Engineering Subsoil Exploration for Foundation Design and Planning of a proposed Filling Station in Ore Area of Ondo State

O.O. Falowo¹ , M.P. Otuaga²

Section:Research Paper, Product Type: Journal-Paper
Vol.7 , Issue.2 , pp.77-87, Jun-2020

Online published on Jun 30, 2020

Copyright © O.O. Falowo, M.P. Otuaga . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
The study presents the usefulness of preconstruction engineering site investigation in the vicinity of proposed site for petroleum filing station in Ore, southwestern Nigeria using geoelectrical and geotechnical methods. The electrical resistivity utilized schlumberger configuration, and was complemented with in-situ geotechnical test and laboratory analysis of eleven soil samples at depths not exceeding 3.0 m. The results show that the topsoil resistivity (avg. 351ohm-m) is moderately competent/corrosive to sustain the structural load with appreciable thickness of 3.1 ? 15.5 m for shallow foundation. The thickness of the weathered layer is characterized by thickness greater than 10 m in all places within the site and is mildly/slightly corrosive, hence, favours burial of storage fuel tanks. The settlement analysis for foundation width of 0.6 ? 3.0 m at three depth levels of 1 m, 2 m and 3 m produced values between 9.46 ? 47.98 mm. But foundation width above 0.6 m is recommended so as to have settlement value less than 25 mm. The calculation of bearing capacities for strip and square foundation within 0.6 ? 1.4 m depth gives an allowable bearing capacity varying from 523 ? 806 kPa and 719 - 1063 kPa respectively. An average allowable bearing capacity of 150 kPa is recommended and would be appropriate for design of shallow foundation in the site, at a depth not less than 1.0 m. Therefore the proposed architectural plan for the station is professionally acceptable

Key-Words / Index Term :
Bearing capacity, Foundation structure, Settlement analysis, Electrical resistivity, Cone penetration test, Square and strip footing

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