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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)

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