Integrated magnetic and electrical resistivity investigation for assessment of the causes of road pavement failure along
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REVIEW ARTICLE
Integrated magnetic and electrical resistivity investigation for assessment of the causes of road pavement failure along the Ife‑Osogbo Highway, Southwestern Nigeria Ayomiposi Henry Falade1 · Oluwaseyi Emmanuel Olajuyigbe1 · Ademakinwa George Oni1 · Hammed Opeyemi Falola1 · Adedotun Patrick Ige1 · Eunice Oluwakemi Ogundipe1 Received: 1 June 2020 / Accepted: 5 September 2020 © Springer Nature Switzerland AG 2020
Abstract This study combined magnetic and electrical resistivity investigations to assess the reasons for the persistent failure of road pavement along the Ife-Osogbo highway, southwestern Nigeria. Three traverses, each covering both stable and failed road segments, were established for ground magnetic, 2D dipole–dipole electrical resistivity imaging (ERI) and 1D Schlumberger vertical electrical sounding (VES) surveys. Data correction involving diurnal effect and offset were carried out on the magnetic data and the corrected data were presented as profiles and then modeled for 2D subsurface images. The VES and 2D ERI data were respectively modeled for layer geoelectric parameters and 2D resistivity images. The magnetic profiles and 2D magnetic subsurface models identified geologic structures (fault/fracture/contact zones) that are inimical to road pavement foundation beneath the investigated traverses. Subsurface sequences underlying the road segments are topsoil, lateritic layer, weathered layer, partly weathered/fractured basement and the fresh basement rock. Laterite, typical of competent subgrade for road pavement foundation, was generally observed beneath the stable segments while clayey weathered layer characterized the failed segments. From 2D resistivity images (upper 5 m), low resistivities ( ρ2
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