This is a short post in which I will elaborte on at some point in the future.
I am attaching a pdf of a TEDDS calculation that is based on the 1990 California Trenching and Shoring. The design concept is similiar to Cantilevered Soldier Pile Wall Design.
Attachment: Soldier Pile Design w-Anchor Cali TnS 1990
Here is the link to the manual: http://www.vulcanhammer.net/geotechnical/TrenchingandShoring.pdf
And new 2011 manual which is also very helpful: