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:
jth layer (shear stress between the pile skin and the surrounding soil)in the
area of pile shaft in the jth layer
jth layer(depends on the type of soil, type of pile, etc.) in the
undrained cohesion in the j-th layer (undrained shear strength)
The α is back calculated by the program. Its values, however, can be manually adjusted in the " " dialog window.
The pile base resistance is given by:
unit pile base resistance
pile base area
undrained shear strength