VIABILITY TEST OF UNIVERSITY OF ILORIN DAM EMBANKMENT USING ELECTROMAGNETIC TECHNIQUE
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Date
2017
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School of Pure and Applied Sciences Modibbo Adama University of Technology, Yola
Abstract
Very Low Frequency electromagnetic (VLF) technique with an inter-data spacing of 5 and 10 m was employed to establish five traverses around the dam embankment using ABEM WADI VLF model GSM-19Vto determine the fracture system, detect the water-bearing fractured zones in order to infer the possibility of seepage that could lead to the dam failure. The dam, underlain by the Nigerian basement rocks, is bounded within the coordinates 4° 39'52"EX4° 40' 0"E and 8° 27'5"N X8° 28'5"N. The data were interpreted using Fraser and Karous-Hjelt filter techniques. The results revealed the locations of the water-bearing fracture zones, 2D form the mode of emplacement of the subsurface causative structures, and the depth to the conductive bodies. The 2D models show that most of the water-bearing fractured zones found along traverses 1, 2, and 3 are at a depth of about 5 m to 40 m. The most prominent water-bearing fracture zones located at 80-125 m and 130-150 m from the starting point of traverse 1 could signify seepage around the embankment. Notable water-bearing fractures along traverse 2 are at 80-100 m, 150 m, 210-240 m, and 300-320 m. Traverse 3 shows only one at 75-150 m. The presence of water-bearing fractured zones beneath the embankment could lead to failure and collapse. Other minor conductive bodies were detected along all five traverses.
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Keywords
Very Low Frequency, Dam, Traverse, Water-bearing fracture, Seepage, Research Subject Categories::NATURAL SCIENCES