Geophysical Investigation was carried out along Ugbogbo road, Secretariat area in Igarra, Edo Sta... more Geophysical Investigation was carried out along Ugbogbo road, Secretariat area in Igarra, Edo State Nigeria. In this area, the self potential method, electrical resistivity method of both the horizontal profiling technique and the vertical electrical sounding were adopted to determine possible causes of road failures which are basically geological, and recommend solutions to this problem. A total number of 10 Vertical Electrical Soundings were carried out. The geo-electric interpretation and the inverted 2-D resistivity structures of the wenner-schlumberger technique revealed three subsurface layers: the topsoil, weathered layer and the presumed fresh bedrock. The topsoil resistivity ranges from 32 to 936 ohm-m and with an average thickness of 2.2 m. The topsoil is underlained by the fractured layer of apparent resistivity of 11.3 to 67 ohm-m and average thickness of 20 m. Along the transverse, some part of the topsoil (10 m,115 m) especially at the area where the stream was flowing underneath across the road (at 190 m) are suspected to be either clayey sand or water saturated. This study reveals that transverse is not really fit for road construction and some excavation and filling should be done before road construction.
Geophysical Investigation was carried out along Ugbogbo road, Secretariat area in Igarra, Edo Sta... more Geophysical Investigation was carried out along Ugbogbo road, Secretariat area in Igarra, Edo State Nigeria. In this area, the self potential method, electrical resistivity method of both the horizontal profiling technique and the vertical electrical sounding were adopted to determine possible causes of road failures which are basically geological, and recommend solutions to this problem. A total number of 10 Vertical Electrical Soundings were carried out. The geo-electric interpretation and the inverted 2-D resistivity structures of the wenner-schlumberger technique revealed three subsurface layers: the topsoil, weathered layer and the presumed fresh bedrock. The topsoil resistivity ranges from 32 to 936 ohm-m and with an average thickness of 2.2 m. The topsoil is underlained by the fractured layer of apparent resistivity of 11.3 to 67 ohm-m and average thickness of 20 m. Along the transverse, some part of the topsoil (10 m,115 m) especially at the area where the stream was flowing underneath across the road (at 190 m) are suspected to be either clayey sand or water saturated. This study reveals that transverse is not really fit for road construction and some excavation and filling should be done before road construction.
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A total number of 10 Vertical Electrical Soundings were carried out. The geo-electric interpretation and the inverted 2-D resistivity structures of the wenner-schlumberger technique revealed three subsurface layers: the topsoil, weathered layer and the presumed fresh bedrock. The topsoil resistivity ranges from 32 to 936 ohm-m and with an average thickness of 2.2 m. The topsoil is underlained by the fractured layer of apparent resistivity of 11.3 to 67 ohm-m and average thickness of 20 m. Along the transverse, some part of the topsoil (10 m,115 m) especially at the area where the stream was flowing underneath across the road (at 190 m) are suspected to be either clayey sand or water saturated. This study reveals that transverse is not really fit for road construction and some excavation and filling should be done before road construction.
A total number of 10 Vertical Electrical Soundings were carried out. The geo-electric interpretation and the inverted 2-D resistivity structures of the wenner-schlumberger technique revealed three subsurface layers: the topsoil, weathered layer and the presumed fresh bedrock. The topsoil resistivity ranges from 32 to 936 ohm-m and with an average thickness of 2.2 m. The topsoil is underlained by the fractured layer of apparent resistivity of 11.3 to 67 ohm-m and average thickness of 20 m. Along the transverse, some part of the topsoil (10 m,115 m) especially at the area where the stream was flowing underneath across the road (at 190 m) are suspected to be either clayey sand or water saturated. This study reveals that transverse is not really fit for road construction and some excavation and filling should be done before road construction.