Effective Stress when zonebase pore pressure is on

FLAC3D
1

Hi,
I am struggling with the interpretation of effective stresses. So far I used version 9.00 of FLAC3D. concept is: deplete a disk shaped reservoir at around 1800m depth.
I start applying the total stresses loading with gravity based on density and an initial total stress ratio.Then I use the example Input Instructions for Fluid-Flow Analysis — Itasca Software 9.0 documentation as a guide for applying delta pressures based on zone.pp. (apply 0 pressure two times when there is no depletion and applying a negative delta pressure at the reservoir zone)

I notice now that the total and effective stresses plotted along a vertical profile through the reservoir look different based on the version I use to open the *.sav file:

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Has there been a change in plotting/interpretation of the effective stresses with this option? (I studied the release notes, but did not find anything related, maybe I do not catch it).

2

Is it the same save file? Or did you recalculate it in 9.3? Can you send the save file and/or the data file to flac3dsupport@itascacg.com ?

3

thank you for following up. yes, it was the same *.sav file. Unfortunately, I did not keep the file. Cannot reproduce it currently. will definitely keep it next time (which I hope there will not be ;))