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Theory of Structural Strength

The structural strength represents the resistance of soil against deformation for a load at the onset of failure of its internal structure. With decreasing coefficient m the soil responds tends to be linear.

If the structural strength is accounted for during settlement analysis, then:

a) the influence zone is characterized  by the depth below the footing bottom at which the increment of vertical stress σ_z becomes equal to the structural strength of soil (determined by multiplying the original geostatic stress σ_or by the coefficient m):

b) when computing the settlement of a layer, the increment of vertical stress σ_z due to surcharge and reduced by the structural strength of the soil is provided by:

and the settlement s then follows from the stress denoted in figure by hatching and is given by:

Depth of influence zone based on theory of structural strength (area of effective surcharge is hatched)