negative skin friction

[newbuilder]

Hello,

I have heard that a popular method of relieving negative skin friction on driven steel H piles is to coat them with bitumen. Does anyone have experience of this? Is it a reliable technique or does it boil down to the results from particular test piles on a site proving the theory?

NB

 

[Riz]

Its yet to be proven.
I will appreciate to learn about source of your information.
Negative skin friction occurs when soil pulls down the pile. Regions mostly effected are where u have incompletely consolidated soft caly, silt or organic soils. Normally fill and on grade supported slab cause -ve sf. A correct factor of safety should be considered when designing piles in such locations.

 

[newbuilder]

It is often mentioned in foundation texts although more commonly associated with tubular steel and concrete piles.

One test does mention that it is not cost effective to paint the piles so, since additional piles cost only a little more. That would be a regional conclusion though and i would like the members opinions.

I guess from the response to this message it is not popular!!!!!!