The Analysis And Application Of Saturated-unsaturated Seepage Finite Element About Embankment Dams

This article summarizes research on people on the basis of the results, aimed at reservoirs, such as tailings dam embankment dam project in the project security, combined with seepage problem currently on unsaturated soil research results, on the embankment dam of saturated-unsaturated theory and algorithms do a more detailed studies. The main contents include:(1) from unsaturated basic theory, to pressure head and saturation as the basic deduction the unknowns three-dimensional saturated porous media-unsaturated differential equations, and established a saturated-unsaturated mathematical model. On-unsaturated zone may occur through Yi stepping in to issue more closely approach, and on the free surface seepage presents simple and practical to saturation as the foundation of the free surface of capture method;(2) This article uses the c # language developed to-unsaturated soil DAM seepage program, on the basis of that analysis of the State in Shenyang ash dams and studies on ash dam variations;(3) this article in saturated-unsaturated numerical calculations, not only took into account the non-saturated zone of water movement, and saturated and unsaturated unification, form the total of the region. In the saturated-unsaturated flow analysis, the entire flow field takes a control equation, in saturated and unsaturated zone of control equation respectively supposition about pressure head of Laplace equation, and the saturation of convection equation. Among them, Laplace equation using preconditioned Conjugate gradient method (PCG) solution; convection equation solver using Gauss-Seidel.Key findings of this article is, based on a theory-unsaturated flow, using C # code index calculation program, DAM seepage and use ANSYS mesh functionality developed before processing interface program and postprocessing program, including analysis of major TECPLOT software, this program also provides Export DXF file format. Through two actual engineering calculation example analysis results show that the program is practical, reliable, and easy to operate, there are more convenient and post-processing interface.