When setting up a solid-structure interaction analysis, consider the following recommendations:
Recommended element types for 2D and 3D soil analyses are:
Use the enhanced strain formulation option.
Applying an in situ stress state should result in an elastic deformation state. If this is not the case, the loading conditions and material properties may be incompatible.
To ensure conformity of the specified stress state and outside loading, always apply initial state (INISTATE) in a single substep.