INVESTIGATION OF GEOTECHNICAL PROPERTIES OF SELECTED FAILED ROADS SOIL SOUTH WESTERN NIGERIA
Abstract
The study investigates the impact of geotechnical indices on flexible pavement failures in Southwestern Nigeria, focusing on the role of soil properties in road durability. The research reveals that the region’s flexible pavements are prone to rapid deterioration, with prevalent issues such as cracking, rutting, and potholing due to inadequate attention to soil properties during construction. Soil samples from six states were analyzed for natural moisture content, specific gravity, Atterberg limits, and particle size distribution to classify their suitability for road subgrade, subbase, and base materials. Results indicate that soil properties, including high moisture content and clay composition, contribute to pavement weaknesses. The study concludes that for enhanced pavement performance, subgrade layers require strengthening through compaction and stabilization, optimized layer thickness, quality materials, and regular monitoring. These findings aim to inform sustainable pavement designs that better withstand high traffic volumes and climatic conditions in the region.
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