Shaft Resistance of Bored Pile
Pile shaft resistance is calculated as follows:
where: | di | - | pile diameter in soil layer |
hi | - | layer thickness | |
qsi | - | shaft friction in soil layer |
Shaft friction in drained soils is given by:
where: | σxi | - | contact stress in layer |
φd | - | angle of internal friction in layer | |
γr1 | - | coefficient of pile technology | |
γr2 | - | coefficient of foundation soil | |
cd | - | soil cohesion in layer | |
k2 | - | coefficient of lateral soil pressure (k2 = 1,00) | |
σor | - | geostatic stress at center of layer |
Note:
The values of coefficient of pile technology γr1 are given in chapter 6.4.1.6.
The determination of coefficient of foundation soil γr2 is explained in chapter 6.4.1.5.
For undrained soils, the following expression holds:
where: | cad | - | adhesion |
Literature:
CSN 73 1004 (July 2020)