contact problem in Geostatic step.

[Chen1]

Hello There,

I am running a geostatic step for my model, the model is composed of 3 layers Roof, coal, and floor. the coal layer is sandwitched between the roof and the floor. When i run the geostatic step, i found that the roof and the floor penetrate the coal layer completely and they touches each other. This is strange.

I fix the bottom of the model in X, Y and Z, the model is X-Symmetry.
the units used in the model is lb, ft. I think nothing is wrong with the units.

this is the input file, please help me.

Thank you.

 

[Chen1]

Hello

Problem solved, When i changed the NLgeom to ON, i do not see that problem.