Assessment of Subsurface Competency Using Geotechnical Method of a Proposed Structure F.C.T Nigeria

Structural failure has been recently happenings mostly in the commercially populated states along coastal line Nigeria. As a result, an open field at chosen location Abuja, Nigeria, was investigated. For purpose of this study, test bores were drilled and Standard Penetration Tests (SPT) conducted every 1.5 m interval up to maximum depth 12.0 with bearing pressure ranging between 20 kN/m2 1000 . 3 bores’ within plot location, samples obtained locations for laboratory analysis. Findings revealed that subsurface lithology found site explored depths 0.0 ~ is silty sand, laterite, sandy clay, clayey weathered rock. The findings from sub-soils different places their pressures computed SPT N value. Building foun dations may be rigid raft foundations 2.0 meters below present ground level, according capacity values range 60 3.0 meters. recommended building take into account sub-soil’s characteristics drilling 1.0 structure might also supported by frictional piles buried 10 beneath surface.