Geophysical Investigation for Post Foundation Studies at Ikekogbe Primary School, Ekpoma, Edo State, Nigeria
American Journal of Environmental and Resource Economics
Volume 4, Issue 2, June 2019, Pages: 73-83
Received: May 18, 2019; Accepted: Jun. 26, 2019; Published: Jul. 8, 2019
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Authors
Aigbedion Isaac, Department of Applied Geophysics, Federal University of Technology, Akure, Nigeria
Bawallah Musa, Department of Applied Geophysics, Federal University of Technology, Akure, Nigeria
Ilugbo Stephen, Department of Applied Geophysics, Federal University of Technology, Akure, Nigeria
Osaigbovo Aize Diana, Department of Physics, Ambrose Ali University Ekpoma, Edo, Nigeria
Diana Emmanuela Kehinde, Department of Physics, Ambrose Ali University Ekpoma, Edo, Nigeria
Ihewkwumere Chinenyeollins, Department of Physics, Ambrose Ali University Ekpoma, Edo, Nigeria
Igbinoba Collins, Department of Physics, Ambrose Ali University Ekpoma, Edo, Nigeria
Patrick Promise Uduak, Department of Physics, Ambrose Ali University Ekpoma, Edo, Nigeria
Amagbamwan Ebenihita, Department of Physics, Ambrose Ali University Ekpoma, Edo, Nigeria
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Abstract
This research showed the significance of electrical resistivity method for foundation studies at Ikekogbe Primary School, Ekpoma, Edo State, Nigeria. The aim of the study is to assess the building in the area that was intensively affected by cracks resulting in structural instability. The Electrical Resistivity method involved three techniques; Vertical Electrical Sounding (VES), 2-D Electrical Resistivity Tomography (ERT) and Horizontal Profiling (HP) which covers a pilot test of 60 meters. Eight (8) VES were carried out using Schlumberger array with current electrode spacing varying from 1 to 40 m, with 2-D ERT using Dipole-Dipole electrode array with inter-station separation of 5 m and an expansion factor that varied from 1 to 5 and HP using Wenner array with an electrode spacing of 5 m interval. The results obtained from the VES delineated three geoelectric units which comprise of topsoil, clayey sand and sandstone formation. The 2 D imaging (Dipole-Dipole) gave information on the subsurface characteristic in the area with low apparent resistivity which indicates low competence material. The Wenner profile is characterised by low resistivity. All the results correlate well with one another showing that all the techniques used are complemented and also deduced that the failures of these buildings arise from incompetent clay materials and lateral inhomogeneity. Evidence has shown that a suspected weak zone cut across the study area and the weak zones contributed a great deal to the cracks observed on the classroom block. The presence of clay materials beneath the classroom also contributed to the cracks observed. It is therefore recommended that future engineering construction should consider possible weak zones before designing or imposed structure as such can instigate failure in the proposed structure.
Keywords
Dipole Dipole, Geoelectric Section, Wenner Profiling, Incompetent Materials, Foundation Integrity
To cite this article
Aigbedion Isaac, Bawallah Musa, Ilugbo Stephen, Osaigbovo Aize Diana, Diana Emmanuela Kehinde, Ihewkwumere Chinenyeollins, Igbinoba Collins, Patrick Promise Uduak, Amagbamwan Ebenihita, Geophysical Investigation for Post Foundation Studies at Ikekogbe Primary School, Ekpoma, Edo State, Nigeria, American Journal of Environmental and Resource Economics. Vol. 4, No. 2, 2019, pp. 73-83. doi: 10.11648/j.ajere.20190402.14
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Copyright © 2019 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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