INVESTIGATIGATION OF FRESH BASEMENT TOPOGRAPHY USING GEO-ELECTRIC SOUNDING METHOD AT SARDAUNA MEMORIAL COLLEGE KADUNA, KADUNA STATE NORTH- WESTERN NIGERIA
Abstract
Geo-electric sounding method is mostly used for engineering studies. 25 sounding points along the five profiles was carried out at Sardauna Memorial College Kaduna. This is an attempt to investigate the basement topography of the area. The Ohmega resistivity meter was the principal instrument used. The Schlumberger Electrode configuration was used in the data collection. The method consist of expanding AB (distance between the current electrodes) while MN (distance between the potential electrodes) is kept fixed. The VES curves were interpreted using IPI2Win Resistivity computer software. The results of the interpreted VES data showed an irregular distribution of the basement layer, with resistivity values ranging from 1000Ωm to 83422Ωm. The basement layer is predominantly fresh Granite Rocks. The overburden thickness ranges from 2.8m to 63.8m with an average depth of 17.98m. Clay constituents are needed to be excavated at an average depth of 8m from the topsoil before laying any foundation.
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