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Pile Shaft Resistance

The bearing capacity of the pile shaft in cohesionless soils is given by the formula:

where:

K

-

coefficient of lateral earth pressure

σef

-

effective stress at the middle of the layer

δ

-

pile skin friction angle (between pile material and surrounding soil)

fs,i

-

shaft resistance in the ith layer

fs,lim

-

pile limit shaft resistance in the ith layer

As,i

-

area of the pile shaft in the ith layer

Coefficient of lateral earth pressure K depends on the pile base:

  • unplugged pile: K = 0.8
  • plugged pile: K = 1.0

For cohesive soils, the following formula applies:

where:

α

-

adhesion coefficient in the layer

cu

-

total cohesion in the ith layer

Adhesion coefficient α and limit shaft resistance fs,lim are calculated by the program automatically, or it is also possible to input them manually in the "Adding new soils" dialog window.

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