Seepage Modeling with SEEP/W - GeoStudio 2007 version 7.22

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Chapter 2: Numerical Modeling SEEP/W Page 24
SEEP/W Chapter 3: Geometry and Meshing 3 Geometry and Meshing 3.1 Introduction Finite element numerical methods are based on the concept of subdividing a continuum into small pieces, describing the behavior or actions of the individual pieces and then reconnecting all the pieces to represent the behavior of the continuum as a whole. This process of subdividing the continuum into smaller pieces is known as discretization or meshing. The pieces are known as finite elements. In GeoStudio, the geometry of a model is defined in its entirety prior to consideration of the discretization or meshing. This is an approach that is new in GeoStudio 2007. Furthermore, automatic mesh generation algorithms have now advanced sufficiently to enable a well behaved, numerically robust default discretization often with no additional effort required by the user. Of course, it is still wise to view the default generated mesh but any required changes can easily be made by changing a single global element size parameter, by changing the number of mesh divisions along a geometry line object, or by setting a required mesh element edge size. Figure 3-1 shows the fully defined model for a soil excavation project. The entire model was built using various geometry items. • Soil regions were specified; • Geometry lines were drawn at the locations of tie-back anchors and cutoff wall; • Soil material models were created and assigned onto the geometry objects and • Pre-defined boundary conditions were drawn on the region edges. As a final step before solving, the mesh properties were viewed and adjustments made. In this case, the global element size was specified as 1.0 meter. In addition, the geometry line representing the grouted section of the anchors was discretized. The pre-stressed length of the anchors was intentionally left nondiscretized. The final model is shown in Figure 3-2. Now that you have a basic introduction to the concept of building your model using geometry objects, we can discuss each type of object in more detail. We must also have a discussion about the finite elements themselves, as these are the backbone to the entire finite element method. Page 25
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Chapter 6: Analysis Types SEEP/W ON
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Chapter 8: Numerical Issues SEEP/W
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Chapter 11: Modeling Tips and Trick
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Chapter 13: Theory SEEP/W k x k y Q
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Chapter 13: Theory SEEP/W Table 13-
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Chapter 13: Theory SEEP/W [ C] = wh
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Chapter 13: Theory SEEP/W { Q} = q
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Chapter 13: Theory SEEP/W Figure 13
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References SEEP/W Figure 14-1 Globa
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References SEEP/W In equation form,
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References SEEP/W Table 14-4 Interp
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References SEEP/W Burland J.B. 1996
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References SEEP/W Swanson, D. 1991.
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SEEP/W Index Adaptive time stepping
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SEEP/W Seepage faces ..............
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Seepage Modeling with SEEP/W - GeoStudio 2007 version 7.22

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