Geoengineering site characterization for foundation integrity assessment
Kehinde D. Oyeyemi, O. M. Olofinnade, A. P. Aizebeokhai, Oluseun Adetola Sanuade, Michael A. Oladunjoye, A. N. Ede, T. A. Adagunodo, W.A. Ayara
Abstract
Inefficient near-surface characterizations prior to building construction have largely contributed to the incessant building failures in the form of structural defects and building collapses recently occurring in southern parts of Nigeria. Combined geophysical and geotechnical investigations have been used to select suitable foundation type and depth at a building construction site in part of the Lagos Island, Nigeria. Three geoelectrical resistivity survey profiles of length 150 m each were conducted using minimum and maximum electrode spacing of 5.0 m \nand 45.0 m, respectively. Boring, in-situ geomaterials samplings, cone penetrating \ntests, standard penetrometer tests and laboratory tests were among the geotechnical investigations carried out in accordance with the British standard code of \npractice. The geoelectrical resistivity imaging results provide the lateral and spatial \nspread of the geoelectrical units stratification within the study area, their clay and \nwater contents. The results of the laboratory and geotechnical tests also reveal \nthe subsoils lithologic units, their compressibility and shear strengths. A deeper piletype foundation on a more competent stable subsoil stratum at the depth greater \nthan 13 m is recommended for the proposed buildings in the study area so as to \neffectively transmit their loads. \nvulnerable to malaria. It is imperative that a vaccine should be produced and rolled out for use, especially during \nthe time of the COVID-19 pandemic when attention is given to mitigating the impact of the pandemic on public \nhealth. The malaria vaccine will reduce the number of hospital admission for malaria illness among children and \nother age groups. Africa will need to build strong innovations to overcome country-specific challenges in \nvaccination drive, human resources, and supply chain management. Accelerating education, sensitization, \ndiagnosis, and eradication through joint efforts of the government, healthcare professionals and general population will help to prevent the dual synchronous epidemic of COVID-19 and Malaria in Africa.