Odita, Wilson and Okeke, Pius O. and Iyioku, Magnus Ugochukwu (2023) GEOPHYSICAL STUDY OF ROAD FAILURES USING VERTICAL ELECTRICAL SOUNDING OF SOME ROADS IN ENUGU, ENUGU STATE, NIGERIA. International Research Journal of Applied Sciences, Engineering and Technology, 9 (3). pp. 21-39. ISSN 1573-1405
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Abstract
Road failures in Nigeria have been attributed to so many factors such as lack of proper geophysical investigation prior to road construction and a proper understanding of the weathered layer characteristics. The thickness of the road layer was determined using Vertical Electrical Sounding (VES) or Vertical Electrical Drilling (VED) data collected from ten (10) VES stations along the Enugu-Onitsha Expressway, Thinker's Corner Enugu, and Port Harcourt Enugu expressways. The survey was conducted with the ABEM SAS 1000 Terrameter with half current electrode spacing of 50m, and the data was processed with computer software to obtain modeled curves and the thickness of the layers. The study's findings revealed that the first layer's thickness ranged between 0.6 m and 2.3 m with an average thickness of 1.6m along the ten VES locations, and the apparent resistivity of the first layer ranged between 46.2 Ωm and 1265.7 Ωm with an average resistivity value of 302 Ωm along the ten VES locations. These showed low resistivity of the first layer, indicating clay/shale and low bearing capacity. It is therefore recommended that if soil and clay are the main top materials that usually contain water, they must be removed and replaced with more competent materials.
| Item Type: | Article |
|---|---|
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Natural and Applied Sciences |
| Depositing User: | Uchenna Eneogwe |
| Date Deposited: | 27 May 2025 10:01 |
| Last Modified: | 27 May 2025 10:01 |
| URI: | http://eprints.gouni.edu.ng/id/eprint/4652 |
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