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Base Resistance of Bored Pile

Pile base resistance is calculated as follows:

where:

k1

-

factor of increasing base resistance due to pile length L

As

-

pile base area

qdp

-

bearing capacity at the pile base

Note: The determination of coefficient of increasing base resistance due to pile length k1 is explained in chapter 6.4.1.3

Bearing capacity at the pile base in drained soils is given by:

where:

Nc, Nq, Nγ

-

bearing capacity factors

for

for

cd

-

soil cohesion at the pile base

φd

-

angle of internal friction

γ1

-

average soil weight along the pile

L

-

pile length

γ2

-

soil weight below the pile base

d

-

pile diameter

For undrained soils, the following expression holds:

where:

cu

-

undrained cohesion at the pile base

q

-

total vertical stress at the pile base

Literature:

CSN 73 1004 (July 2020)

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