I'm not sure why you favor the intregral connection for this case. Usually, abutment applications, the sheet pile retain the fill for the abutment beam which can be concrete on h-pile or even a steel beam on h-pile. In either case the sheet pile is not, in any way, connected to the deck.
Some references that may be of use are:
USS Highway Design Handbook
USS Sheet Pile Design Booklet
You may be able to find these documents through AISC.org. But since they are old and probably no longer in circulation you may have to try a book retailer that deals with out-of-print publications.