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28. APPLICATION OF TWO DIMENSIONAL ELECTRICAL RESISTIVITY IMAGING (ERI) TECHNIQUES TO SITE INVESTIGATION AT OTOFURE, SOUTHERN NIGERIA by Ighodalo J.E. and Avwenaghegha O.J.Volume 50 (March, 2019 Issue)
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APPLICATION OF TWO DIMENSIONAL ELECTRICAL RESISTIVITY IMAGING (ERI) TECHNIQUES TO SITE INVESTIGATION AT OTOFURE, SOUTHERN NIGERIA


Ighodalo J.E. and Avwenaghegha O.J.


Department of Physics, University of Benin, Benin-City Nigeria.

Department of Physics, Delta State College of Education, Mosogar

  

Abstract


Geophysical investigations involving the use of 2D electrical resistivity imaging (ERI) techniques have been carried out at Otofure Southern Nigeria to study the nature of the subsurface structure to assess its suitability for the construction of the possible presence of faults, fractures, voids and clay that may pose a danger to the structures that are to be constructed. Six (06) high-resolution 2D electrical resistivity images were acquired using the Wenner configuration with minimum electrode and profile separations of 5m and dipole  dipole configuration with a minimum electrode spacing of 2.5m The roll-along technique was employed to cover all the profile length. The 2D Inverse Model resistivity section from 4 of the profiles showed that the area was suitable for construction purpose. However, 2 of the surveyed profiles showed possible accumulation of Clay sediment which could pose danger to heavy construction due to clays ability to fail under high pressure. 


Keywords: D, Electrical Resistivity, Imaging, Otofure, Clay

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