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 |