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Pre-design Site Investigation for an Oil and Gas Facility in the Marginal Lands of the Nigerian Niger Delta Sub-region

  • So-ngo Clifford TemeEmail author
Conference paper
Part of the Sustainable Civil Infrastructures book series (SUCI)

Abstract

A pre-design site investigation for Oil and Gas Storage Tanks to be located at a project site between Latitudes N04° 4732.2 to N04° 4749.5 and Longitudes E006° 55 35.9 to E006° 56 35.9 within the Marginal Lands of the Niger Delta sub-region has been carried out for an Oil & Gas Company in Nigeria. A total of fourteen (14) 152.4 mm diameter, 40 m deep borings, using the Percussion Drill Rig were carried out along the shoreline of the site. Eight (8) of the borings were situated along the shoreline at high tide while the remaining six (6) borings were situated 20.00 m offshore. The lithology along the coastline consisted of an uppermost dark-greyish Organic Clay layer (OH) [7–10 m thick]; underlain by greyish Silty-Sands (SM) [3–5 m thick]. These are further underlain by Clayey Silts (ML) [2.00–4.50 m thick], Clayey Sands (SC) [3–10 m thick] and Well-graded Sands and gravels (SW) at the bottom of the borings [>40 m thick]. The borings off-shore had similar lithologies but with preponderance of Sands and Gravels at the lower depths of the borings. While the upper dark organic clays (OH) have friction angles (ϕ) ranging from 0°–6° and cohesion intercepts (Cu) from 14.50 kPa to 28.0 kPa, the Silty-Sands (SM) and well-graded Sands and gravels (SW) at depths of between 30 m–40 m have friction angles (ϕ) ranging from 10°–36° and cohesion intercepts (Cu) of 0.00 kPa. The average Standard Penetration Test (SPT) N-values of the Sands (SP) and Gravel layers (SW) at depths varied from 15 to >50 with corresponding Bearing Capacity values (based on Factor-of Safety [FS = 3.0]) of 100.00–478.50 kPa, indicating high to very high values. A proposed Quay wall to protect the project site is to be constructed with reinforced concrete tubular steel piles. These are to be embedded at depths of between 30.00 to 40.00 m with computed average Total Pile Loads [(Qb + Qs)] = qult varying from 323.25 MN to 1044.50 MN, [where: Qb = total Pile base load and Qs = Pile Skin friction]. Work on this project has since commenced to about 60% completion at the time of preparing this paper.

Keywords

Oil and gas storage tanks Quay wall Marginal lands SPT N-values Bearing capacity and pile load tests 

Notes

Acknowledgements

The authors are sincerely very grateful to the Managing Director of our Clients - Stopgap Fuels Nigeria Limited – for permission to use the data for the preparation of this paper.

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Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  1. 1.Institute of Geosciences and Space Technology (IGST)Rivers State University of Science and TechnologyPort HarcourtNigeria
  2. 2.Department of GeologyRivers State University of Science and TechnologyPort HarcourtNigeria

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