CBR and shear strengths of compacted laterite soils from southwestern Nigeria

Ogunsanwo, Olufemi

doi:10.1144/gsl.qjeg.1989.022.04.05

Cited by 15 publications

(4 citation statements)

References 6 publications

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“…He obtained high crushing strength values for bricks made from the different varieties of clay and found them to be suitable for bricks and ceramics industries in view of their good quality. Durotoye et al (1988) and Ogunsawo (1989) also obtained similar results for the clay deposits in parts of south western Nigeria.…”

Section: Introductionsupporting

confidence: 54%

Suitability of Flood Plain Deposits for the Production of Burnt Bricks in Parts of Benue State, Central Nigeria

Tse¹

2012

GEO

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In Benue State, Central Nigeria, flood plain soil deposits along the banks of major rivers and seasonal streams are used as raw materials in the local manufacture of burnt bricks for the construction of houses. This work evaluates the compositional characteristics of the soils and engineering properties of derived bricks to assess their suitability and as alternatives to sandcrete as load bearing materials in the construction of houses. The soils are composed of varying proportions of sand, silt and clay. While the sand fraction is mainly fine to medium grained, the clays are of low plasticity. The chemistry of the soils show that the order of abundance of the major oxides is CaO

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Section: Introductionsupporting

confidence: 54%

Suitability of Flood Plain Deposits for the Production of Burnt Bricks in Parts of Benue State, Central Nigeria

Tse¹

2012

GEO

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“…The medium to low hydraulic conductivity values measured are comparable to those determined by other case studies in laterites around the world (e.g. McFarlane ; Sharma et al ., ; Ogunsanwo ; Ruprecht and Schofield ; Taylor and Howard ; Eilers et al ., ; Osazuwa and Chinedu ). For example, Ruprecht and Schofield () determined the upper horizons of a laterite soil in Western Australia to have hydraulic conductivity of around the order of 10 m/d, and underlying soil horizons approximately an order of magnitude less.…”

Section: Resultsmentioning

confidence: 99%

Evidence for extreme variations in the permeability of laterite from a detailed analysis of well behaviour in Nigeria

Bonsor

MacDonald

Davies

2013

Hydrological Processes

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Abstract:Laterite soils are widespread in tropical Africa and have a large impact on the hydrology of the areas they cover. The permeability of laterite helps determine the partitioning of runoff and interflow and regulates groundwater recharge to underlying bedrock. Groundwater within laterite also forms a widespread source of drinking water, typically from unimproved hang-dugwells. Despite its importance, there is little published information on laterite aquifer properties. In this study, data from a 6 m deep well in Nigeria have been analysed to characterise the hydraulic conductivity of the laterite from repeated pumping tests. Transmissivity measurements from 40 tests spread out across a hydrological year varied from 0.1 to 1000 m 2 /d. Further interpretation of the data demonstrate a strong non-linear decrease in horizontal hydraulic conductivity with depth, characterised by an upper horizon of extreme permeability (400 m/d), and a much lower permeability profile beneath (<0.1 m/d). These data are substantiated with observations from other wells throughout the area. This non-linear permeability structure has several implications: the upper laterite can facilitate rapid lateral throughflow in the wet season, enabling contaminants to be transported significant distances (up to 1 km); natural groundwater levels are restricted to a narrow range for much of the year; and, in the dry season, the lower permeability of the deeper laterite restricts the amount of water which can be abstracted from shallow wells, leading to well failure. The work highlights the need for a wider study to better understand laterite soils and the role they play in regional hydrology.

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“…A database was compiled by extracting data on lateritic soils from published literature (e.g Meireles, 1967;Ola, 1975Ola, , 1983Ogunsanwo, 1985aOgunsanwo, , 1985bOgunsanwo, , 1989aOgunsanwo, , 1989bOgunsanwo, , 1993 and laboratory tests. The data from published literature cover lateritic soils occurring within and outside Africa.…”

Section: Database and Statistical Analysismentioning

confidence: 99%

Comparative reliability evaluation of lateritic soils as hydraulic barriers

2005

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A numerical investigation to determine the existence or otherwise of congruence between laboratory-based and field-based models for predicting hydraulic conductivity of compacted clay liners has been conducted. The comparisons here are based on values of the reliability index estimated with the use of the two models for cases when hydraulic conductivity is assumed to be normally and lognormally distributed. The laboratory reduced Proctor and modified Proctor compactive efforts were assumed to correspond to the lowest and highest compactor weights (165 kN and 338 kN for sheepsfoot rollers only from literature) respectively. The standard Proctor compactive effort was assumed to correspond to the mean compactor weight of 261.4 kN. Reliability estimates from the laboratory-based model were consistently higher than the corresponding values from the field-based model for each of the variables common to the two models. As laboratory samples usually involve small samples which are often unrepresentative of field situations, it is considered that reliability levels estimated with the use of the field-based model provide more realistic assessment of compacted lateritic soils as hydraulic barriers. Compactor weight of 300 kN and above may be needed for effective compaction of lateritic soil liners. Reliability-based designs of lateritic soil liners should incorporate appropriate probability distribution types for variables in the field-based model.

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CBR and shear strengths of compacted laterite soils from southwestern Nigeria

Cited by 15 publications

References 6 publications

Suitability of Flood Plain Deposits for the Production of Burnt Bricks in Parts of Benue State, Central Nigeria

Suitability of Flood Plain Deposits for the Production of Burnt Bricks in Parts of Benue State, Central Nigeria

Evidence for extreme variations in the permeability of laterite from a detailed analysis of well behaviour in Nigeria

Comparative reliability evaluation of lateritic soils as hydraulic barriers

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