Geotechnical influence of underlying soils to pavement failure in Southwestern Part of Nigeria / Ademila Omowumi

Omowumi, Ademila (2018) Geotechnical influence of underlying soils to pavement failure in Southwestern Part of Nigeria / Ademila Omowumi. Malaysian Journal of Sustainable Environment (MySE), 4 (1). pp. 19-36. ISSN 0128-326X

Official URL: http://www.myse.my/

Abstract

Roads in Nigeria are usually constructed without in-depth knowledge of the subsoil that serves as the foundation for the road elements. Road failures are often associated to poor construction materials or inadequate design without cognisance of the underlying soils. Engineering properties of ten bulk soil samples collected from the subgrade of Arigidi/Oke-Agbe highway were investigated to determine their suitability for highway pavement. Results show that all the subgrade soils below the failed locations have higher plasticity indices, which is an indication of their high swelling potential, and they are classified as A-7-6 clayey soils with high-water adsorption capability (16.1 – 22.4%) compared to subgrade soils from the stable locations. Low compacted density (1325 – 1928 Kg/m3 ), extremely poor CBR values; 8 – 31% (unsoaked) and 3 – 8% (soaked) which indicate percentage reduction in strength of the soils up to 77% on exposure to excessive moisture and the predominance of fines (> 59%) in the soils are responsible for the degree of instability. Furthermore, soft to low stiffness (49 – 131 kN/m2 ) and poor permeability of the subgrade materials underlying the pavement result to the failure characteristics witnessed. This study shows that the suitability and behaviour of subgrade soil is dependent on its engineering properties.

Metadata

Item Type: Article
Creators:
CreatorsID Num. / Email
Omowumi, Ademilaomowumi.ademila@aaua.edu.ng
Subjects: T Technology > TE Highway engineering. Roads and pavements > Roadside development. Landscaping
T Technology > TE Highway engineering. Roads and pavements > Pavements and paved roads
Divisions: Universiti Teknologi MARA, Perak > Seri Iskandar Campus
Journal or Publication Title: Malaysian Journal of Sustainable Environment (MySE)
Journal: UiTM Journal > Malaysian Journal of Sustainable Environment
ISSN: 0128-326X
Volume: 4
Number: 1
Page Range: pp. 19-36
Official URL: http://www.myse.my/
Item ID: 29545
Uncontrolled Keywords: Engineering properties; Failure characteristics; Permeability; Strength; Subgrade
URI: http://ir.uitm.edu.my/id/eprint/29545

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