Hi, I have to draw 2 slope stability model, where FS have to be 1, one models cohesion and friction angle have to back calculate from a failure, for the other model how can I get again FS 1 with different cohesion and friction angle? the geometry will be same. I have to compare two model.
So I don't understand that how for two same model FS will be 1 but friction angle will be different?
Thanks
Dear Nadia,
You mention different cohesion and friction angle. Theoretically it is possible that 2 geometries that are exactly the same have the same FoS but with different cohesion and friction angle. However, they will most likely not have the same failure mechanism.
With kind regards,
Dennis Waterman
Thank you for your answer. Actually maybe I can not ask properly the question. I have to draw 3 same geometry models (A slope failure) where FOS have to consider 1, but the properties have to change like the cohesion , angle of friction etc. that's why I am confused how can I do that.
As far as I understand first model have to draw by back calculating a slope failure and consider FOS 1 and find the corresponding friction angle.
After that in second model I have to change the friction angle from my lab test report got from the failure site material. In that case how can I consider FOS 1. that's my question.
And in the 3rd model I have to consider seepage analysis.
If you can ONLY change the friction angle then it is not possible. Exactly the same geometry with exactly the same soil parameters but only a different friction angle will have a different FoS. So if that is what they really ask from you you can give the assignment back: it's phyiscally impossible. But if you're allowed to change BOTH the friction angle and the cohesion then you can do it.
Thank youvery much