Influence Of Geology On Pavement Performance: A Case Study Of Shagamu-Benin City Road, Southwestern Nigeria

Abam, T. K. S.; Osadebe, CC; Omange, GN

doi:10.4314/gjgs.v3i1.18706

Cited by 13 publications

(11 citation statements)

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“…This is similar to the swelling behaviour of expansive shales from the middle region of Saudi Arabia which causes severe and widespread damage in residential buildings, sidewalks and pavements due to the development of heave and swelling pressure in the expansive shales [19]. Also in south-western Nigeria underlain by basement rocks, pavement distress due to poor subgrade performance in addition to poor engineering construction has been reported [20][21][22][23]. This work is an attempt to determine critical factors in the pavement performance by correlating the mineralogical and the geotechnical index properties of soils developed over the underlying Imo Shale between Umuahia and Okigwe to the pervasive road failure in the section.…”

supporting

confidence: 68%

Geotechnical and Mineralogical Evaluation of Soils Underlying a Failed Highway Section in South Eastern Nigeria

Tse¹,

Efobo²

2016

JEASE

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Abstract:The Port Harcourt Enugu expressway is part of a national road grid that links parts of southern and northern Nigeria. The severe pavement failure between Umuahia and Okigwe section of the expressway covering a distance of about 30 km was investigated by geotechnical and mineralogical assessment of disturbed and undisturbed samples of the underlying soils. Also vertical electrical sounding was performed at the failed sections. Results indicate that the section is underlain by shales of the Imo Formation, and soils are composed of 27% and 74% sand and fines respectively. The Atterberg limit values are moderate to high, with liquid limit in the range of 49-54%, plasticity index 11.1-24.4% and linear shrinkage 17.86-23.57% respectively. Abrasion test results of 0.58 to 16% indicate shales of low durability. The 24 hour free swell tests results range from 33-70% implying soils of moderate to high hydro-affinity and volume change. These data corroborate the X-ray diffraction analyses results which show montmorillonite and kaolinite as the main clay minerals present in the soils. Undrained cohesion range from 9 to 54 kPa and frictional angle from 13° to 29°. High settlement amounts and field observation of intense failure correlated well with the engineering properties and the clay minerals. The soils indicate mainly MI-MH and A-7-5 soils on the USC and AASHTO classification system respectively, implying poor quality soils as subgrade materials. The engineering properties may be modified and upgraded by stabilisation. Result of the study will be useful in remedial works on the failed sections of the road and future pavement design in areas underlain by the shales.

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confidence: 68%

Geotechnical and Mineralogical Evaluation of Soils Underlying a Failed Highway Section in South Eastern Nigeria

Tse¹,

Efobo²

2016

JEASE

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“…Particularly the lack of detailed preliminary engineering has considerable implications for the certainty of project outturn costs-which is further amplified, as the diagnosis of problematic expansive soil types typical of the wetland condition of the Niger Delta, at the precontract phase is necessary if the project team are to address relevant risk and competently estimate costs. This raises the question of value for money to the client, as the project delivered may not necessarily be a standard one, logically linked to the rather robust body of literature centred on investigating the high incidence of premature road failure in the region (Abam, 2005;Aigbedion, 2007;Emujakporue, 2012).…”

Section: Discussion Of Findingmentioning

confidence: 99%

Putting context to numbers: a geotechnical risk trajectory to cost overrun extremism

Amadi

Higham

2018

Construction Management and Economics

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The study investigates the cause of the unusually high cost overruns experienced in highway project delivery in the tropical wetland setting of the Niger Delta region of Nigeria. This is in view of the extensive literature supporting the link between geology, the lack of geotechnical best practices and cost overruns. An empirical profiling of cost overrun research further reveals the predominance of mono-method studies based on survey methods, correlative analysis and archival data modelling techniques, all of which are underlain by positivism. The study argues that such positivist philosophies, although methodologically valid, cannot adequately explain and provide in-depth understanding of the contextual cost overrun drivers in highway organisations., Using a robust and thoughtfully designed mix of methods, the paper examines the contribution of geotechnical risks to cost overruns experienced in highway project, and demonstrates the relevance of context in cost overrun research. Cost overrun data from documentary sources for 61 completed highway projects in the Niger Delta are gathered and analysed, revealing an average value of 216%, with extreme cases, ranging up to 1925% of budgeted cost. To uncover the intrinsic contextual drivers, 16 interviews were conducted with participants from the three highway agencies in the region, responsible for the execution of the sampled highway projects. Adopting a geotechnical narrative, the data is thematically analysed, deductively and inductively. The results of the analysis identified that poor project governance, management and procurement practices, have inhibited the competent management of geotechnical risk, creating a propensity for extreme cost overruns on the highway projects. The study submits the phenomenon of cost overruns in public infrastructure projects is underlain by a complexity of contextual social constructs, which would have been overlooked in positivists studies. Cost overrun research therefore, needs to be contextually and numerically anchored.

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“…Furthermore the clays from the weathered rocks here have high expansive potential with plasticity index as high as 44% with a lowest value of 19%. Abam et al [19], in their study of influence of geology on pavement performance of the Shagamu -Benin highway also indicated that high groundwater table due to the presence of thin weathered soil lying on fresh basement rocks causes high water level and contributed to poor subgrade drainage thereby making pavement unstable. For the pavement under investigation, the soils on the lithologic types can be classified mostly as having low expansive potential, index as presented in Table 6.…”

Section: Groundwater and Soil Drainagementioning

confidence: 99%

Geotechnical Characterization of the Subgrade on Some Rural Roads in Cross River State, Nigeria and the Influence of Geology

Ilori

Anusa

2020

JERR

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The subgrades of three different rural roads alignment were investigated with the aim to determine their geotechnical properties. The three roads are on two different geologic terrains. Two of the roads, the 18 km Yahe-Waniye-Wanakom road and the 6 km Okpoma-Okuku road are on Cretaceous sediments terrain, while the 8 km Ugboro-Imaje-Okuku road is on the Basement Complex terrain. Based on American Association of Highways and Transportation Officials (AASHTO) most of the soils classify as A-2-4, A-2-6 on the first two roads with A-7-5, A-7-6 soils interspersed between the A-2-4 soils. The A-2-4, A-2-6 soils were also encountered on the only alignment on the basement complex, but the A-7 group of soils were not encountered on this alignment. Based on The Transport Research Laboratory Road Note 31, subgrade quality on all the three alignments is classed into ‘S4 to S6’ subgrade class. In this classification scheme ‘S6’ is the subgrade of the highest quality.

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Influence Of Geology On Pavement Performance: A Case Study Of Shagamu-Benin City Road, Southwestern Nigeria

Cited by 13 publications

References 0 publications

Geotechnical and Mineralogical Evaluation of Soils Underlying a Failed Highway Section in South Eastern Nigeria

Geotechnical and Mineralogical Evaluation of Soils Underlying a Failed Highway Section in South Eastern Nigeria

Putting context to numbers: a geotechnical risk trajectory to cost overrun extremism

Geotechnical Characterization of the Subgrade on Some Rural Roads in Cross River State, Nigeria and the Influence of Geology

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