You need to be checking that is able to cope with all possible installation problems!, that is working under the expected mode of failure with a variation of loading effects and soil parameters(undertake sensitivity).
Always design the pile for 2-3diameters below the fixity point(zero...
Georam,
Simple question, not straight forward answer. There is plenty of software out there. It seems though that SlopeW V.5 is the winning racing car of these days in slope stability analysis. It is the F3 ultimate tool in SS! I leave out F1 since it is nowdays filled in with FE programs (3D...