What could be some possible factors that would affect the friction between the concrete and surrounding soil across the length of a foundation pile under static load? Will the friction have different values at different depths for multiple soil layers?
The skin friction for the soil pile interaction is affected by the concrete shaft roughness (a precast pile has a lower coefficient of friction than an uncased bored pile), construction method (displacement piles e,g, driven piles, have a higher lateral pressure than bored piles), soil stiffness, soil type, overburden pressure and the possibility of soil relaxation. Soil water and drainage can have significant effects on the dynamic and static coefficients of friction.
You should look at the references in the Commentary of the Austroads 1992 Bridge Design Code for more information.
Thanks Gordon
Very helpful answer. I am first looking at the factors that affect the skin friction of bored piles and then how it is affected under additional thermal loading, as in the case of geothermal energy piles. The additional thermal load induces variable thermal strains throughout the pile which will have an effect on the skin friction. I will have a look at the reference you suggested to gain a deeper understanding.
Thanks
Faizal
Set-up is usually related to soil drainage. It will be greater and occur more quickly if the soil is made up of thin layers of clay and sand. False set is a related problem, when the water in the soil acts to resist driving.
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