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GEO5 Software

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Unit Pile Base Resistance

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

where:

fb

-

technology coefficient

σefb

-

effective stress on the pile base

Nq

-

bearing capacity factor

qb,max

-

maximum limit for unit pile base resistance

φ

-

angle of internal friction

Unit resistance qb cannot be higher than the maximum limit of unit pile base resistance qb,max. This limit can be input manually or calculated in the "Vertical cap." frame.

According to CTE-DB SE-C the maximum limit for unit pile base resistance is 20000 kPa. If the soft soil layer with lower resistance is under the pile base, the qb,max is calculated according to the formula:

where:

D

-

pile diameter

H

-

distance of soft soil layer from the pile base

cu

-

undrained shear strength of the soft soil

Influence of soft soil layer

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