Geophysical Investigation of Building Foundation in Part of Ilorin, North Central Nigeria Using Electrical Resistivity Method
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Date
2019-10-21
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IOP
Abstract
Electrical resistivity method has been performed using Vertical
Electrical Sounding (VES) technique at a Bishop Smith Memorial College,
Ilorin, Kwara State to examine the geophysical parameters that can be used to
evaluate the subsurface competency. Eight VES stations were sounded, using
Schlumberger configuration for data acquisition with current electrode
spacing varying from 1.0 to 140.0 m. The VES data obtained were interpreted
using ipi2win+ip Software. The field data acquired was presented as
geoelectric sounding curves and geoelectric section. The interpretation of the
field results revealed heterogeneous subsurface geologic sequence probed to
34.6 m and beyond. It also showed presence of near surface linear geologic
structures of varying lengths, depths and attitude which suggest the
competent zones for foundation laying. The major subsurface layers are the
top soil which consists of interlocking and concretional lateritic stones and
clayey sand, weathered basement, fractured basement and fresh basement.
For building development in the study area, the topsoil must be excavated to
at least the Fresh basement (competent layer) to avoid building deformation.