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In case of piles being driven in cohesive soils, the ultimate load is alculated by using the followinf formula

Qbu=Abq=AbNccu

where
Ab = End bearing area of pile
q= bearing capacity of soil
Nt =bearing capacity factor
cu= Un-drained shear strength of soil within zone 1 pile diameter above and 2 diameters below pile tip

The value of Nc varies from 8-12 but normally we take the value to by 9

For Cohesionless soils
In case of cohesionless soils, the toe resistance q is calculated as
q=NNq (sigma)’vo<=qt

For Piles driven in Sand
ql=0.5Nq tan(phi)

where
phi= friction angle of the bearing soils below the critical depth.

### Kanwarjot Singh

Kanwarjot Singh is the founder of Civil Engineering Portal, a leading civil engineering website which has been awarded as the best online publication by CIDC. He did his BE civil from Thapar University, Patiala and has been working on this website with his team of Civil Engineers.

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## One comment on "Toe Capacity Load"

Parthiv Patel says:

Can you ad a under ream piles design and calculation.