alexa <p>Variability in the Highway Geotechnical Properties of Two Residual Lateritic Soils from Central Nigeria</p> | OMICS International | Abstract
ISSN: 2381-8719

Journal of Geology & Geophysics
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Review Article

Variability in the Highway Geotechnical Properties of Two Residual Lateritic Soils from Central Nigeria

Owoyemi OO1* and Adeyemi GO2

1Department of Geology, Kwara State University, Malete, Nigeria

2Department of Geology, University of Ibadan, Nigeria

Corresponding Author:
Owoyemi OO
Department of Geology
Kwara State University, Malete, Nigeria
Tel: +234 811 567 8149
E-mail: [email protected]

Received Date: March 23, 2017; Accepted Date: April 25, 2017; Published Date: May 02, 2017

Citation: Owoyemi OO, Adeyemi GO (2017) Variability in the Highway Geotechnical Properties of Two Residual Lateritic Soils from Central Nigeria. J Geol Geophys 6:290. doi: 10.4172/2381-8719.1000290

Copyright: © 2017 Owoyemi OO, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Abstract

Sixty-four bulk samples of two residual lateritic soils forming the subgrade of the failed sections flexible highway pavement linking Ilorin to Mokwa in central Nigeria were investigated. This was with a view to determining the level of variation in the geotechnical properties of soil samples taken systematically within restricted area in two locations underlain by different bed rocks. One set was developed over sandstone formation of the Southern Bida Basin while the other set was developed over migmatite-gneiss. Consistency limits, grain size distribution, specific gravity, compaction, California Bearing Ratio (CBR), permeability and compressibility characteristics of these soils were determined using the British standard procedures 1377. Coefficient of variation was used to measure the degree of variation in the determined properties. The coefficients of variations for the sandstone derived soil (1.68% and 56.86%) are higher than that of the migmatite-gneiss derived soil (1.28%-54.40%). Permeability, linear shrinkage, and coefficient of volume compressibility possess the highest variability. Atterberg limits and derived indices, amount of fines, soaked and unsoaked CBR possess moderate variability, while moisture density parameters (MDD and OMC), natural moisture content and specific gravity exhibits the least variability. In order to prevent design errors, field sampling should be very thorough involving collection of several samples. This approach will eliminate wrong inferences often associated with results of testing of few samples

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