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Author

G Akpokodje Enuvie

Bio: G Akpokodje Enuvie is an academic researcher. The author has contributed to research in topics: Subsoil & Borehole. The author has an hindex of 1, co-authored 1 publications receiving 17 citations.
Topics: Subsoil, Borehole

Papers
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01 Jan 2014
TL;DR: In this article, the authors used integrated surface electrical resistivity survey, borehole drilling and insitu testing by CPT to determine engineering geological properties of soils underlying Warri metropolis for the planning and design of civil engineering structures.
Abstract: Integrated surface electrical resistivity survey, borehole drilling and insitu testing by CPT were used to determine engineering geological properties of soils underlying Warri metropolis for the planning and design of civil engineering structures. Results revealed that three major sub-soil types underlie the area characterized by dry, swampy and marshy ground conditions. These soils occur in the dry plains and swampy areas, from top to bottom, as silty sand, clayey sand and sand. However in the marshy NPA area, only two soil layers occur: the top 6m thick organic clay layer overlying the sand layer. The geotechnical properties suggest that all the layers can support structural loads from civil structures, provided foundation design is preceded by adequate subsoil investigation to provide construction specific data.

19 citations


Cited by
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Journal Article
TL;DR: Different geotechnical properties of soils such as specific gravity, density index, consistency limits, particle size analysis, compaction, consolidation, permeability and shear strength and their interactions and applications for the purpose of civil engineering structures have been discussed as discussed by the authors.
Abstract: The occurrence and distribution of soils in nature varies from location to location. The type of soil depends on the rock type, its mineral constituents and the climatic regime of the area. Soils are used as construction materials or the civil engineering structures are founded in or on the surface of the earth. Geotechnical properties of soils influence the stability of civil engineering structures. Most of the geotechnical properties of soils influence to each other. In this paper, different geotechnical properties of soils such as specific gravity, density index, consistency limits, particle size analysis, compaction, consolidation, permeability and shear strength and their interactions and applications for the purpose of civil engineering structures have been discussed.

58 citations

Journal ArticleDOI
TL;DR: In this article, three (3) geotechnical boreholes were drilled at Akenfa in Yenagoa, Bayelsa Local Government Area of Nigeria and the results showed that the samples are low to medium plasticity silty clay.
Abstract: This study aims at establishing the sub-soil types and profile to ascertain the geotechnical characteristics of the underlying soils in Akenfa in Yenagoa, Yenagoa Local Government Area of Bayelsa State, Nigeria and recommend appropriate foundation design and construction of projects in the area. Three (3) geotechnical boreholes were drilled at the site to obtain baseline data on geotechnical properties of the soil and water level monitoring, the boreholes were advanced with the use of a cable percussion boring rig and were terminated to a maximum depth of 30m. The particle size distributions of a number of representative samples of the cohesionless soils were determined by sieve analysis. The results show that the samples are low to medium plasticity silty clay. The lithology revealed intercalations of clay and sand in thin layers to a depth of 2.0 m below the existing ground level. Underlying this clay is a stratum of loose to medium dense sand and dense sand. The sand is well sorted grading from fine to medium as the borehole advances. The laboratory analysis showed that the silty clay has undrained shear strength of 48 kPa. The loose sand has a maximum SPT (N) value of 12 while the medium dense sand has maximum SPT (N) value of 28. Considering the nature of the civil structures to be sited in the area, it is anticipated the load and the moderate compressibility of this near surface silty clay and the underlying loose silty sand be supported by means of raft foundation founded within the clay layer. It is recommended that studies on the geotechnical characteristics of the area be carried out as it provides valuable data that can be used for foundation design and other forms of construction for civil engineering structures in order to minimize adverse effects and prevention of post construction problems.

15 citations

Journal ArticleDOI
TL;DR: In this article, the authors used 3D seismic data and well information to assess the basin's potential for carbon capture and storage (CCS) in the Niger Delta region, showing that the presence of excellent reservoir-seal pair, very large basin size, suitable reservoir depth, matured oil and gas fields, moderate faulting intensity, availability of giant hydrocarbon fields and being a passive margin generally makes the Niger delta basin excellent environment for CCS.

8 citations

DOI
25 Dec 2018
TL;DR: In this paper, a pre-construction site investigation was carried out in a marshy stream channel and adjoining areas for a proposed building site to characterize the subsurface subgrades and recommend foundation design for which proposed structures include a 1-floor 39.7m x 33.6m hostel, a 20.5m x 10.0m 4-bedroom duplex and a 1 -floor 2-bedroom block of flats measuring 28.2m x 11.5 m with 1.5tons mechanical cone penetrometer.
Abstract: A pre-construction site investigation was carried out in a marshy stream channel and adjoining areas for a proposed building site to characterize the subsurface subgrades and recommend foundation design for which proposed structures include a 1-floor 39.7m x 33.7m hostel, a 20.5m x 10.0m 4-bedroom duplex and a 1- floor 2-bedroom block of flats measuring 28.2m x 11.5m with 1.5 factored design dead + live load data as 2700tons, 655tons and 1270 tons respectively. Field investigations include boring of 10 boreholes to a depth of 10m using auger and sounding of 6 cone penetration tests using a 2.5tons mechanical cone penetrometer. The results indicate a soft clay layer existing from ground surface to a depth varying from 1.0m – 1.1m in the stream channel and 0.60m – 0.70m on the adjoining land. These clays are extra-sensitive to sensitive high compressibility Kaolin clays (CH – OH, MH - OH) with undrained shear strength varying from 42 – 75.0KN/m2, angle of internal friction ranging from 0 - 30 with cone resistance values of 3.0 – 11.0 Kg/cm2. Swell potential ranges from 11.45 – 30.64%, swell index from 0.44 – 0.57, activity from 7.0 – 11.0 and swelling pressure 4.776KPa – 4.890KPa. Below this depth a harder clay layer occurs to a depth of between 4.5m – 5.2m and is proposed to found the structures. Pre-consolidation pressures determined from Oedometer test on undisturbed clay samples retrieved from the centre of the second clay layer varies from 125.0KPa – 162.5KPa and Overconsolidation ratios from 2.75 – 6.40 depicting overconsolidation while water table corrected bearing capacities indicates a favourable fully compensated depth of 1.2m for the building foundations. However excessive total settlement determined using Boussinesq’s average vertical stress ranges from 180.1cm - 211.1cm on adjoining land and 160 -111.9cm on the stream channel under the worst case scenario for the structures necessitating further depth compensation to 2.0m. This yielded a reduction in settlement varying from 8.0% to 9.9% on the stream channel and 16.7% - 18.4% on the adjoining land. Rate of settlement depicts that it will take 6.655 and 28.65 years after construction to achieve 50% and 90% settlement under the worst case scenario. Below these clays are loose to medium density sands of varying grain sizes. Load transfer to these sands through pile foundations was considered using the cone penetrometer as a load test to derive unit toe bearing capacities of piles which embedment depth of 11.0m was recommended.

6 citations

01 Jan 2014
TL;DR: In this paper, the sub-soil types and profile of the underlying soils in a site in D/Line, Port Harcourt, Nigeria for appropriate foundation design considerations for infrastructural development purposes in the area.
Abstract: The study aims at characterizing the sub-soil types and profile to ascertain the geotechnical properties of the underlying soils in a site in D/Line, Port Harcourt, Nigeria for appropriate foundation design considerations for infrastructural development purposes in the area. Borings were accomplished using a percussion rig with the aid of augers. Representative samples were analyzed in the laboratory in accordance with relevant geotechnical engineering standards. The study revealed that the surface is underlain by a soft – firm sandy clay (about 6m ) of moderate-high compressibility with undrained Strength of 46KN/m 2 overlying a firm-stiff sandy layer. Beneath these layers, are loose sandy layers (with an angle of friction, of 29 o ) overlying a medium dense sandy layer (with an angle of friction of 31 o ). Underlying these layers is a dense sandy layer (with an angle of friction of 36 o ). The allowable bearing capacity profile of the sub-surface shows low bearing capacities characteristics (1m - 2m: <110KN/m 2 ). These values are relatively lower than the projected foundation loading. Pile driven to at least 5m into the sand layer is recommended as the foundation option for consideration for civil engineering structures in the study area.

5 citations