Investigation of Shear Strength and Index Properties of disturbed Soil in South-West Nigeria

Abstract: Sequel to limited data on soil properties in southwestern Nigeria hinders sustainable construction practices. This study addresses this gap by investigating the shear strength and index properties of soils in Ibadan, Oyo State. The research aimed to gain a deeper understanding of local soil behavior, focusing on shear strength and index properties. Soil samples were collected from four locations using core cutters and analyzed in the laboratory. Testing revealed that over 70% of the soil particles are fine-grained, passing a 0.075mm sieve. Shear strength varied significantly, ranging from 135 kN/m² to 285 kN/m² with an average of 243 kN/m². Index properties like liquid limit (23.57% - 43.57%), plastic limit (15.74% - 25.85%), and plasticity index (4.2% - 17.7%) also exhibited variations. Specific gravity ranged from 1.94g to 3.02g. Based on these results, the soil is classified as A-6 in the AASHTO system, indicating high clay content. The triaxial tests suggest relatively high cohesive strength. This comprehensive study provides valuable data on the shear strength and index properties of soils in Ibadan. This information will be instrumental for geotechnical and structural engineers when designing and planning construction projects in the region. Keywords: Shear strength, geotechnical properties, foundation, CBR, Atterberg limit. Title: Investigation of Shear Strength and Index Properties of disturbed Soil in South-West Nigeria Author: LongJohn, T. A International Journal of Engineering Research and Reviews ISSN 2348-697X (Online) Vol. 14, Issue 1, January 2026 - March 2026 Page No: 44-48 Research Publish Journals Website: www.researchpublish.com Published Date: 04-March-2026 DOI: https://doi.org/10.5281/zenodo.18865005 Paper Download Link (Source) https://www.researchpublish.com/papers/investigation-of-shear-strength-and-index-properties-of-disturbed-soil-in-south-west-nigeria