scholarly journals Engineering properties of residual soils in part of Southwestern Nigeria: implication for road foundation

2019 ◽  
Vol 1 (5) ◽  
Author(s):  
Olabode Olabanji Olofinyo ◽  
Oluwaseun Franklin Olabode ◽  
Imoleayo Oluwatoyin Fatoyinbo
Keyword(s):  
Engineering Properties ◽  
Residual Soils ◽  
Southwestern Nigeria

scholarly journals Engineering properties of concrete made from gravels obtained in Southwestern Nigeria

2017 ◽  
Vol 4 (1) ◽  
pp. 1295793 ◽  
Author(s):  
Nurain Sulymon ◽  
Olatokunbo Ofuyatan ◽  
Olowofoyeku Adeoye ◽  
Simon Olawale ◽  
Ayobami Busari ◽  
...  
Keyword(s):  
Engineering Properties ◽  
Southwestern Nigeria

scholarly journals Mineralogical and Geochemical Trends in the Residual Soils above Basement Rocks in Ore Area, Southwestern Nigeria

2017 ◽  
Vol 9 (3) ◽  
pp. 42
Author(s):  
Adewole John Adeola ◽  
Emmanuel Tamunobelema Tubonemi
Keyword(s):  
Inductively Coupled Plasma ◽  
Soil Layer ◽  
Clay Mineralogy ◽  
Lateritic Soil ◽  
Residual Soils ◽  
Southwestern Nigeria ◽  
Thin Sections ◽  
Tropical Regions ◽  
Basement Rocks ◽  
Parent Rocks

Residual clays and laterite of economic values often occur within weathering profiles above basement rocks in tropical regions due to supergene enrichment and leaching of liable components. Previous studies in Ore area mainly on geochemistry of the basement rocks with scanty information on the weathered profiles. This study was carried out to determine the compositional characteristics of the basement rocks, the geochemical trends within the profiles above the parent rocks and the evaluation of their economic potentials.Petrographic study was carried out on thin sections of the rock samples. Elemental compositions of the rocks, clay, laterite, and top-soil were determined using Inductively Coupled Plasma-Mass Spectrometer (ICP-MS). Clay mineralogy was determined using X-ray Diffraction (XRD) analysis. Chemical index of Alterations (CIA) was calculated from geochemical data.Weathering of granite and banded gneiss in Ore resulted in the formation of soil layer, which ranged 0-0.5m, laterite 1.2-3m and clayey zone 2.9-3.0m. Quartz, plagioclase feldspars, microcline, biotite and hornblende were the essential minerals in the parent rocks. Granite and banded gneiss is high SiO2 (>65%) but low in MgO (<2.0%) and CaO (<4.0%). Kaolinite (60-80%), goethite (3-12%) and microcline (4-10%) were the dominant minerals in the XRD of the weathering profiles. Traces of illite were present only in granite. The CIA was generally > 85 indicating advanced state of weathering producing lateritic soil. The lateritic profiles over granite and banded gneiss of Ore area varied with the composition of the parent rocks. The clay layer has economic potential for ceramics, fertilizer and structural wares.

Index, engineering properties and classification of tropical residual soils

2004 ◽  
pp. 37-55 ◽  
Author(s):  
Suhaimi Jamaludin ◽  
Bujang Huat ◽  
Shukri Maail
Keyword(s):  
Engineering Properties ◽  
Residual Soils

Indices for scaling and predicting weathering-induced changes in rock properties

2002 ◽  
Vol 8 (2) ◽  
pp. 121-135 ◽  
Author(s):  
Adnan Aydin ◽  
Nurdan S. Duzgoren-Aydin
Keyword(s):  
Statistical Evaluation ◽  
Point Of View ◽  
Engineering Properties ◽  
Rock Properties ◽  
Variable Properties ◽  
Residual Soils ◽  
Common Goal ◽  
The Common ◽  
Induced Changes ◽  
Physical And Chemical

Abstract This paper presents a critical review of microfabric, physical and chemical indices for scaling and predicting weathering-induced changes in rock properties. The common goal of these indices is mainly to condense complexities to numbers that can be plotted against each other and against engineering properties or weathering grades to determine if trends exist. However, a purely statistical evaluation to establish smooth trends in such highly variable properties is deceptive. No single index is valid or remains unaffected over the whole spectrum of weathered states. Combination of indices aimed at determining grade boundaries may also be misleading unless accompanied by detailed descriptions of microfabric and mineralogical observations. The presented index classifications highlight the nature and scope of indices and provide guidance for compatible and complementary combinations. The meaning and adequacy of criteria used in classifications of residual soils and weathered rocks are reexamined from the point of view of the fundamental differences inherent in their microfabric.

Geological and soil engineering properties of shallow landslides occurring in the Kutupalong Rohingya Camp in Cox’s Bazar, Bangladesh

Landslides ◽  
2022 ◽  
Author(s):  
A. S. M. Maksud Kamal ◽  
Farhad Hossain ◽  
Md. Zillur Rahman ◽  
Bayes Ahmed ◽  
Peter Sammonds
Keyword(s):  
Shear Strength ◽  
Bulk Density ◽  
Mineralogical Composition ◽  
Fine Sand ◽  
Liquid Limit ◽  
Engineering Properties ◽  
Anthropogenic Factors ◽  
Residual Soil ◽  
Geological Condition ◽  
Residual Soils

AbstractThe Forcibly Displaced Myanmar Nationals (FDMN), historically known as ‘Rohingya’ who fled the 2017 ethnic atrocities and genocide in the Northern Rakhine State of Myanmar, took shelter in Cox’s Bazar District of Bangladesh. The camp network, known as Kutupalong Rohingya Camp (KRC), is situated in the tectonically active tertiary hilly terrain. The KRC has been experiencing hydrometeorological hazards, where landslides are frequent. This study investigated the slopes’ geological condition, engineering properties and human interventions, which influence the landslides. The exposed slopes were relatively high (> 10 m) and steep ranging from 40° to 60° that have numerous polygonal tension cracks and fissures. From the geological and geotechnical aspects, there are three successive units of slope materials: (1) residual soils of sandy silt with clay, (2) highly weathered silty sandstones and (3) shale/clay with silt and fine sand intercalations at the bottom of the slopes. Field observations revealed that most slope failures occurred in the residual soil and weathered silty sandstone units. The residual soils have a bulk density of 1.49–1.97 g/cm3, a liquid limit of 25–48%, a plasticity index of 5–16% and an undrained shear strength of 23–46 kPa. The silty sandstones have a bulk density of 1.44–1.94 g/cm3, an internal friction angle of 34°–40° and a cohesion of 0.5–13 kPa. The mineralogical composition determined by the X-ray diffraction shows low clay mineral content, which does not affect landslides. However, the slope geometry, low shear strength with strain softening properties and torrential rainfall accompanied by anthropogenic factors cause numerous landslides every year. This study will help take proper mitigation and preparedness measures for slope protection in the KRC area and surroundings.

scholarly journals Geochemical, Index, and Strength Appraisals of Granite-derived Residual Soils

2020 ◽  
pp. 1-10
Author(s):  
C. O. Ikubuwaje ◽  
O. O. Oso ◽  
I. A. Rotimi
Keyword(s):  
Soil Profile ◽  
Research Work ◽  
Strength Properties ◽  
Strength Analysis ◽  
Residual Soils ◽  
Southwestern Nigeria ◽  
Engineering Construction ◽  
Geochemical Index ◽  
Sanitary Landfills ◽  
Geochemical Method

This research work examined the geochemical, index, and strength properties of lateritic residual soils from granitic parent rock in Akure, southwestern Nigeria. The aim is to underscore the potential use of such soils as engineering fills materials. The geochemical method involved the use of X-Ray Fluorescence (XRF). The major oxides determined from this analysis were used for the geochemical quantifications of the soils. Analysis of soil index properties involved consistency limits, grain size distribution and specific gravity tests, while the strength analysis involved compaction and unconfined compressive strength (UCS) tests. Results obtained from the index analysis classified the soil profile into behavioral groups VII and VI. These indicates that the soils are of high to intermediate plasticity and compressibility. The UCS values vary from 272.6 to 377.2 kPa while the shear strength values range from 138.8 to 188.6kPa, indicating good bearing capacity. The geochemical results revealed iron-oxide variations as the major influential constituent within the soil profile. Furthermore, the more lateriterizad zones correspond with the more competent horizons. The residual soils from the study area are found to be suitable materials in engineering construction works as Sanitary landfills and Subgrade materials.

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