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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)


Article Title: Subsoil Evaluation for Pre-foundation Study using Geophysical and Geotechnical Approach
by Akintorinwa, O. J and Abiola O.

A research approach that integrated geophysical and geotechnical methods for subsoil evaluation using for pre-foundation study was carried out in this research paper. The study involved eighteen Vertical Electrical Sounding (VES) using Schlumberger configuration and geotechnical investigation. Three major geoelectric layers were delineated; the topsoil, weathered layer and basement bedrock. The layer resistivity and thickness ranges are 137 - 1559 ohm-m; 189 - 441 ohm-m and 1253- ? ohm-m and 0.3 - 2.3 m and 0.9 - 5.4 m for the three layers respectively. The estimated depths to basement bedrock vary from 0.5 - 5.9 m, for most parts of the property, the overburden thickness are generally less than 2.0 m. There are no indications of the major geologic structure such as faults. The percentage passing 0.075mm ranges from 30 - 32%, the plastic index ranges from 16 - 20% and the linear shrinkage ranges from 7 - 8%. The subsoil on or within which civil structures can be founded in the area are composed of mainly clayey sand and laterite with resistivity values generally greater than 250 ohm-m and all the geotechnical parameters fall within specification for subsoil foundation materials. It can be concluded therefore that the subsoil within the study area are generally competent and buried metallic structures within the area are at extremely low risk of being corroded
Keywords: layer resistivity, geoelectric, geotechnical, subsoil, bedrock
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ISSN: 2141-7016

Editor in Chief.

Prof. Gui Yun Tian
Professor of Sensor Technologies
School of Electrical, Electronic and Computer Engineering
University of Newcastle
United Kingdom



Copyright © Journal of Emerging Trends in Engineering and Applied Sciences 2010