Force Polygon non-closure issue with PWP

SoheilaHabashi1
SoheilaHabashi1 Unconfirmed Posts: 1 New Member
in GeoStudio

Hi,

I am using GeoStudio Slope/W version 2023.1.1. There is a problem with force polygon resulting from analysis when piezometric surfaces are introduced to the model (Before addition of piezometric surfaces the polygons are healthy). The polygons appear no to be closing for submerged slices. There is no problem with them when the PWP is not considered. But, the problem arises with considering pore water pressure and introducing piezometric surfaces. It is worth mentioning that the MP and spencer method were tested and the problem exists for both. any ideas on this problem? Is that a software issue?

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Answers

  • TrevorKent
    TrevorKent Employee Posts: 46 Corundum Rank Badge

    Hi @SoheilaHabashi1,

    I saw your question was answered in support. For anyone else who finds this thread and is having the same issue, here is the answer:

    GeoStudio calculations are based on the unit system (Imperial or SI) used when the file was originally created. Changing the units in View | Units only affects the display of values, not the units used for internal computations.

    If a model created in one unit system is viewed with display units from another system without proper conversion awareness, numerical values (including those in force polygons or slice information) can appear scaled incorrectly. This can lead to displayed forces that seem disproportionate. It is recommended to create models using the appropriate unit template from the beginning to avoid such discrepancies. In your case, you would have to start a new file with the correct units.

    I checked other models with similar pwp conditions (i.e. surcharge from ponded water) and the force polygons were all closed - they were set up with the correct units.

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