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Compression Constant

When plotting the effective vertical stress against the vertical strain in the semi-logarithmic scale we often arrive at a linear dependency.

Detemination of compression constant C

Slope of this curve is one of the soil parameters particularly in case of one-dimensional deformation and is referred to as the compression constant C:

where:

σ1ef

-

initial effective stress of soil in oedometer

σ2ef

-

final effective stress of soil in oedometer

Margins of compression constant C (J.Šimek: Mechanika zemin)

Soil

Compression constant C [-]

Loess silt

15 - 45

Clay

30 - 120

Silts

60 - 150

Medium dense and dense sands

150 - 200

Sand with gravel

> 250