Delineation of the Geotechnical Parameters Within the Kaduna Refining and Petrochemical Corporation Layout

Abstract

Direct Current Resistivity investigation for engineering studies was carried out around the Kaduna Refining and Petrochemical Corporation Industrial Layout within the Basement Complex of Central Nigeria. The study aimed at evaluating the competence of the near surface formation meant to aid in foundation design and other related engineering structures, and to unravel the subsurface profile which in turn determines if there would be any subsurface geotechnical parameters and lithological variation(s) that might lead to structures failure within the site. A total of twenty-two (22) VES statins were established. The data obtained were subjected to 1-D inversion algorithm to determine the layer parameters. The geo-electric section revealed three to five lithological units defined by the lateritic topsoil, silty/sandy/clayey, the weathered basement as well as the fresh basement. The resistivities and thicknesses of the topsoil range from 100 Ωm – 2668 Ωm and 0.3 m – 6.4 m respectively. The last layer considered as the fresh basement and in some cases the fractured basement has an infinite thickness with resistivity ranging from 610 Ωm – 79674 Ωm and the established average overburden thickness of the study area was found to be 23 m. A broad portion of the area was found to be competent for civil works except at VES stations C6 and D4 with relatively low topsoil resistivity. The competent regions have been recommended for major construction works such as high rise buildings, bridges and roads.