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Circular earth retention wall design methods

Circular earth retention wall design methods

Circular earth retention wall design methods

(OP)
Contractor is responsible for design of temporary ERS for a launching and receiving shaft for a sewer tunnel.  Inside diameter 35 feet and excavation depth 42 feet.  Contractor proposing a secant pile wall with 2 foot diameter auger cast piles, every other pile steel reinforced.  His design analysis is based on a lateral load pile program, and further supplemented with a structural software program modeling the ERS shaft as a concrete tank below ground.  Has anyone ever heard or seen an attempt to model/analyze a circular ERS shaft in this manner?

RE: Circular earth retention wall design methods

No direct experience on this. Just a little thought.

1. The pile is critical at driving/construction stage only.
2. Upon completion, the pile wall subjects to axial compression mainly, if properly aligned.

Looks like his method is ok (to me).

RE: Circular earth retention wall design methods

Whalers and bracing are critical in maintianing the piles as an integral unit.

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