soil nail interaction

Hi,

Im modeling soil nail wall subjected to freeze-thaw ( sinusoidal temp variation) by sequentioally coupled temp-displacement., using abaqus .i managed to capture the heat transfer and model the heaving. now im looking to define the interaction between soil and nail in order to obtain stress and strain distribution along nail. however, i donno to define the interaction and their property, was wondering if anyone can give me some advice over the matter ive mentioned.

Any help is really appreciated