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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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