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Tomlinson

This widely used method adopts undrained shear strength parameters to calculate the pile bearing capacity. It further assumes that the pile shaft resistance depends on the pressure due to overburden surcharge.

The pile shaft resistance is given by:

where:

ca, j

-

adhesion in the jth layer (shear stress between the pile skin and the surrounding soil)

As, j

-

area of pile shaft in the jth layer

αj

-

empirical adhesion coefficient (depends on the type of soil, type of pile, etc.) in the jth layer

cu, j

-

undrained cohesion in the j-th layer (undrained shear strength)

The empirical adhesion coefficient α is back calculated by the program. Its values, however, can be manually adjusted in the "Add new soil" dialog window.

The pile base resistance is given by:

where:

qb

-

unit pile base resistance

Ab

-

pile base area

cu

-

undrained shear strength