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 |