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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/3475

Title: INTEGRATED GEOPHYSICAL AND DIRECT GEOTECHNICAL INVESTIGATIONS FOR BUILDING FOUNDATION AT ADDIS ABABA SCIENCE AND TECHNOLOGY UNIVERSITY, AKAKI, ADDIS ABABA, ETHIOPIA
Authors: Hailemariam, Siyum
Advisors: Tigistu Haile(Dr.)
Keywords: GEOPHYSICAL
AKAKI
Copyright: Jun-2011
Date Added: 24-Jul-2012
Publisher: Addis Ababa University
Abstract: A foundation study has been conducted on the construction site of the Addis Ababa Science and Technology University Campus. The site is located in the central Ethiopian highlands at the western margin of the Main Ethiopian Rift within the Akaki catchment, locally known as Kilinto. Geophysical techniques have been employed in the work to minimize the problems encountered in relation to the limited number of data points available to spatially describe site conditions; these being the primary factors affecting the accuracy and completeness of any site description. The study is aimed at evaluating the competence and suitability of near surface/shallow depth Earth layers as foundation materials. Geophysical and direct geotechnical methods of investigation were employed in which the electrical resistivity imaging, magnetic, and soils and rocks analysis techniques were respectively used. The geophysical results revealed that three distinct geoelectrical sequences whose geological interpretations correspond to a topsoil, weathered rock and bedrock. The topsoil is recent sediment deposits, which is composed of dark expansive clay, silty clay/ clayey silt, sandy silt and granular materials. The second layer is highly to completely weathered and fractured scoracious basalt and scoria. The geoelectrical section across the study area shows undulating nature of the bedrock morphology with depth of bedrock beginning from 4 to 20 m. From the combination of electrical imaging and the magnetic survey interpretations, there are evident signatures of fractures/faults within the bedrock which can affect the building foundations in the area. The geotechnical results show that the consistency limits of the soils within the area, have high to very high plasticity, hence, the soils are expected to exhibit high to very high swelling potential. Overall assessments, the subsoil on or within, where engineering structures will be founded, are not competent for heavy structures. Buildings should preferably be constructed in the southwestern, southern and western part of the study area particularly in the northwestern side of the profile-1and 3 and southeastern side of the Profile-1 where the sediment thicknesses are relatively shallow and with few weak zones.
Description: A THESIS SUBMITTED TO THE SCHOOL OF GRADUATE STUDIES OF ADDIS ABABA UNIVERSITY IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE IN GEOPHYSICS
URI: http://hdl.handle.net/123456789/3475
Appears in:Thesis - Earth Sciences

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