Non-Invasive Geophysical Investigation of Failure Along a Section of Ago-Iwoye Market Road, Ago-Iwoye, Southwestern Nigeria

A detailed geophysical investigation was carried out to determine if the subsurface geology is responsible for failures along this road section. This study aims image and identify competent, moderately incompetent zones of soil thus find failure section road. Electrical Resistivity Imaging (ERI) using Wenner array 2D Imaging, Vertical Sounding (VES) Schlumberger were adopted survey. The geoelectric from VES revealed presence 3 lithological layers; topsoil, weathered layer (clay, sandy clay, clayey sand), basement, which also true electrical resistivity images by imaging. results showed that shallow beneath mostly underlain with clay geotechnically not suitable construction. causes are believed be result topsoil seen in profiles, expand when absorbing water shrink drying, causing instability pavement due low shear strength high compressibility, fractured basement rocks at depths. Keywords: Basement; Clay; Resistivity; Road failure, Subsurface; Topsoil.