Why the factor of safety increase due to the boundary effect?

ShishirKumarSikderAm
ShishirKumarSikderAm Posts: 4
in GeoStudio

I am concerned about the way the program is computing the results. In my first analysis, the left boundary was located 100 m from the toe of the slope, and the calculated factor of safety was 1.30. In the second analysis, where the left boundary was placed only 50 m from the toe, the factor of safety increased significantly to 1.93. This considerable change occurred despite all other conditions remaining the same, which raises questions about the influence of boundary placement on the computed results.

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Answers

  • TrevorKent
    TrevorKent Posts: 36 Diamond Rank Badge

    Hi @ShishirKumarSikderAm, I can see in your screenshots that your entry and exit ranges are different in the two cases, which means that all the conditions are not the same. I would recommend keeping the entry and exit ranges the same in both cases, and checking to make sure all of the other variables are the same such as slope angle and material properties. If you are using the results from a SEEP/W analysis for your pore water pressure conditions, check the results of those for each geometry to to see if they're different.

    If you're still getting this large of a discrepancy after checking everything, please submit a ticket here so we can take a look: https://www.geoslope.support/new/

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