When I use Limit equilibrium method to analyse the slope stability, such as the Slide or Slope/W, I find the safety factor is not unique even if the the same method is adpoted, such as Bishop or others. The key question is the the selection of "slip surface grid" and "slip surface radus". The different location will lead to different result but no any errors occur.
I am wondering which location is correct? whether these results are all correct?
I wish get help especially those users who use Slope/W or Slide software.
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