Geotechnical Properties of Soil Sequence for Foundation Design at Addo, Lagos, Nigeria

Oluyemi Emmanuel Faseki, Olusegun Ayobami Olatinpo, Akinsile Richard Oladimeji


Geotechnical characterization was undertaken in a proposed construction site along Badore Road, Addo, Lagos, Nigeria with the aim to unravelling the geo-stratigraphy and engineering properties of the shallow formations as foundation material. Two boreholes were drilled upto the depth of 30.0m while Cone Penetration Tests were deployed upto depth of 6.0m. Samples from boreholes were subjected to grain size and Atterberrg Limits tests. The results revealed that the site is underlain essentially by soft silty sandy clay at the upper layer (0.0 – 5.0m) characterized by void ratio of 0.80 – 0.84, unit weight of 17.50 – 19.0KN/m3, friction angle of 6 – 80, natural water content of 22 – 30% and average SPT-N of 2 which is indicative of poor foundation material. The middle layer is  firm to stiff silty sandy clay (5.0 – 17.0m) with void ratio of 0.84 – 0.86, cohesion values of 30 – 32KN/m2, unit weight of 19.0 – 20.50KN/m3, friction angle of 8 – 100 and average SPT-N value of 8 typifying low foundation material. These layers are further underlain by medium dense silty sand (17.0 – 30.0) with void ratio of 0.43 – 0.46, unit weight of 20.0 – 21.0KN/m3, friction angle of 32 -330 and SPT-N value of 23 which is the most competent as foundation materials. The preponderance of soil with poor engineering properties at the shallow foundation zones (0.0 – 3.0m) precludes the adoption of shallow foundation in the area. Pile installed to competent layer at 20.0m within the dense silty sandy layer is recommended as foundation option for consideration for the proposed structure.

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