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Secondary Settlement

To describe a gradual creep of soil during secondary settlement the program employs the Buissman method (it incorporates the index of secondary compression Cα derived by Ladd). From observations suggesting that the soil deformation follows a linear path when plotted in the semi-logarithmic scale against time Buissman proposed the variation of ε due to long-term stress in the form:

where:

ε

-

total deformation

εp

-

deformation associated with primary consolidation

εs

-

deformation associated with secondary consolidation

t

-

time of consolidation

t0

-

reference time

Time-dependent variation of strain (primary and secondary consolidation)

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