Application of electromagnetic and electrical resistivity methods for foundation studies at Ahmadu Bello University Phase II, Zaria

Olayinka, L A; Aremu, B G; Ahmed, A L; Lawal, K. M.

doi:10.4314/bajopas.v12i1.10s

Cited by 2 publications

(3 citation statements)

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“…To do this, twenty vertical electrical soundings and twenty soil samples for geotechnical tests (CBR, Proctor, dry density, Atterberg limits, and granulometric analysis) were taken in the green belt and plutonic zones, which constitute the main geological units of the northern border of the Congo Craton, in order to determine by comparative analysis the formation process of these laterites [5].…”

Section: Discussionmentioning

confidence: 99%

“…At the same time, the mechanical properties of a soil give an account of the degree of alteration that led to its formation [3]. The comparative analysis of these parameters can inform on the quality of the mother rock and the process of alteration from geological units of different mineral compositions and ages, to decide globally on the mode of formation of a soil and the geological structure from which it comes [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Laterization Process Recognition along the Northern Border of the Congo Craton by Geoelectrical and Geotechnical Data

Nkoungou¹,

Tsala

Oyoa

et al. 2023

International Journal of Geophysics

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With the properties of laterites being related to the nature of the rock from which they are derived, twenty vertical electrical surveys and twenty boreholes for geotechnical tests, distributed in two units (plutonic and green belt zones) of the Ntem complex located at the northern limit of the Congo Craton, were implemented to study the formation process of the laterites of this geological structure. The inversion of the geoelectrical data in the plutonic area resulted in three lateritic layers with resistivities of 1090 Ω·m, 1302 Ω·m, and 1122 Ω·m, with induration and leaching indices of 28.9% and 72.56%. In the green belt zone, three lateritic layers were also identified with resistivities of 1080 Ω·m, 943 Ω·m, and 1158 Ω·m, with induration and leaching indices of 28.8% and 72.55%. The similarities of the geomechanical parameters (induration and lixiviation indices) show that these soils experienced similar weathering patterns during the same geological period, confirmed by CBR values, corresponding to PF3 platforms that can be used in road works. However, the average resistivity values in the different geological units (1171.77 Ω·m and 1061.16 Ω·m in plutonic and green belt areas) reflect the observed differences in resistivity values of the bedrock alterations (3413.51 Ω·m and 1569.32 Ω·m in plutonic and green belt areas), showing that these laterites are derived from different bedrock weathering. In addition, the average permeability values obtained in the plutonic zone ( k = 6.24 E − 05 cm/s) and in the green belt zone ( k = 5.82 E − 05 cm/s) confirm this difference. The reduction in the difference between the resistivities of the laterites compared to the difference observed in the bedrock of the two units highlights the leaching process over a long geological period.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laterization Process Recognition along the Northern Border of the Congo Craton by Geoelectrical and Geotechnical Data

Nkoungou¹,

Tsala

Oyoa

et al. 2023

International Journal of Geophysics

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“…The receiver of VLF tuned to the frequency of the transmitter of VLF which traversed across the surface of the Earth will displace high signals over a conductive fracture aquifer (water-bearing) zone [16,17,18,19]. Consequently, the signals from the transmitter stations are e ciently used to detect groundwater, mineral exploration, nuclear waste detection as well as soil engineering.…”

Section: Introductionmentioning

confidence: 99%

The Effectiveness of Very Low-Frequency Electromagnetics (VLF-EM) Method in Detecting Buried Targets at a Controlled Site

Alao,

Muyideen,

Dewu

et al. 2023

Preprint

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The ever-increasing anthropogenic activities that pose a significant threat to environmental security and sustainability have spurred Geophysicists to enhance geophysical techniques for shallow geophysical investigations, especially in identifying illegal buried materials. This article applied very low-frequency electromagnetic (VLF-EM) at a controlled geophysical site (CGS) where several targets were buried to examine the geophysical response for environmental and engineering simulation. The VLF-EM data obtained on the natural ground (without buried targets) and buried ground along the same profiles demonstrate the nature of the anomalies and the characteristic signals generated by the site's natural ground and after various buried targets are installed. There are clear and significant anomalies source-bodied between the natural and buried ground. The result shows no major high equivalent current density (conductive media) or low equivalent current density (non-conductive media) across the natural ground. Several minors and major conductive and non-conductive zones were encountered after the installations of the buried targets corresponding to conductive and non-conductive buried targets. Some anomalies become stronger over the large conductivity and non-conductive buried targets. A reasonable position of the buried targets was determined by the VLF-EM method with positive matches and few significant mismatches in the actual depths of buried targets. However, there are some unexpected emergencies, where some non-conductive buried target generates high equivalent current density values indicating conductive media, while some conductive buried target produces low equivalent current density values indicating non-conductive body, especially for large spacing. Major and minor characteristic VLF-EM anomalies were obtained across all the survey profiles. The VLF-EM method is more consistent at small spacing and it can be very useful for identifying underground metallic and non-metallic targets.

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Application of electromagnetic and electrical resistivity methods for foundation studies at Ahmadu Bello University Phase II, Zaria

Cited by 2 publications

References 0 publications

Laterization Process Recognition along the Northern Border of the Congo Craton by Geoelectrical and Geotechnical Data

Laterization Process Recognition along the Northern Border of the Congo Craton by Geoelectrical and Geotechnical Data

The Effectiveness of Very Low-Frequency Electromagnetics (VLF-EM) Method in Detecting Buried Targets at a Controlled Site

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