caused by isolated fissure. Considering the final states of the water level fluctuation and rainfall，the waterhead distribution caused by fissure seepage and water level fluctuation in reservoir are regarded as the variable boundary condition，thus implementing the coupling analysis for pore and fissure seepage flow field. Typical example computational results show that a coupled fluid flow and stress computation model of dual media based on continuum-medium distinct element method is very effective for the analysis of reservoir ancient landslide.
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Received: 09 July 2010
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2011, Vol. 30 
