Toe Capacity Load
Posted in Piles Engineering |
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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.
Can you ad a under ream piles design and calculation.