Basement wall design 2

[Gus14]

If soldier piles and lagging are used during the excavation of the basement. Would you design the basement walls as a pinned cantilever? Or do you assume the soldier piles will be sufficient to resist the soil pressures on the long term?

 

[KootK]

On the projects where I've used soldier piles and lagging:

1) The piles and lagging were not considered to be permanent support with respect to lateral soil and hydraulic pressures.

2) The basement walls were designed assuming them to be laterally supported at each building diaphragm. Where appropriate, continuity across diaphragms and into raft foundations was considered.

 

[Gus14]

Thank you kootk, for replying.

 

[milkshakelake]

Agreed 100% with the kootman. Even where soldier piles and lagging are considered permanent, like next to highways, they tend to rust and require lots of maintenance. I read somewhere that they have a lifetime of ~25 years, though some are maintained beyond that. For a basement wall, it's impossible to maintain because it's covered with concrete. It might be fully rusted and nobody will ever know.

 

[Gus14]

Thank you, milkshakelake, for replying. I myself design them as you and Kootk described, especially since the steel sections are not galvanized. I doubted myself because I reviewed structural plans where the EOR used 20 cm thick basement walls that span 5.5 meters, I advised increasing the thickness, and he did.