Hello,
I am tring to calculate loading test of small scale pile in ABAQUS CAE. Results which I get are rediculus. I am afraid it can be connected with invalid definition of geostatic state of stress (gravity g=10 m/s). I checked the units but there is ok with them.
Axisymmetric model dimensions:
Part-1 : 0.5m x 1m (horizontal x vertical) with 'hole ' for pile 0.035m x 0.45m (horizontal x vertical)
Part-2 : 0.035m x 0.45m (horizontal x vertical)
My dry sand is modelled with Mohr-Coulomn
density 1450kg/m^3
Young modulus E=40e6 Pa
Poisson ratio ni=0.3
friction angle fi=33deg
dilatancy angle psi=10deg
cohesion c=100 Pa
Pile properties (Elastic):
density 2400kg/m^3
Young modulus E=20e9 Pa
Poisson ratio ni=0.3
I define initial state of stress( EALL - set which is whole model soil+pile) by
*initial conditions type=stress, geostatic
EALL, -14500, -1, 0, 0, 0.5
When I check Frame-1vertical stress is like I defined and no vertical dispalcement occures
Frame-2 vertical stress changed (caused by the weight of pile) and significant values of displacement occured (also S12 and CSHEAR1 are not equal to 0)
Interaction between soil-pile (created in Initial step and propagated to all): tangential - penalty - friction coefficient 0.35
Two steps:
Step-1: Static, gravity load (whole model)
Step-2: Static, gravity load(propagated tron previous step) + displacement on the pile top (d=0,05m)
Problem is that the concentration of vertical stress is in soil under pile tip not as I expected in the pile head.
Does anybody know what can caused this kind of behaviour? and what is more important how to fix it?
Thank You in advance
Regards,
Anna
I am tring to calculate loading test of small scale pile in ABAQUS CAE. Results which I get are rediculus. I am afraid it can be connected with invalid definition of geostatic state of stress (gravity g=10 m/s). I checked the units but there is ok with them.
Axisymmetric model dimensions:
Part-1 : 0.5m x 1m (horizontal x vertical) with 'hole ' for pile 0.035m x 0.45m (horizontal x vertical)
Part-2 : 0.035m x 0.45m (horizontal x vertical)
My dry sand is modelled with Mohr-Coulomn
density 1450kg/m^3
Young modulus E=40e6 Pa
Poisson ratio ni=0.3
friction angle fi=33deg
dilatancy angle psi=10deg
cohesion c=100 Pa
Pile properties (Elastic):
density 2400kg/m^3
Young modulus E=20e9 Pa
Poisson ratio ni=0.3
I define initial state of stress( EALL - set which is whole model soil+pile) by
*initial conditions type=stress, geostatic
EALL, -14500, -1, 0, 0, 0.5
When I check Frame-1vertical stress is like I defined and no vertical dispalcement occures
Frame-2 vertical stress changed (caused by the weight of pile) and significant values of displacement occured (also S12 and CSHEAR1 are not equal to 0)
Interaction between soil-pile (created in Initial step and propagated to all): tangential - penalty - friction coefficient 0.35
Two steps:
Step-1: Static, gravity load (whole model)
Step-2: Static, gravity load(propagated tron previous step) + displacement on the pile top (d=0,05m)
Problem is that the concentration of vertical stress is in soil under pile tip not as I expected in the pile head.
Does anybody know what can caused this kind of behaviour? and what is more important how to fix it?
Thank You in advance
Regards,
Anna
