Geophysical Investigation of Bulding Distress in Gashua, Nigeria
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Abstract
Gashua is the Headquarter of Bade local government in Yobe State, it has a population of about 125, 000 according to the 2006 population census. It is a densely populated town located in a flood plain within the Chad Basin. In an attempt to proffer solutions to the prevailing building distress in Gashua and its environs, this study was carried out to accurately characterize the subsurface geology of the area, thereby reducing the incidence of building failure in the area to minimum. In this study, electrical resistivity method was used to determine the causes of building distress and failure in Gashua and its environs. Vertical Electrical Sounding (VES) using Schlumberger array and Electrical Resistivity Tomography (ERT) were adopted for the study. The results of the VES survey showed that the area is composed of five geologic layers which are; the topsoil, clay, sand, sandy-clay, and sand. The ERT results showed that most of the building foundations in the study area were laid within the second layer which is a clay formation. The findings of this study showed that the building distress and failure which are common in the study area were caused by the volumetric changes of the clay formation due to hydrological dynamics. The clay formation absorbs water during the raining season and swells up, and during the dry season it shrinks, this changes in the volume of the clay formation underlying the building foundation in the study area induces a significant mechanical stress on the buildings leading to the formation of cracks, voids, fissures and fracturing of the buildings, which eventually culminate into collapse. In this study, electrical resistivity method of geophysical investigation has demonstrated to be a veritable tool for geotechnical soil evaluation. Based on the findings of this study, geophysical investigation of a proposed site...
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Adebowale, P.A., Gambo, M.D., Ankeli, I.A. & Daniel, J.D. (2016). Building Collapse in Nigeria: Issues and Challenge, International Journal of Arts and Sciences. 9(1), pp.99-108.
Adepelumi A.A. and Olorunfemi M.O., (2000), ‘Engineering Geological and Geophysical Investigation of the Reclaimed Lekki Peninsula, Lagos, South western Nigeria’, Bulletin of Engineering Geology and the Environment, 58, pp. 125-132.
Adepelumi A.A., Olorunfemi M.O., Falebita D.E. and Bayowa O.G., (2009), ‘Structural Mapping of Coastal Plain Sands using Engineering Geophysical Technique: Lagos Nigeria Case Study’, Natural Science, Vol.12-9.
Aderoju, A. A., & Adebayo, O. O. (2017). Geophysical investigation for foundation studies at Ogudu river valley estate, Lagos, south western Nigeria. The Pacific Journal of Science and Technology. 16(1), pp. 295-304.
Agada, L.E., Malgwi, D.I., and Abbas, B.K. (2011). Harmattan Dust and Its Effects in Semi-Arid Zone of Nigeria. A Case Study of Maiduguri Metropolis and Its Environs. Techno-Science Africana Journal, 6, pp. 19-25.
Akintorinwa, O.J., and Abiola, O. (2011). Subsoil evaluation for pre-foundation study using geophysical and geotechnical approach. Journal of Emerging Trends in Engineering and Applied Sciences. 2(5), 858-863.
Fatoba, J. O., Salami, B. M., & Adesida, A. (2013). Structural failure investigation using Electrical resistivity method: A case study of Amafor Ihuokpala, Enugu, southeastern Nigeria. Journal of Geology and Mining Research. 5(8), pp. 208- 215.
Feld, T. (2005) Geotechnical Analysis Requirements. Paper presented at the Copenhagen Offshore Wind Conference 2005, Copenhagen, Denmark, October 26–28
Ibitoye F.P., (2013), ‘Application of Geophysical Methods to Building Foundation Studies’, International Journal of Geosciences, vol. 4, pp. 1256-1266.
Makinde, V., Alagbe, S.A., Coker, J.O. & Bello, A.M.A. (2010). Determination of borehole sites for extensive irrigation work in Yobe State, Nigeria. Journal of American Science, 6(2), 58-61.
Matheis, G. (1976). Short review of the Geology of the Chad Basin in Nigeria. In C.A. Kogbe (ED.) Geology of Nigeria, Lagos: Elizabeth publishing company.
Omenihu, F.C., Onundi, L.O., and Alkali, M.A. (2016). “An analysis of building collapse in Nigeria (1971-2016): challenges for stakeholders”. University of Maiduguri Annals of Borno. 26, 113-114.
Oteze, G.E., & Fayose, E.A. (1988). Regional developments in hydrogeology of the Chad Water Resources, Journal of Nigerian Association of Hydrogeology, 1(1), pp. 9-29.
Ozegin, K. O., Oseghale, A., Okolie, E. C. & Ujuanbi, O. (2011). Integration of very low-frequency electromagnetic (VLF-EM) and electrical resistivity methods in mapping Sub-surface geologic structures favorable to road failures”, Int’l Jour. of Water Res. and Environ. Eng. 3(6): 126-131.
Salami, B.M., Falebita, D.E., Fatoba, J.O., Ajala, M.O. (2012). Integrated Geophysical and Geotechnical Investigation of A Bridge Site – A Case Study of A Swamp/Creek Environment in Southeast Lagos, Nigeria. Ife J. Sci. 14(1):75-82.