Hi,
I am running safety analysis on Plaxis, in some cases in the beginning of the calculation the safety factor is going below 1 for a couple of points than it is increasing to values above 1 until it settles to a final factor of safety. In this case, the safety factor is the plateau value or i should consider the values below 1
thank you
Hadi
Hi Hadi,
I would not consider these true failure points if the settled factor of safety is higher than 1.0.
Of course, each problem is bespoke, therefore it would be prudent to ensure the steps are stored, so you can interrogate the failures in these early stages of the strength reduction phase and determine if they are a genuine problem.
Scot
Ok Thank you Scot
Dear Hadi,
As Scot mentioned, as long as the factor of safety is higher than 1, this can be assumed the true failure mode and Factor of Safety.Make sure to determine the factor of safety as a stable value of ΣMsf, and assess the failure mechanism for a sensible result.
If the value of ΣMsf drops below one [1] in the first few steps in the Safety Analysis, most likely it is caused by some out of balance from the previous phase. Using a Plastic nill step to solve this local out of balance can also prevent this drop of ΣMsf < 1 You can indeed also investigate the mechanism in the first steps and use your judgement there.
More details here in our latest SIG online class: https://event.on24.com/wcc/r/2165515/6BA8A61A920F589C3E5C23DA3B23FDD6?partnerref=SocialMedia Kind regards,
Micha van der Sloot
Ok Thank you Micha, I will check it