Geotechnical and mineralogical evaluation of some lateritic soils from Southwestern Nigeria
Electronic Journal of Geotechnical Engineering
Department of Geology and Mineral Sciences, University of Ilorin, Ilorin, Kwara State, Nigeria
Four lateritic soil samples derived from different parent rocks were examined for their suitability as construction materials. All analyses were carried out in accordance with BSI standard. Results showed that soil samples from migmatite gneiss, quartz schist and amphibolites are siltysands while the granite derived soil is siltyclay. All samples have low to intermediate plasticity. The cohesion values of the soils are between 50kPa and 80kPa at standard Proctor compaction energy while it is between 30kPa and 75kPa at modified Proctor compaction energy. Also, the angle of internal friction varies from 11° to 24° and from 14° to 24° for standard and modified compaction energies respectively. The coefficients of permeability of the soils fall between 10-8m/s and 10-9m/s making them practically impermeable. The mineralogy of the soil showed that they contain no undesirable mineral constituent as they contain mainly quartz. The results of the compaction and CBR showed that the samples are suitable for use as subgrade and fill materials. The grain size distribution values, Atterberg limits and coefficient of permeability of the soils make them suitable for use as liners in waste disposal systems. The angle of internal friction and cohesion of the soils means the soils could also support shallow foundations and could also support moderately steep slopes. This geotechnical information is important for foundation design for future development of the sampled localities. © 2013, EJGE.
Adhesion; Compaction; Friction; Grain size and shape; Internal friction; Mineralogy; Minerals; Particle size; Particle size analysis; Quartz; Soil surveys; Structural design; Waste disposal; Angle of internal friction; Coefficient of permeability; Geotechnical information; Geotechnical properties; Grain size distribution; Southwestern nigeria; Standard Proctor compaction; Waste disposal systems; Soils; compaction; geotechnical engineering; geotechnical property; laterite; mineralogy; particle size; permeability; Nigeria