Method of Restriction of the Primary Stress Magnitude
If we assume in the settlement analysis the constrains in terms of the percentage of primary geostatic stress, then:
a) the influence zone is represented by the depth below the footing bottom where the incremental stress σz reaches a certain percentage of the original geostatic stress:
where: | x% | - | considered magnitude of the geostatic stress |
σo | - | geostatic stress |
b) the settlement s is derived from stress value denoted in figure by hatching and it receives the form:
where: | σz | - | incremenatal stress |
σor | - | geostatic stress |
Depth of influence zone given by constraining the magnitude of primary stress