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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 a 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

-

incremetal stress

σor

-

geostatic stress

Depth of influence zone given by constraining the magnitude of primary stress