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)