By incorporating the techniques of electrical resistivity survey, subsurface geology of the study area was successfully characterized to predict likely causes of road failure. 2D resistivity imaging and Vertical Electrical Sounding (VES) surveys were integrated to investigate the causes of road failure at Olaboye Olaleye street, Iwaya Lagos, Nigeria. The study area lies within the sedimentary terrain of South-western Nigeria. The PASI resistivity meter was used for the acquisition of eleven (11) Vertical Electrical Sounding data using the schlumberger configuration and three (3) Constant Separation Traverses (CST) covering the entire area. The interpreted VES and 2D CST data were further processed using the Res2D and DIPROWIN softwares respectively, which gave an understanding of the vertical and lateral variations in resistivity. The recurrent road failure at Olaboye Olaleye Street, Iwaya Lagos state has led to a number of problems ranging from financial loss, environmental mortification and intense transportation issues. Erosion of the immediate environment has also occurred, therefore, determining the cause of this pavement failure is the sole focus of this study. From the results, a maximum of four (4) geodetic layers were delineated. The first geo-electric layer represents the top soil and is composed of clayey- sand to clay with resistivity values that range from 16Om to 80Om and thickness values that range from 0.8 m to 1.1 m. This layer is detrimental to road construction. The second geo-electric layer comprises sandy-clay to peat with resistivity values that range from 2.0 Om to 57.7 Om and thickness values that vary between 1.7 m to 11.5 m. The third layer is composed of peat to sand, with resistivity values that range from 1.14 Om to 355 Om and thicknesses that vary between 5.3 m to 21 m. The Fourth layer consists of Sandy-Clay to Sand with resistivity values that range from 57 Om to 195 Om and thickness values that vary between 5.3 m to 30.6 m. The Electrical Resistivity method has proven to be an effective method in determining the cause of road failure, as the composition of the soil in the area is a major contributor. Thus, for road construction to be carried out, the soil has to be excavated and sand filled.
Presentation Date: Monday, September 16, 2019
Session Start Time: 1:50 PM
Presentation Start Time: 3:55 PM
Location: 303B
Presentation Type: Oral
