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| NUMERICAL SIMULATION AND ENGINEERING APPLICATION OF SOLID-FLUID COUPLED MODEL FOR SATURATED POROUS MEDIA |
| CHEN Wu1，PEI Wansheng1，LI Shuangyang1，ZHANG Mingyi1，JIN Xia2 |
| (1. Cold and Arid Regions Environmental and Engineering Research Institute，Chinese Academy of Sciences，Lanzhou，Gansu 730000，China；2. School of Civil Engineering，Lanzhou Jiaotong University，Lanzhou，Gansu 730070，China) |
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Abstract Based on the theory of computational fluid mechanics and geotechnical mechanics，equilibrium equation of media and continuity equation of interstitial fluid are derived with the consideration of interaction of seepage and stress field. Numerical methods of solving the proposed equations as well as boundary conditions are put forward. Combined with Galerkin way，finite element method is employed to disperse equilibrium equation，while finite method is applied to the discretization of continuity equation. That is the backward differentiation formula and two order accuracy warming-beam formula. Then，a water-rich bi-directional tunnel is taken as an example，distribution of pore pressure，displacement，stress and mechanical behavior of anchorage in different construction stages are analyzed. Finally，numerical results are compared with the conclusion of related field monitoring. The study results could provide guidance for the design and construction of similar tunnel projects.
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Received: 19 July 2012
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2013, Vol. 32 
