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ABSTRACT
2-Dimensional Electrical Resistivity Imaging (ERI) has been employed for detailed characterizations and classification of the subsurface for preconstruction studies at 3 different locations in Yenogoa area of Bayelsa State, Nigeria.
A total of 10 ERI profile lines where surveyed. The Wenner-Schlumberger electrode configuration was employed in the study, due to its effectiveness in both vertical and horizontal resolution using PASI Earth resistivity meter at three different locations in the study area. The data where then collated and inverted using RES2DINV software.
The results show that the study area consist majorly of silt sand at the top which stretches up to about 13m in depth with resistivity ranging from 1Ωm to about 80Ωm. From 13.5m up to 27m consists sand mixed with clay sediment and laterite and sandstones stretching up to 45m in depth. The lithological classification of sands in the study area show that there is an even distribution of low resisitivity sand deposits across the entire profiles in Location 1 and 3. However, the results of the profiles from location 2 reveal that the sands are unevenly distributed. This study provides a useful guide to the site engineers in designing appropriate foundation structure.
