%0 Journal Article
%T Electrical resistivity imaging survey for shallow site investigation at University of Ibadan campus, south-western Nigeria
%A Oluwafemi Omowumi
%J Journal of Engineering and Applied Sciences
%D 2012
%I Asian Research Publishing Network (ARPN)
%X A geo-electrical imaging survey was conducted at Abadina area of University of Ibadan, Ibadan, Southwestern Nigeria for shallow site investigation in order to determine the applicability of 2-D resistivity imaging in studying the weathered profile, which in turn determines how feasible the area would be in terms of erection of structures that will stand the test of time. The area is underlain mainly by augen gneiss with minor intrusion of dolerite dyke. Geophysical survey was carried out using 2-D electrical resistivity imaging technique. The Wenner array was employed. Field data were obtained for eight electrical imaging lines. The field data was subjected to inversion in order to remove geometrical effects from the pseudosection and produce an image of true depth and true formation resistivity. This layer has a range of resistivity from 10 to 100 Ohm-m. Partially weathered basement were observed on some of the traverses with relatively high resistivity anomalies. The image lines depict clearly that the subsurface material differs in terms of their competence. This is reflected in the weathering pattern where part of the image line was showing deeply weathered material towards one side whereas the other side is showing very shallow overburden at less than 2 m. In conclusion, site investigation using 2-D electrical resistivity imaging is an essential step to be taken before the erection of any structure for minimum damage because a balanced interaction of soil and structure is the hall-mark of a successful design of foundation. Further studies such as soil test should be carried out to ascertain the suitability of the soil for future planning of the site.
%K electrical imaging
%K site investigation
%K wenner array
%K clay layer
%K competent rock
%K Ibadan.
%U http://www.arpnjournals.com/jeas/research_papers/rp_2012/jeas_0212_638.pdf