We have a client with a modeling requirement to evaluate buried piping assuming the soil settles 1" and seeing how the soil overburden affects the piping, and I'm not sure how this can be done using AutoPIPE. (Note this is not the same as forcing a discplacement of the pipe by 1")
This apparently can be done in Caesar, by forcing a displacement of the soil springs below the pipe by the 1", but I am not having luck finding a similar method in AutoPIPE and would really like to stick with using AutoPIPE if possible.
Have you looked into using the Building Settlement option? This does require imposed displacements to be applied but then creates a Building Settlement stress category based on ADAMS ET. AL. Equation 10.