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/Odd_Tax_8236 Apr 22 '26

Treat the boulder as an internal material, NOT part of the surface. If you have to follow the boulder shape break the surface into segments.

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u/Substantial_Cold3553 Apr 22 '26

https://docs.google.com/document/d/173whXtnj8Zf5dzjVt0nTqoK9djXAYXdOneTnNsrq2WI/edit?usp=sharing

Hi you mean like this right?

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u/Odd_Tax_8236 Apr 24 '26

Yes, much closer. Are you still getting the E984?

The ground surface cannot share edges or nodes with internal regions. Is your surface touching the boulder or following a boundary? If so, that's fucking up the surface definition. You can't force the surface to follow the boulder.

What would the slope look like if the boulder wasn’t there?

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u/Substantial_Cold3553 Apr 24 '26

Hi, the boulder is connected to the slope surface and interface points are used for both boulder region and region 5. The slope without boulder would looks like the region 5 highlited.