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Pile Shaft Resistance

Pile shaft resistance is given by:

where:

τs,i

-

unit pile shaft resistance in the ith layer

As,i

-

area of the pile shaft in the ith layer

Unit pile shaft resistance for non-cohesive soils is given by:

where:

σef

-

effective stress in the soil layer

Ks

-

coefficient of lateral earth pressure

fs

-

technology coefficient

φ

-

angle of internal friction

τs,max

-

maximum limit for unit pile shaft resistance

According to CTE-DB SE-C the maximum limit for unit pile shaft resistance in non-cohesive soil is 120 kPa.

For cohesive soils, the following expression holds:

where:

cu

-

undrained shear strength of soil

τs,max

-

maximum limit for unit pile shaft resistance

According to CTE-DB SE-C the maximum limit for unit pile shaft resistance in cohesive soil is 100 kPa.

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