Are there any design tools on Engineers Edge (Spreadsheet calculators) that I can use to design a root cellar or concrete Vault? It is actually a very unique situation but if I can design the main 10' wall retaining the soil portion then I can down size the rest according to the unique situation. I don't want to design it as a retaining wall as I will have a steel beam system at the top preventing the overturning but at the floor the owner want to leave it as dirt so I would need to have enough sliding resistance and or use the side walls that are spaced about 15' apart and essentially a grade beam to resist the pressures.

Really weird one for me but I think if there is a concrete vault design I can then modify it to my situation.

thanks in advance!