Geoelectrical Investigation of Soils as Foundation Materials in Umudike Area, Southeastern Nigeria

Nwokoma, Esomchi; Chukwu, Godwill U.; Amos-Uhegbu, C.

doi:10.9734/psij/2015/14667

Cited by 1 publication

(1 citation statement)

References 13 publications

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“…However, geological factors are rarely considered as one of the factors responsible for such failures even though these roads are built on the soil. This shows that road construction requires adequate knowledge of the conditions of subsurface [6]. The non-consideration of geologic factors has led to many road and highway failures in the country.…”

Section: Introductionmentioning

confidence: 99%

Preliminary geophysical investigation for road construction using integrated methods

Amosun

Olayanju

Sanuade

et al. 2018

Materials and Geoenvironment

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Integrated geophysical methods have been used to investigate the competency of the subsoil. The geophysical surveys conducted involve very low-frequency electromagnetic (VLF-EM) and electrical resistivity (ER) methods (dipole-dipole). ABEM Wadi and Ohmega resistivity meter were used to acquire VLF-EM and ER data, respectively, along two traverses. Station interval of 5 m was used for the VLF-EM survey, while inter-electrode spacing for dipole–dipole was 10 m; the inter-dipole expansion factor (n) ranged from 1 to 5. KHFFILT software was used to generate VLF-EM profiles and pseudosection, while DIPRO software was used for ER. Results from the ER method revealed the pattern of resistivity variations within the study area. The low resistivity values (11–25 Ohm-m) observed at the southern part of the study area could be attributed to changes in clay contents and degree of weathering in the subsurface. The results from the VLF-EM investigation revealed the presence of near-surface linear geologic structures of varying lengths, depths and attitudes, which suggest probable conductive zones that are inimical to the foundation of the road subgrade.

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Section: Introductionmentioning

confidence: 99%