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eng.deep-foundation-pile-skin-friction Calculator
Calculates skin friction capacity for driven piles using the β method (effective stress approach) for cohesionless soils. The β coefficient relates unit skin friction to effective vertical stress — values range from 0.1 (loose sand, deep) to 0.5 (dense sand, shallow).
Inputs
Pile Diameter Mm
Distance across a circle through its centre. Always confirm units match the rest of the calculation.
Pile Length M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Soil Undrained Shear Cu Kpa
Reference formula or conversion factor shown for context.
Adhesion Factor Alpha
A multiplier applied in the calculation.
Results
skin friction Qs (kN)
Sample size or count used in the calculation.
end bearing Qb (kN)
Sample size or count used in the calculation.
total pile capacity (kN)
The combined total across all inputs and components.
design load (FOS=2.5)
Sample size or count used in the calculation.
alpha method
The recommended calculation method or analytical approach for these conditions.
pile group efficiency
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.