The 'skin friction' component of a pile capacity is developed by:
Choose the correct answer
Point bearing on rock at pile tip
Shear stress (friction + adhesion) mobilised along the pile shaft by load transfer to surrounding soil
Passive earth pressure on pile
Concrete tensile strength in pile
Correct Answer
B. Shear stress (friction + adhesion) mobilised along the pile shaft by load transfer to surrounding soil
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Skin (shaft) friction: shear stress between pile surface and surrounding soil. For pile in clay: Qs = α × Su × π × D × L (α method; α = adhesion factor ≈ 0.45–0.75). For pile in sand: Qs = K × σv' × tanδ × A (β method; K = lateral earth pressure, δ = pile-soil friction, σv' = effective vertical stress). Dominant for friction piles in clay.
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