hi I am nithin. i am working on wind turbine, i want to model a  wind turbine of 3MW considering Soil Structure interaction by replacing soil by springs( winkler method) in horizontal ,vertical, torsional direction.  for this how can i incorporated these springs to the foundation which i considered is circular foundation of radius 6.5m and depth of 3m as sample foundation . 

and how to give blade rotation as i don't know the geometry of blades i considered blades and nacelle as lumped mass on top of tower

help me 

thanks in advance