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Influence of Foundation Depth and Incompressible Subsoil

When computing settlement it is possible to account for the influence of the foundation depth by introducing the reduction coefficient κ1:

for strip footing:

for spread footing:

where:

d

-

depth of the footing bottom

z

-

depth under footing bottom

Influence of incompressible layer is introduced into the analysis by the reduction coefficient κ2:

where:

zic

-

depth of rigid base under footing bottom

z

-

depth under footing bottom

Incorporating the above coefficients allows the transformation of the vertical component of stress σz such that the actual depth is replaced by a substitute value zr given by:

where:

κ1

-

coefficient of  footing bottom depth

κ2

-

coefficient of the rigid base

z

-

depth under footing bottom

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