Developing Correlation Between Index Properties and Swelling Potential of Expansive Soils Found in Sendafa Town, Ethiopia
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Date
2015-11
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Addis Ababa University
Abstract
In this study, the relationship between index properties and swelling potential of expansive soil of
Sendafa Town is examined.
Soil swelling is a term generally applied to the ability of a soil to undergo large changes in volume due
to increased moisture content. One of the most important laboratory tests on expansive soils is the
swell test and indices. Commonly used laboratory index tests, (namely natural moisture content,
Atterberg limits, grain size analysis), and swelling pressure tests were conducted in order to estimate
the swelling potential of the Sendafa expansive soil.
The soil is classified under AASHTO and USCS classification system. The AASHTO classification of
the study area soil falls under A-7-5 and A-7-6 and this means the soil is plastic clay which has a high
volume change capacity between wet and dry states. The USCS classification indicates the soil is
inorganic clay of high plasticity (CH) with a potential of expansion.
Empirical correlations were proposed to relate index property parameters and swelling potential using
single and multiple linear regression analysis methods using Microsoft Excel program. From single
linear regression analysis plastic index has a better correlation than that of the other parameters
(indices) with comparison factors of R2 and P-Value. In the case of multiple linear regression analysis
dry density and plasticity index have a good combination effects with swelling. Results of the validity
of the newly developed correlation with control test results shows that, the correlation of swelling
potential value with soil index properties
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Geotechnical Engineering