Settlement analysis

One of the following methods is available to compute settlement:

- with the help of oedometric modulus

- with the help of compression constant

- with the help of compression index

- according to NEN (Buismann, Ladde)

- using the Soft soil model

- employing Janbu theory

- using DMT (constrained modulus)

The program offers two options to constrain the depth of influence zone:

- exploiting the theory of structural strength

- using the percentage of the magnitude of geostatic stress

The theory of elasticity (Boussinesq theory) is employed to determine stress in a soil state in all methods available for the settlement analysis.

General theories of settlement serve as bases in all the above methods.

When computing settlement below the footing bottom the programs first calculates the stress in the footing bottom and then determines the overall settlement and rotation of foundation.

The general approach in all theories draws on subdividing the subsoil into layers of a different thickness based on the depth below the footing bottom or ground surface. Vertical deformation of each layer is then computed – the overall settlement is then defined as a sum of partial settlements of individual layers within the influence zone (deformations below the influence zone are either zero or neglected):

where:	s	-	settlement
	si	-	settlement of the ith layer