The following additional two papers should also can help to perform stability analysis by spreadsheets:
Low, B. K. (1996). ¡°Practical probabilistic approach using spreadsheet¡±. Proceedings of Uncertainty in Geologic Environment: from Theory to Practice, ASCE Geotechnical Special Publication...
yes, I also use Plaxis to study the stability of slopes. And I also did quite a few compariosn of Fs values from Plaxis with those from conventional limite equilibrium methods. Thay are very close to each other....
