Seepage Modeling with SEEP/W - GeoStudio 2007 version 7.22

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Chapter 3: Geometry and Meshing SEEP/W 50 37 38 23 24 25 Figure 3-8 Truss loading model In Figure 3-8 structural bar properties have been applied to a pattern of free lines in order to determine displacements under loading for the truss system. 4 18 5 17 Figure 3-9 Anchors on lines (line is partially meshed) Figure 3-9 shows two key aspects of free lines. A free line in two segments has been drawn to model a tie back anchor. The upper length of the free line was left un-discretized (i.e., independent of the finite element mesh) while the lower length is incorporated into the mesh. The lower end represents a beam structural member which requires that it is aligned with the surrounding soil elements. The upper length represents a structural bar element which only acts in tension or compression and only has an active force and stiffness at its end points which do coincide with nodal locations. It does not interact with the soil so does not need to share a mesh with the soil except at its end points. Page 30
SEEP/W Chapter 3: Geometry and Meshing Figure 3-10 Lines with material model “none” (no flow) assigned to simulate lysimeter collection basin in waste beneath an engineered soil cover Figure 3-10 shows the use of free lines to construct a lysimeter collection basin beneath an engineered soil cover system. The line was assigned a material model of “none” to simulate a no flow condition (i.e., a null material). This is a key point to understand, that the line was assigned a material model. When this is done, the line inherits the behavioral properties of the material assigned and a special interface element is added to the line mesh. The interface behavior depends on the application being solved. In this example, the interface has “no flow” across it. In a stress-deformation model, the interface on the line may be assigned soil – structure friction/slippage properties. Interface elements are discussed in more detail in the next section. Interface elements on lines In the previous section the concept of applying a material model to a single line was introduced. The actual material models that can be used are dependent on the analysis being solved. For example, in SEEP/W an interface model may be used to represent a geo-fabric or a null material to represent a barrier to flow. In TEMP/W it may be a thin insulation layer. In SIGMA/W, the material model may describe the friction properties between soils, or a soil and a structure such as a cutoff wall. You can read about all of these models in the respective engineering books. Interface material on lines Figure 3-11 Illustration of "interface elements" on geometry lines Page 31
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Chapter 13: Theory SEEP/W { Q} = q
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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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