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GEO5

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Pile Shaft Resistance

Pile shaft resistance for non-cohesive soils is given by:

where:

Kj

-

coefficient of lateral earth pressure in the jth layer

σef, j

-

effective strength of soil in the jth layer

δj

-

pile skin friction angle (between pile material and surrounding soil in the jth layer)

Asj

-

area of pile shaft in the jth layer

The lateral earth pressure coefficient K is back calculated by the program; however, its values can be manually modified in the "Add new soils" dialog window.

For cohesive soils the following expression holds:

where:

αj

-

skin friction coefficient in the jth layer

cu, j

-

undrained cohesion in th jth layer

Asj

-

area of pile shaft in the jth layer