Pile Shaft Resistance

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

where:	K_j	-	coefficient of lateral earth pressure in the j^th layer
	σ_{ef, j}	-	effective strength of soil in the j^th layer
	δ_j	-	pile skin friction angle (between pile material and surrounding soil in the j^th layer)
	A_sj	-	area of the pile shaft in the j^th 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:	α_j	-	skin friction coefficient in the j^th layer
	c_{u, j}	-	undrained cohesion in the j^th layer
	A_sj	-	area of the pile shaft in the j^th layer

GEO5