Geotechnical Investigation on Road Failure of Part of London Road Minna, Nigeria

Abstract

An electrical resistivity method involving Wenner technique was carried out at part of London Road Minna, Niger State. The aim of the study was to investigate the causes of road failure. Two profiles parallel to the road of the study area of 300 m in length were investigated using Wenner array electrical configuration method. The electrode spacing was at equal interval of 7.5 m and current was sent into the ground using both current electrodes while potential electrodes received the signal which is display by the terrameters in resistivity. A total of 42 electrodes were probed. The calculated apparent resistivity pseudo section of profile A shows low resistivity. At the distance between 205 - 250 m the material is of low resistivity which can also lead to failure of the road. Profile B shows some anomalies between the distances of 45-60 m which is likely to be clay.