Comparative Analysis of the Geotechnical Properties of Soil for Road Subgrade in Anambra State: A Case Study of Onitsha, Nnewi, Awka, and Ihembosi

Before commencing any engineering project, it is crucial to understand the geotechnical properties of the soil. The construction of buildings, roads, and bridges relies on solid and efficient design criteria, which require a thorough assessment of the soil’s characteristics at the construction site. Soil investigation is essential for determining the behavior and stability of different soil types under stress, ensuring the feasibility and durability of engineering projects. To determine whether the soil from Onitsha, Nnewi, Awka, and Ihembosi in Anambra State is suitable for use as road subgrade, this study examines its geotechnical properties. Laboratory tests conducted include particle size distribution, specific gravity, Atterberg limits, shear strength, permeability, and compaction characteristics. The findings provide insights into the soil’s engineering behavior, particularly regarding its load-bearing capacity and potential need for stabilization.