today played around the geostatic balance of a rigid body inside the soil:
1. use initial stress, gostatic, got the result called stage0.csv
2. use stage0.csv as the initial input stress and got the stage1.csv
3. iterate 2 till stage5
4. compare the difference between 2 consecutive stages and the results showed that the difference is also similar. small enough.
Conclusion: if the initial stress, geostatic can balance, use it. no need to do another round.