Soldier pile retaining wall in clay - undrained or drained?
Soldier pile retaining wall in clay - undrained or drained?
(OP)
Hi,
I am designing a maximum 2m high soldier pile (steel H sections) in clay. It is a replacement for a similar wall that has rotted out. I don't know anything about the clay except that it is 'good and firm', and that the retained soil has water delivered to it from an uphill property. I am casting the piles into 300mm diameter concrete below the excavation.
I am trying to do an 'undrained' analysis using this document:
http: //vlee.utp l.edu.ec/V LEE/LinkCl ick.aspx?f ileticket= piymgNPD1d 4%3D&t abid=142&a mp;mid=520
There is a formula for the horizontal pressure at the depth of excavation: pressure = density*height - 2*Cu
As this has to be greater than 0, I have to limit the Cu I use depending on what height I am designing for (1m up to 2m). I end up getting an embedment depth of around 1.3m, independent of the retained height.
Am I going about this the right way? Should I be using undrained or drained analysis, given that the excavation has been in place for many years?
Thanks very much
I am designing a maximum 2m high soldier pile (steel H sections) in clay. It is a replacement for a similar wall that has rotted out. I don't know anything about the clay except that it is 'good and firm', and that the retained soil has water delivered to it from an uphill property. I am casting the piles into 300mm diameter concrete below the excavation.
I am trying to do an 'undrained' analysis using this document:
http:
There is a formula for the horizontal pressure at the depth of excavation: pressure = density*height - 2*Cu
As this has to be greater than 0, I have to limit the Cu I use depending on what height I am designing for (1m up to 2m). I end up getting an embedment depth of around 1.3m, independent of the retained height.
Am I going about this the right way? Should I be using undrained or drained analysis, given that the excavation has been in place for many years?
Thanks very much





RE: Soldier pile retaining wall in clay - undrained or drained?
www.PeirceEngineering.com
RE: Soldier pile retaining wall in clay - undrained or drained?
How do I justify that drained with no cohesion is suitable?
Do I use the same properties for the retained soil as the soil below the excavation depth?
Also, is 35H a US measurement ratio?
Thanks
RE: Soldier pile retaining wall in clay - undrained or drained?
www.PeirceEngineering.com
RE: Soldier pile retaining wall in clay - undrained or drained?
I'll try that and see how I go
RE: Soldier pile retaining wall in clay - undrained or drained?
Re; "How do I justify that drained with no cohesion is suitable?"
Using critical state OCC theory soil has no cohesion - only apparent cohesion due to dilation.
Check out
http://www2.eng.cam.ac.uk/~ans/