Typical EFP? 3

[SKIAK]

What are some "typical" values that get used for EFP?

I'm asking because I've been doing some work on a few reinforced concrete retaining walls recently. My supervisors pass off the important information and I go to work. With geotech and loading info in hand I try to keep sizes for my walls in general dimensions (all references I have say pretty much the same but looking specifically from Bowles "Foundation Analysis and Design" chapter 12-2 page 433... just so you know where I'm coming from). I have a hard time coming up with these dimensions and my supervisors are always suprised at how thick my walls are, how long my footings are for sliding (they would prefer that I didn't use keys), and how much rebar I have. After doing a little searching around it seems to me that the EFP that I get off the geotech report (60pcf for clay/silty) is a fairly high number in the spectrum of soils, which might be why (I'm hoping) that my layouts end up so large. Any thoughts?

 

[SKIAK]

NFS stands for non frost susceptible. It will be built in a cold region so there is a lot of care taken to help prevent water from getting behind the wall, lots of drainage, and keeping frost susceptible soils away from the back of the wall.

 

[fattdad]

It seems like the geotechnical engineer feels the friction angle of the "silt" fill will be low. Don't know if there is any local precident for that, but if so, then the higher EFP would be appropriate.

f-d

¡papá gordo ain’t no madre flaca!