Geotechnical challenges in crystalline basement terrain: mapping subsurface conditions with electrical resistivity tomography in Ado-Ekiti, Nigeria
DOI:
https://doi.org/10.14295/bjs.v4i4.726Keywords:
competence, geotechnical, imaging, inhomogeneity, resistivityAbstract
Subsoil investigation constitutes a critical step in the planning and execution of any construction project. It is a prerequisite for the design and construction of safe, stable, and sustainable structures. Subsoil investigation using Electrical Resistivity Tomography (ERT) was carried out in Ado-Ekiti, Nigeria to assess the integrity of foundation soils/near-subsurface geomaterials. The study area is underlain by the crystalline basement terrain of southwestern Nigeria. The study delineated low resistivity zones having as low as 63 Ωm at a depth of about 10 m, localized pockets of clay intercalated by lateritic soil, a stretch of geomaterials of high resistivity values over 10000 Ωm observed at a depth of 6 m, and a structural feature diagnostic of fractured zone with intense weathering at depths stretching beyond 25 m. The presence of an underground water channel within the fractured basement rock is significant. The geological variations along the traverses confirm the heterogeneity of the basement complex rocks, even over short distances. This is crucial for foundation design. A gross assumption of uniformity could be hazardous to the stability of the structure. Geophysics remains a very fundamental tool that can be applied in civil engineering work. Use of integrated geophysical methods would reduce ambiguities and enhance site characterization for construction purposes.
References
Adelekan, A., Igbasan, A., & Oladunjoye, M. (2017). Integration of Electrical Resistivity and Ground Penetrating Radar Methods for Site Characterization: a Case study of Ajibode Area, Ibadan, Southwestern Nigeria. International Journal of Environmental Sciences and Natural Resources, 1(3), 555-564. DOI: https://doi.org/10.19080/IJESNR.2017.01.555564
Adebo, B. A., Makinde, O. E., & Ilugbo, S. O. (2021). Application of Electrical Resistivity Method to Site Characterisation for Construction Purposes at Institute of Agriculture Research and Training Moor Plantation Ibadan. Indonesian Journal of Earth Sciences, 1(2), 49-62. DOI: https://doi.org/10.52562/injoes.v1i2.248
Ademilua, O. L., Eluwole, A. B., & Bawallah, M. (2015). Geophysical investigations for subsurface integrity assessment and its implications on existing and proposed buildings around the southwestern part of the Ekiti State University Campus, Ado-Ekiti, Southwest Nigeria. International Journal of Advancement in Engineering Technology, Management and Applied Science, 1(3), 1-10.
Aizebeokhai, A. P., Oni, A. A., Oyeyemi, K. D., & Ogungbade, O. (2018). Electrical resistivity imaging (ERI) data for characterising crystalline basement structures in Abeokuta, southwestern Nigeria. Data in Brief, 19, 2393-2397. https://doi.org/10.1016/j.dib.2018.07.034 DOI: https://doi.org/10.1016/j.dib.2018.07.034
Alam, M. J. B., Ahmed, A., & Alam, M. Z. (2024). Application of electrical resistivity tomography in geotechnical and geoenvironmental engineering aspect. Geotechnics, 4, 399-414. https://doi.org/10.3390/ geotechnics4020022 DOI: https://doi.org/10.3390/geotechnics4020022
Alhussein, A. B., & Nouran, S. S. (2022). Application of ERT and SSR for geotechnical site characterization: A case studyfor resort assessment in New El Alamein City, Egypt, NRIAG Journal of Astronomy and Geophysics, 11(1), 58-68. https://doi.org/10.1080/20909977.2021.2023999 DOI: https://doi.org/10.1080/20909977.2021.2023999
Andrews, N. D., Aning, A. A., Danuor, S. K., & Noye, R. M. (2013): Geophysical investigations at the proposed site of the Kwame Nkrumah University of Science and Technology (KNUST) teaching hospital building Kumasi, Ghana, using 2D and 3D resistivity imaging techniques. International Resource Journal of Geology and Mining, 3(3), 113-123.
Arekumo, T., & Lawrence, O. O., (2019). Evaluation of lateritic soil from field resistivity data at Okada, South-South, Nigeria. International Journal of Science and Research, 8(6), 2188-2192.
Coker, J. O. (2015). Integration of geophysical and geotechnical methods to site characterization for construction work at the school of management area, Lagos State Polytechnic, Ikorodu, Lagos, Nigeria. International Journal of Energy Science & Engineering, 1(2), 40-48.
Dippro for Window. (2000). Dippro™ Version 4.0. Processing and interpretation software for Dipole-dipole electrical resistivity data. KIAM, Daejon.
Fajana, A. O., Olaseeni, O. G., Bamidele, O. E., & Olabode, O. P. (2016). Geophysical and geotechnical investigation for post foundation studies, Faculty of Social Sciences and Humanities, Federal University Oye Ekiti. Journal of Engineering and Technology, 1, 62-66. DOI: https://doi.org/10.46792/fuoyejet.v1i1.17
Hasan, M., Shang, Y., Jin, W. J., & Akhter, G. (2020). An engineering site investigation using non-invasive geophysical approach. Environmental Earth Sciences, 79, 265. https://doi.org/10.1007/s12665-020-09013-3 DOI: https://doi.org/10.1007/s12665-020-09013-3
Hasan, M., Shang, Y., Meng, H., Shao, P., & Yi, X. (2021). Application of electrical resistivity tomography (ERT) for rock mass quality evaluation. Scientific Reports, 11, 23683. https://doi.org/10.1038/s41598-021-03217-8 DOI: https://doi.org/10.1038/s41598-021-03217-8
Jabrane, O., Martínez-Pagán, P., Martínez-Segura, M. A., Alcalá, F. J., El Azzab, D., Vásconez-Maza, M. D., & Charroud, M. (2023). Integration of electrical resistivity tomography and seismic refraction tomography to investigate subsiding Sinkholes in Karst Areas. Water, 15, 2192. DOI: https://doi.org/10.3390/w15122192
Joseph, T. A., Lukumon, A., Temitayo, O. J., Geraldine, C. A., & Taofik, A. (2023). Subsurface Integrity Assessments of a Proposed Plaza Building at Oniru Lekki, Lagos, South-western Nigeria, Using Geoelectrical and Geotechnical Methods of Investigations. Suan Sunandha Science and Technology Journal, 10(1), 74-91. https://doi.org/10.53848/ssstj.v10i1.425 DOI: https://doi.org/10.53848/ssstj.v10i1.425
Loke, M. H., Chambers, J. E., Rucker, D. F., Kuras, O., & Wilkinson, P. B. (2013). Recent Developments in the Direct - Current Geoelectrical Imaging Method. Journal of Applied Geophysics, 95, 135-156. DOI: https://doi.org/10.1016/j.jappgeo.2013.02.017
Metwaly, M., & AlFouzan, F. (2013). Application of 2-D geoelectrical resistivity tomography for subsurface cavity detection in the eastern part of Saudi Arabia. Geoscience Frontiers, 4(4), 469-476. https://doi.org/10.1016/j.gsf.2012.12.005 DOI: https://doi.org/10.1016/j.gsf.2012.12.005
Olayanju, G. M., Mogaji, K. A., Lim, H. S., & Ojo, T. S. (2017). Foundation integrity assessment using integrated geophysical and geotechnical techniques: Case study in crystalline basement complex, southwestern Nigeria. Journal of Geophysics and Engineering, 14(3), 675-690. https://doi.org/10.1088/1742-2140/aa64f7 DOI: https://doi.org/10.1088/1742-2140/aa64f7
Oyedele, A. A. (2019). Use of remote sensing and GIS techniques for groundwater exploration in the basement complex terrain of Ado Ekiti, SW Nigeria. Applied Water Science, 9, 51-63. https://doi.org/10.1007/s13201-019-0917-9 DOI: https://doi.org/10.1007/s13201-019-0917-9
Oyeyemi, K. D., & Olofinnade, O. M. (2016). Geoelectrical-Geotechnical Studies for Near Surface Characterization, Case History: Lagos, SW Nigeria. Electronic Journal of Geotechnical Engineering, 21(10), 3735-3750.
Ugwu, G. Z., & Ezema, P. O. (2013). 2D electrical resistivity imaging for the investigation of the subsurface structures at the proposed site for Kauridan Estate at Ibagwa-Nike, Southeastern Nigeria. International Journal of Scientific Research in Knowledge, 1, 528-535. https://doi.org/10.12983/ijsrk-2013-p528-535 DOI: https://doi.org/10.12983/ijsrk-2013-p528-535
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