I have a short list of references that may help you:
B.C. Simonsen, 1997, "Mechanics of Ship Grounding", Ph.D thesis, Department of Naval Architecture and offshore Engineering, Technical University of Denmark, Lyngby, Denmark
B.C. Simonsen and T. Wizbecki, 1996, "Grounding Bottom Damage and ship Motion over a Rock", International Journal of Offshore and Polar Engineering, Vol.6, No. 3, September.
J. McQuillan, 2002, "Modeling Dynamic Ground Reaction to Predict Motion of and loads on Stranded Ships in Waves, Tesis, Faculty of Virgina Polytechnica Institute and State University, Blacksburg, Virginia.
Some of this may not directly apply to your project, but it is a start and may lead you in the right direction.