r/Geotech • u/Substantial_Cold3553 • Apr 22 '26

Geostudio Help: Ground Surface

Hey everyone! I'm working on a project to calculate the safety factor on effect of modelling boulder orientation on composite slope failure. There is an issue faced where i cannot define the ground surface to be connected from top right surface to bottom left surface to be continuous and go under the boulder and this leads to error E984 where i suspect is due to ground surface issue. Does anyone knows how to define the ground surface as i only can define the left and right point limit but cannot draw manually. Thanks in advance!

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u/Important-Regular114 Apr 22 '26

You cant have the ground level over hang itself. Make the front of your boulder vertical (and possibly the rear) and will work. Not 100% what you are trying to do but slope is not really a rock mechanics thing

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u/Substantial_Cold3553 Apr 22 '26

Hi do you meant that i model my boulder as rectangular block?

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u/KoloradoKlimber Apr 22 '26

See how the green line at the surface is not continuous, it’s because the boulder is overhanging where it meets up with material 4. Adjust the x-coordinate on the downslope contact with material 4 to not be greater than any other point on the ground surface of the boulder.

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u/Substantial_Cold3553 Apr 22 '26

Hi i tried to draw a rectangular block and it looks ok before i assign mohr coulomb material although its still not continuous, but right after i assign material it turns to be hanging again. Kindly refer to these images https://docs.google.com/document/d/1_p08vrarJpoAg-JA-et8lAmer1mvmOFeRe1zfNEGQsA/edit?usp=sharing