GEOPHYSICAL AND GEOTECHNICAL CHARACTERIZATION OF A RECLAIMED LAND FOR CONSTRUCTION PURPOSES IN LAGOS NIGERIA(A CASE STUDY)

Adewoyin, O.O. and Joshua, E.O. and Akinyemi, M.L (2016) GEOPHYSICAL AND GEOTECHNICAL CHARACTERIZATION OF A RECLAIMED LAND FOR CONSTRUCTION PURPOSES IN LAGOS NIGERIA(A CASE STUDY). Journal of Scientific Research & Reports, 28 (2). pp. 1-6. ISSN 2320-0227

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Abstract

Near-surface seismic refraction and electrical resistivity methods were used to characterise the subsurface condition of a site reclaimed from water bodies in order to determine its competence for construction purposes. Nine seismic refraction profiles were acquired and the results were interpreted using SeisIma ger software. Also, twelve vertical electrical soundings were conducted and the acquired data were interpreted using WinResist computer package. Four-five geoelectric layers were delineated and the resistivity values obtained ranges between 23.3 and 1705.1 m  . The result of the resistivity method showed that the third layer is the most competent layer in the study area. The depth of this layer is between 7.5 m and 51 m in the subsurface. In a related development, three layers were delineated by the seismic refraction method and the third layer which is between 7 m and 18 m, may be the most competent because it had the highest engineering parameters. The Young modulus of the competent layer at this site ranges between 1.558 and 25.106 GPa and bulk modulus ranges from 0.999 to 16.093 GPa , it was also noted that the shear modulus ranges between 0.638 and 10.123 GPa . There is an agreement in the results of the two methods of investigation. Therefore, it was recommended that some form of arrangement must be made to transfer the load from the civil engineering construction to the most competent layer underneath so as to avoid building failure.

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