Olayinka Lukman Adesina | Ahmadu Bello University, Zaria, Nigeria (original) (raw)

Uploads

Papers by Olayinka Lukman Adesina

Vertical electrical soundings (VES) and standard penetration test (SPT) were carried out at Ahmad... more Vertical electrical soundings (VES) and standard penetration test (SPT) were carried out at Ahmadu Bello University Phase II, Zaria, Nigeria, with the aim of correlating between transverse resistance (T) and number of blows per counts (N-value) for foundation studies. Two (2) SPT and VES using Schlumberger electrodes array, were conducted within the study area. The VES data acquired from the field were processed and interpreted using AGI earth imager 1D software. Borehole data of exact point, where the VES was carried out were used for calibration. The results obtained from the VES depicts that the depth to basement values ranges between 6.5 and 8.0 m which agree with the borehole data obtained from the SPT results. The results of resistivities and thickness obtained from the VES curve were used to compute transverse resistance. The transverse resistance was used to correlate with the N-values obtained from SPT data. It was observed that the correlation of transverse resistance and ...

Applied Journal of Physical Science, 2020

The recent failure of building foundations such as cracks, structural differential settlements an... more The recent failure of building foundations such as cracks, structural differential settlements and collapse has now become a great concern to geoscientists. A new site at Ahmadu Bello University, Nigeria, was investigated to explore the suitability of the subsurface material for the foundations of buildings, identify weak zones that may be prone to subsidence and the competence to support massive structures. This investigation was achieved with 3D electrical resistivity tomography (ERT). The data were obtained using Terrameter SAS 4000 and ES 464 electrode selector equipment and processed using the RES3DINV software. Dipole-dipole configuration at electrode spacing of 5 m was used to acquire the data along six profiles laid in the study area. The results in correlation with borehole data showed that the subsurface has a minimum of three geo-electric sections. It can be concluded that the competent layer with high resistivity values (746 to 1206 Ωm) is recommended for building or high rising building foundations due to its fresh basement rock. In the topsoil, clay formation should be avoided, this is because the clay materials are subject to differential settlement or flow under pressure.

Journal of Mining and Geology , 2020

The area under study lies in a transition environment of the Nupe Basin and the Southwestern Nige... more The area under study lies in a transition environment of the Nupe Basin and the Southwestern Nigerian Basement Complex, its bounded by latitudes 008 30′ N to 009 00′ N and longitude 005 00′ E to 005 30′ E. Aeromagnetic data were acquired from Nigeria Geological Survey Agency (NGSA) and ground magnetic data of four profiles with two each 2.5 km and other two 1 km each were acquired using Proton-Precession Magnetometer and Earth Magnetometer Model EM2 with the aim of studying mineralization of pegmatite. Qualitative analysis revealed major and minor subsurface geologic structures significantly trending NE-SW direction, believed to have caused mineralization of pegmatite. The high magnetic anomalies in the basement region of the study area are attributed to relatively deep-seated low relief basement structures with possible rare metals of columbite and tantalite while region with low magnetic susceptibility are attributed to present of sandstone, quartz, graphite, and feldspar. Different values of gradient and anomalies indicates the presence of numerous and different amplitudes, shapes and orientations. Trend of most structures are in conformity with fault lines in geological map. Quantitative analysis revealed depth to top of magnetic bodies as 10 m to 95 m for ground survey and 0 m to 1.62 km for aeromagnetic survey hence, they are near-surface causative with high promising mineralization.

Very Low-Frequency Electromagnetic (VLF carried out at the Ahmadu Bello University Phase II in or... more Very Low-Frequency Electromagnetic (VLF carried out at the Ahmadu Bello University Phase II in order to investigate the suitability of the soil materials for the foundation of super Plus equipment and ABEM SAS 4000 were used for VLF acquisition respectively. The VLF interval of 10 m along each profile. The data collected from each of the VLF were processed and interpreted with the aid of Karous Electrical resistivity profile was laid on the weak zones revealed by the 2D VLF profiles through the aid of dipole and interpreted with the aid of Res2Dinv software. Borehole log of the study area was used as additional information which serves as a calibration tool. The 2D imaging profile of VLF-EM highly correlates with resistivity profile. The 2D VL revealed the conductive zone and resistive zones. These zones are suspected to be geological features (dyke, faults and fractures). zones was filled with an earth's materials which are clay, and these materials are highly undesirable for the foundation of building structures due to its characteristics of swelling and contracting during rainy and dry season respectively.

Integrity Research Journals , 2019

FUDMA Journal of Sciences (FJS), 2019

Electrical resistivity tomography is a geophysical method that was used to characterize the soil ... more Electrical resistivity tomography is a geophysical method that was used to characterize the soil in Ahamdu Bello University Phase II, Zaria. Ahmadu Bello University site II lies between longitudes 7° 37.98' E and 7° 39.07' E and latitudes 11° 7.86' N and 11° 8.50' N. A multi-electrode resistivity meter (ABEM Terrameter SAS 4000) was used for data acquisition on the field using a dipole-dipole array and the data were processed and interpreted using RES2DINV. The results obtained from the resistivity tomograms of the three profiles were used to correlate with the borehole data and the correlation indicates four distinct layers (Topsoil, weathered basement, fractured and fresh basement). The most competent layer for building a foundation in the study area is the fresh basement which is about 15.9m deep from the earth surface. In this study, electrical resistivity tomography has been successfully used to determine the depth to basement and the extent to which the bedrock was delineated. Weak zones that may be prone to subsidence and the competent areas that can support massive engineering were identified.

FUDMA Journal of Sciences (FJS), 2019

Two-dimensional resistivity and induced polarization surveys have successfully been used to chara... more Two-dimensional resistivity and induced polarization surveys have successfully been used to characterize the
subsurface earth materials for groundwater exploration at Ahmadu Bello University Phase II, Zaria, Nigeria.
Two imaging profile lines were established, with each profile length of 200 m. The electrical resistivity and
induced polarization measurement on each profile lines were achieved using Wenner electrode array
configuration. The data obtained from the survey were processed and interpreted using Res2Dinv software.
The results of the 2D imaging profiles of resistivity and chargeability were calibrated using borehole data of
the study area. The profiles revealed two to three layers, which comprises of brownish lateritic sandy clay, light
brown clayey sand and greyish hard weathered rock. The possible location of fractured zones for groundwater
exploration was mapped out from the imaging profiles. The zones have the resistivity and chargeability value
of range between 0 – 62.8 Ωm and0.0001-0.167 ms respectively with a thickness of 9 m. Based on the results
obtained from this study, it shows that groundwater exploration is feasible in the study area and drilling for the
exploration of water should be targeted towards the fracture zone because it is hydro-geologically good in
basement complex rock. In general, resistivity and chargeability values alongside borehole data have been used
to provide better interpretation for groundwater exploration in the basement complex.

Electrical resistivity tomography is a geophysical method that was used to characterize the soil ... more Electrical resistivity tomography is a geophysical method that was used to characterize the soil in Ahamdu Bello University Phase II, Zaria. Ahmadu Bello University site II lies between longitudes 7° 37.98 ' E and 7° 39.07' E and latitudes 11° 7.86' N and 11° 8.50' N. A multi-electrode resistivity meter (ABEM Terrameter SAS 4000) was used for data acquisition on the field using a dipole-dipole array and the data were processed and interpreted using RES2DINV. The results obtained from the resistivity tomograms of the three profiles were used to correlate with the borehole data and the correlation indicates four distinct layers (Topsoil, weathered basement, fractured and fresh basement). The most competent layer for building a foundation in the study area is the fresh basement which is about 15.9m deep from the earth surface. In this study, electrical resistivity tomography has been successfully used to determine the depth to basement and the extent to which the bedrock was delineated. Weak zones that may be prone to subsidence and the competent areas that can support massive engineering were identified.

Two-dimensional resistivity and induced polarization surveys have successfully been used to chara... more Two-dimensional resistivity and induced polarization surveys have successfully been used to characterize the subsurface earth materials for groundwater exploration at Ahmadu Bello University Phase II, Zaria, Nigeria. Two imaging profile lines were established, with each profile length of 200 m. The electrical resistivity and induced polarization measurement on each profile lines were achieved using Wenner electrode array configuration. The data obtained from the survey were processed and interpreted using Res2Dinv software. The results of the 2D imaging profiles of resistivity and chargeability were calibrated using borehole data of the study area. The profiles revealed two to three layers, which comprises of brownish lateritic sandy clay, light brown clayey sand and greyish hard weathered rock. The possible location of fractured zones for groundwater exploration was mapped out from the imaging profiles. The zones have the resistivity and chargeability value of range between 0 -62.8 Ωm and0.0001-0.167 ms respectively with a thickness of 9 m. Based on the results obtained from this study, it shows that groundwater exploration is feasible in the study area and drilling for the exploration of water should be targeted towards the fracture zone because it is hydro-geologically good in basement complex rock. In general, resistivity and chargeability values alongside borehole data have been used to provide better interpretation for groundwater exploration in the basement complex.

Applied Journal of Physical Science, 2020

Journal of Mining and Geology , 2020

Integrity Research Journals , 2019

FUDMA Journal of Sciences (FJS), 2019

Electrical resistivity tomography is a geophysical method that was used to characterize the soil ... more Electrical resistivity tomography is a geophysical method that was used to characterize the soil in Ahamdu Bello University Phase II, Zaria. Ahmadu Bello University site II lies between longitudes 7° 37.98 ' E and 7° 39.07' E and latitudes 11° 7.86' N and 11° 8.50' N. A multi-electrode resistivity meter (ABEM Terrameter SAS 4000) was used for data acquisition on the field using a dipole-dipole array and the data were processed and interpreted using RES2DINV. The results obtained from the resistivity tomograms of the three profiles were used to correlate with the borehole data and the correlation indicates four distinct layers (Topsoil, weathered basement, fractured and fresh basement). The most competent layer for building a foundation in the study area is the fresh basement which is about 15.9m deep from the earth surface. In this study, electrical resistivity tomography has been successfully used to determine the depth to basement and the extent to which the bedrock was delineated. Weak zones that may be prone to subsidence and the competent areas that can support massive engineering were identified.

Two-dimensional resistivity and induced polarization surveys have successfully been used to chara... more Two-dimensional resistivity and induced polarization surveys have successfully been used to characterize the subsurface earth materials for groundwater exploration at Ahmadu Bello University Phase II, Zaria, Nigeria. Two imaging profile lines were established, with each profile length of 200 m. The electrical resistivity and induced polarization measurement on each profile lines were achieved using Wenner electrode array configuration. The data obtained from the survey were processed and interpreted using Res2Dinv software. The results of the 2D imaging profiles of resistivity and chargeability were calibrated using borehole data of the study area. The profiles revealed two to three layers, which comprises of brownish lateritic sandy clay, light brown clayey sand and greyish hard weathered rock. The possible location of fractured zones for groundwater exploration was mapped out from the imaging profiles. The zones have the resistivity and chargeability value of range between 0 -62.8 Ωm and0.0001-0.167 ms respectively with a thickness of 9 m. Based on the results obtained from this study, it shows that groundwater exploration is feasible in the study area and drilling for the exploration of water should be targeted towards the fracture zone because it is hydro-geologically good in basement complex rock. In general, resistivity and chargeability values alongside borehole data have been used to provide better interpretation for groundwater exploration in the basement complex.