International Journal of
Water Resources and Environmental Engineering

  • Abbreviation: Int. J. Water Res. Environ. Eng.
  • Language: English
  • ISSN: 2141-6613
  • DOI: 10.5897/IJWREE
  • Start Year: 2009
  • Published Articles: 311

Full Length Research Paper

Probability functions of road failures in a typical basement complex region, South-western Nigeria: A case study of Akure - Oba Ile Airport Road

Oyedele Akintunde Akinola
  • Oyedele Akintunde Akinola
  • Department of Physics, Ekiti State University, Ado – Ekiti, Ekiti State, Nigeria.
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Bawallah Musa Adesola
  • Bawallah Musa Adesola
  • Department of Applied Geophysics, Federal University of Technology, Akure, Ondo State, Nigeria.
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Ozegin Kesyton Oyamenda
  • Ozegin Kesyton Oyamenda
  • Department of Physics, Ambrose Alli University, Ekpoma, Edo State, Nigeria.
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Ilugbo Stephen Olubusola
  • Ilugbo Stephen Olubusola
  • Department of Applied Geophysics, Federal University of Technology, Akure, Ondo State, Nigeria.
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Ajayi Christopher Ayodele
  • Ajayi Christopher Ayodele
  • Department of Geology, Ekiti State University, Ado Ekiti, Ekiti State, Nigeria.
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Aigbedion Isaac
  • Aigbedion Isaac
  • Department of Physics, Ambrose Alli University, Ekpoma, Edo State, Nigeria.
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  •  Received: 07 December 2019
  •  Accepted: 10 March 2020
  •  Published: 30 April 2020

Abstract

In this study, effort has been made to achieve a comprehensive geophysical investigation on immediate and remote causes of structural/foundation failures, specifically highway(s) within the southwestern basement complex region of Nigeria. Geophysical survey involves the use of Very Low Frequency Electromagnetic method (VLF-EM) which was complemented with electrical resistivity method using two techniques; 2D Electrical Resistivity Tomography (ERT) and Vertical Electrical Sounding (VES) along Akure/Oba-Ile Airport Road, which covers a pilot test of 600 m. The VLF-EM survey produced EM anomalies and identified possible linear features along the study area. The results obtained from the VES were used to determine the second order parameters for determination of subsurface integrity/competence. The geoelectric sections identified three to five geoelectric/geologic subsurface layers along the traverse. The ERT gave information on the subsurface characteristics whose section delineated five major geologic layers comprising of the topsoil, weathered basement, fractured zone, partly fractured basement and the fresh basement. This shows that fracture and weathering are responsible for the structural failures along the study area which are products of probability functions of geodynamics. The methodology can be adopted as a model to proficiently and quickly detect changes in subsurface resistivity, integrity and identify anomalous zones which can serve as useful tool in the understanding of the probability functions of geodynamics that can bring structural and foundation failures within the basement complex region.

Key words: Road, longitudinal conductance, subsurface integrity, dipole-dipole, geoelectric section, very low frequency.