Foundation Improvement in Coastal Swamp Lands for Housing Construction: The Nigerian Case

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Author(s) Abam, T.K.S | Osadebe, C.C. | Sani R.O
Pages 494-500
Volume 3
Issue 9
Date September, 2014
Keywords Foundation, swamp lands, housing, construction

Increased industrial activities and the resultant population explosion in major Coastal Cities of the world, such as Amsterdam, London, and locally in Nigeria particularly Lagos, Port Harcourt, Bonny, Okrika, Brass and Warri and the consequent demand for increased residential space, have forced State and Federal Governments to undertake large scale housing development. However, the coastal lands comprising mainly swampy soils can hardly be used in their present condition without ground improvement. The methods of ground improvement have been by excavation and replacement of unsuitable foundation soils, empoldering and reclamation using hydraulic filing with fine to coarse sand. Case histories illustrating the procedures, concerns for quality control and environment are discussed in this paper. The choice of replacement material is dependent upon availability, local weather at time of construction and the load to be supported by the foundation. The minimum sand-fill thickness required to eliminate 97% consolidation settlement of underlying compressible soils in the case of sand filling are computed using graphs developed from Terzaghiís one-dimensional consolidation theory.

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