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GEO5

Geotechnical software

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Overconsolidation index of secondary compression

The overconsolidation index of secondary compression depends on laboratory measurements (e.g. one-dimensional consolidation) and is proportional to the logarithm of time and slope of virgin consolidation line providing the preconsolidation pressure was not exceeded:

where: Cαr - overconsolidation index of secondary compression
ε - deformation of a soil layer
t1 - initial time of a period of monitoring (measured from the onset of consolidation)
t2 - final time of a period of monitoring



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