Toe Capacity Load

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

Q_bu=A_bq=A_bN_cc_u

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

The value of N_c 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=NN_q (sigma)’_vo<=q_t

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

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