[Geoqus] Far Field Stresses

[Manooch Salehabadi]

Dear All,

hi and sorry for this simple question , i am just a beginner with ABAQUS.

i am trying to model a bore hole in mohr coulomb media (rock) with plain strain element CPE8RP, but i do not know how 

to include far field stress in the model?

i have used simple hollow cylindrical model with loading as following to simulate far field stresses:

 

*Step, name="Equilibrium Step", nlgeom=YES

*Soils, consolidation, end=PERIOD, utol=10., creep=none

100., 14400., 0.144, 14400., 

 

** LOADS

** 

** Name: Far Field Stress Type: Pressure

*Dsload

"Outer Boundary Surface", P, 24.

** Name: Mud Pressure-surface Type: Pressure

*Dsload

"wellbore Face", P, 20.

** 

unit is in MPa , i considered 24 Mpa as far field stress and 20 Mpa as borehole pressure ,also i have considered

18 Mpa as an initial pore pressure , but i didnot get reasonable results.!

i will be much appreciated for any comments.

Regards

Manooch 

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