Skin friction for tension in layered soil

[highlander1]

Hi all,
I’m having some troubles finding the best method to simulate skin friction in rammed piles for tensional forces. Currently I’m working with Das&Seely method but doesn’t works properly for a layered soil under my opinion.
Any recommendations for such situations?

Thank you,

 

[MotorCity]

Two ideas.....

Apply the lowest value of skin friction from the various soil layers over the entire pile length

OR

Measure the results from a test pile

 

[EireChch]

Standard skin friction methods for clay and sand can be applied together.

 

[fattdad]

make a weighted average.

f-d

ípapß gordo ainÆt no madre flaca!

 

[ATSE]

Consider using the Beta method as advanced by Fellenius (all soils and states, not just sandy)