Ushnish Basu
Ansys Employee

The INITIAL_STRESS_DEPTH sets the initial stress due to gravity, LOAD_BODY maintains that stress throughout the simulation

A zero initial effective stress is inconsistent with hydrostatic pore pressures

The pore pressures are available as a history variables in d3plot and elout - see the section on "Output" in the Remarks under CONTROL_PORE_FLUID

Unfortunately, I am not able to provide more detailed help in this forum, hopefully other community members can help