The amount of compression a soil will experience depends, among other factors, on its compression index Cc which may be determined through consolidation tests on undisturbed or remolded soil samples. Alternatively empirical relationships between Cc and other physical properties such as liquid limit or void ratio may be used.
It has been postulated that empirical relationships between Cc and other readily determined soil properties are of much practical importance especially during planning stages, because these relationships permit computations of approximate settlements of structures founded on cohesive soils without the benefit of conducting consolidation tests. These empirical relationships form the basis on which rational decisions can be made as to the suitability of a foundation site.
The data from more than 130 consolidation tests performed on cohesive soils are statistically examined. Ordinary least squares and ridge regression techniques are used to obtain linear models for the variable Cc and the results are compared with published results. It is concluded that a simple linear relationship between the compression index and the initial water content yields highly significant results.
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