Correlation of CBR with Index Properties of Soils in Sululta Town
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Date
2017-05
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Publisher
AAU
Abstract
Soils are the oldest and most complex engineering materials. The California Bearing Ratio (CBR)
has been acknowledged as an important parameter to characterize the bearing capacity of earth
structures, such as earth dams, road embankments, airport runways, bridge abutments and
pavements.
This research presents and discusses the results from a study on the prediction of CBR. In the
current study, CBR testswere performed on thirty one samples of fine-grained soils in the
laboratory, collected from various locations in Sululta Town. Based on the test results, the soils are
categorized in to red clay and black/gray clay soils and the correlationswere done independently for
the two categories.
Then various linear relationships between index properties and CBR of the samples were
investigated using simple and multiple linear regression analysis, predictive equation estimating
CBR from the experimental index values were developed by multiple linear regression analysis and
alesser empirical correlation was found with a correlation coefficient R
2
= 0.319for Red clay and
satisfactory empirical correlation was obtained with a correlation coefficient R
2
=0.720for
black/gray clay of the experimental soils. The equations are developed by using SPSS 23 for
windows software. The equations are then tested for two control samples for the two categories.
The most important equations are proposed, and applicable with sufficient accuracy for preliminary
identification of material for the local area.
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Keywords
CBR, Properties of Soils, Sululta Town