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Frictional Piles works on the static friction developed between the surface of the pile and soil where it is placed. Where as End-Bearing Piles are driven till hard strata of soil is achieved.
a friction pile gets his bearing load mostly from friction along the shaft. A bearing pile gets his bearing load mostly form its resistance at its pile point, normally these are very short piles
We normally use frictional pile when we discover by geotechnical investigation that the hard strata(e.g. Rock etc) lies at unreachable depth(lets say more than 60m) and it would be difficult to execute with available machinery of such capacity.So what we do , we provide frictional pile in that case whose purpose is to transfer large structural imposed loads to soil instead of t
ransfering to endtip of pile.
Similarly when hard strata is found at reachable depth( lets say less than 40m) we transfer superimposed load to endtip, this type of pile is end bearing.
end bearing pile is used when the hard strata is found at negotiable depth from the surface and the load is directly transferred to from the pile to the hard strata at the end of the pile
Whereas friction pile is used when the hard strata is deep below a negotiable depth and the friction of pile surface with the soil is used to bear the load of the structure.
End Bearing Pile: Typical end-bearing piles are driven through very soft soil, such as a loose silt-bearing stratum underlain by compressible strata. Remember this factor when determining the load the piles can support safely.Friction pile:
When a pile is driven into soil of fairly uniform consistency and the tip is not seated in a hard layer, the load-carrying capacity of the pile is developed by skin friction. The load is transferred to the adjoining soil by friction between the pile and the surrounding soil. The load is transferred downward and laterally to the soil is called friction pile.
that depend on soil profile
the tip of the pile rested on denese sand you should depend on the end bearing capacity and if the pile poured in clay soil so it's the time for friction bond.
the friction pile carrying loads by frictions only but bearing piles carrying loads by bearing and friction
the friction pile in which the depth is smaller and it is approximately 19 meter and end bearing pile in which depth is larger and it is approximately 33 meter
