Engineering geological mapping in terrains of tropical weathering — an example from abuja, nigeria

Malomo, S.; Olorunniwo, M.A.; Ogunsanwo, Olufemi

doi:10.1016/0013-7952(83)90031-5

Cited by 12 publications

(9 citation statements)

References 7 publications

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“…This RQD value is categorized as very poor. This criterion, in which the depth of weathering is typically controlled by joint or fractures of rock, is agreed with by Malomo et al [11]. This problematic zone is more likely to be subjected to earthquake effects than a non-contact zone.…”

Section: Contact Zonesupporting

confidence: 53%

Indicative microzonation map of the contact zone between the kenny hill and limestone formation using active, passive and hybrid MASW methods

Zaki,

Ghazaly,

Bawadi

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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The impact of the far-field earthquake generated by the Sumatra-Andaman earthquake (Richter scale of 9.3) was also felt by Malaysians. The ground motion triggered by this earthquake is caused by the shear wave velocity (Vs), particularly at a depth of 30 m (Vs30). Therefore, this dynamic soil properties need to be determined, which was evaluated using the active, passive, and hybrid multichannel analysis of surface waves (MASW) methods at 16 locations in the contact zone between the Kenny Hill and limestone formations in Kuala Lumpur, Malaysia. The Vs determined from the MASW for the contact zone ranging from 198 m/s to 286 m/s at the ground surface and from 376 m/s to 662 m/s at 30 m depth. In contrast, in the non-contact zone, Vs range from 212 m/s to 328 m/s at the ground surface and from 562 m/s to 921 m/s at 30 m depth. For Vs30, the contact zone has a minimum value of 280 m/s and a maximum value of 380 m/s, while the non-contact zone has a minimum value of 370 m/s and a maximum value of 530 m/s.

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Section: Contact Zonesupporting

confidence: 53%

Indicative microzonation map of the contact zone between the kenny hill and limestone formation using active, passive and hybrid MASW methods

Zaki,

Ghazaly,

Bawadi

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…The nature and characteristics of the subsurface conditions can be ascertained with the use of a thorough site study. The lithology was used as a preliminary basis for rock type (top soil layer, weathered layer, and fractured basement) identification, in the (FCT) [12] , Malomo et al [13] , Omeje et al [14] and the lithology of the study area agree with the earlier study mention. Sedimentary rocks and the Basement Complex make up the majority of Abuja's subsurface geology.…”

Section: Introductionmentioning

confidence: 64%

Assessment of Subsurface Competency Using Geotechnical Method of a Proposed Structure F.C.T Nigeria

Wasiu

Buduwara

Isaac

et al. 2022

adv. in geol. and geotech. eng. res.

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Structural failure has been recently happenings mostly in the commercially populated states along the coastal line in Nigeria. As a result, an open field at a chosen location in Abuja, Nigeria, was investigated. For the purpose of this study, test bores were drilled and Standard Penetration Tests (SPT) were conducted at every 1.5 m interval up to a maximum depth of 12.0 m with the bearing pressure ranging between 20 kN/m2 and 1000 kN/m2 . 3 test bores’ were drilled within the plot location, and samples were obtained at the test bores locations for laboratory analysis. Findings revealed that subsurface lithology found at the site within the explored depths of 0.0 ~ 12.0 m is mostly silty sand, laterite, sandy clay, silty clay, clayey sand, and weathered rock. The findings from the sub-soils of the different places and their bearing pressures were computed with SPT N value. Building foun dations may be rigid raft foundations at a depth of 2.0 meters below the present ground level, according to bearing capacity values that range from 20 kN/m2 to 60 kN/m2 at 1.5 to 3.0 meters. The recommended building foundations take into account the sub-soil’s characteristics at the drilling places at a depth of between 1.0 and 3.0 meters. The structure might also be supported by frictional piles buried 10 meters beneath the surface.

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“…The residual soils of Abuja can be divided into two major groups; the residual soil which is lateritic and a product of the intense weathering of the parent rocks and the transported soil formed by the physical movements of the soil particles. The residual soils are formed in most parts of the area except along river valleys and at the foot and summit of slopes (Malomo et al 1983).…”

Section: The Study Areamentioning

confidence: 99%

3-dimensional surface magnetic susceptibility distributions with depth to investigate anthropogenic pollutants boundary in Abuja Metropolis

Jatto

Süle²,

Ahmed³

2016

geol

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Changes in the magnetic susceptibility of topsoil, especially in urban areas, are greatly affected by the deposition of anthropogenic metallic dust arising from industrial activities, the burning of fossil fuels, car wear, and tyre abrasion. In this study, magnetic susceptibility measurements were carried out in vertical soil profiles of 30.0 cm depth from the surface at 10.0 cm intervals in about 431 locations within the Abuja metropolis with a view to investigate the penetration ability of magnetic pollutants in the ground. From the obtained data, 3-D surface contour maps were plotted for different depths. The results show a magnetic susceptibility decrease from the surface down the ground to the depth of 30.0cm; most of the recorded susceptibilities were of an anthropogenic origin rather than pedogenic activities. This indicates that the anthropogenic dust depositions are mostly a surface phenomenon and may therefore not pose a risk to groundwater aquifers and near surface wells.

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Engineering geological mapping in terrains of tropical weathering — an example from abuja, nigeria

Cited by 12 publications

References 7 publications

Indicative microzonation map of the contact zone between the kenny hill and limestone formation using active, passive and hybrid MASW methods

Indicative microzonation map of the contact zone between the kenny hill and limestone formation using active, passive and hybrid MASW methods

Assessment of Subsurface Competency Using Geotechnical Method of a Proposed Structure F.C.T Nigeria

3-dimensional surface magnetic susceptibility distributions with depth to investigate anthropogenic pollutants boundary in Abuja Metropolis

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