IBC 1810.2.1

[MacGruber22]

1810.2.1 Lateral support.
Any soil other than fluid soil shall be deemed to afford sufficient lateral support to prevent buckling of deep foundation elements and to permit the design of the elements in accordance with accepted engineering practice and the applicable provisions of this code.

Where deep foundation elements stand unbraced in air, water or fluid soils, it shall be permitted to consider them laterally supported at a point 5 feet (1524 mm) into stiff soil or 10 feet (3048 mm) into soft soil unless otherwise approved by the building official on the basis of a geotechnical investigation by a registered design professional.

My question is this: is there any way to utilize this clause for preliminary sizing of soldier pile walls?

 

[msquared48]

I don't see why not for prelim.

Mike McCann, PE, SE (WA)

 

[MacGruber22]

So, what would the FBD of the passive resistance look like with that fixity assumption?

 

[MacGruber22]

Although, the diagram in the attachment isn't really accurate it satisfies equilibrium.