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Stress Grid
A Stress Grid defines a grid of points at which the stresses and displacements are computed during the boundary element analysis. The final data contours (stress, displacement, strength factor, strain) are interpolated from the results computed at the grid points.
Stress grid showing grid points and resulting contours
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Stress Grid: Automatic
By default, a stress grid is automatically created after you define an excavation boundary, so that the stress analysis contours can be viewed immediately. The size of the automatic stress grid is based on the size of the excavation. The settings which control the relative size and grid spacing of the automatic grid can be customized in the Preferences dialog.
Auto stress grid settings
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Stress Grid: Add
You can also manually add a stress grid, by clicking and dragging with the mouse. This allows you to easily define a grid of any size, location or grid spacing. Multiple stress grids can be defined, for example, if you wish to define a finer grid within a coarser grid, to obtain more accurate contours near boundaries.
Custom stress grid defined for ground surface model
Note: the display of the grid points can be turned on or off in the Display Options dialog.
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Stress Grid: Edit
Grids can easily be edited. You can interactively change the size or location of a grid by clicking and dragging with the mouse. Or you can quickly modify the grid spacing by clicking on the grid boundary and changing the grid point density in the Grid Spacing dialog.
Right click menu options for editing stress grid
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Stress Grid: Number of Grid Points
The default number of grid points is usually suitable for an initial analysis. You will obtain smoother contours and more accurate results as you increase the number of grid points within a grid. However, the apparent compute speed is proportional to the number of grid points. If you use a very large number of grid points, this can noticeably slow down the speed of computation, and the updating of the contours. In general, you should not use more grid points than necessary to achieve the desired accuracy of results.
Grid spacing dialog
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