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
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