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GEO5

Geotechnical software

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Recompression index

The recompression index Cr is determined from the graph representing the variation of void ratio e as a function of the effective stress σef plotted in the logarithmic scale for unloading – reloading sequence:

Determination of recompression index Cr

where: Δe - change of void ratio for the unloading-reloading curve
Δlogσef - change of effective stress for the unloading-reloading curve

If no results from either laboratory or in situ measurements are available, the recompression index Cr can be approximately derived from:

where: Cc - compression constant



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