_____________________________________________________________________________________________________ *Corresponding author: Email: aapata@unilag.edu.ng; J. Eng. Res. Rep., vol. 24, no. 10, pp. 1-12, 2023 Journal of Engineering Research and Reports Volume 24, Issue 10, Page 1-12, 2023; Article no.JERR.97900 ISSN: 2582-2926 Site Investigation and Shear Strength Properties of Soil A. C. Apata a* , Ismail Abdullahi a , U. U. Imoh b and Praise Dawodu Onimisi a a Department of Civil and Environmental Engineering, University of Lagos, Nigeria. b Civil Engineering Department, Akwa Ibom State University, Nigeria. Authors’ contributions This work was carried out in collaboration among all authors. Author ACP conceptualized the study, prepared the sample and wrote the first draft of the manuscript. Author IA carried out the experimental tests and analyzed the test results, managed the analysis of the study. Author UUI assisted with some of the analysis work. Author PDO proofread and edited the manuscript and is the correspondent for the manuscript. All authors read and approved the final manuscript. Article Information DOI: 10.9734/JERR/2023/v24i10843 Open Peer Review History: This journal follows the Advanced Open Peer Review policy. Identity of the Reviewers, Editor(s) and additional Reviewers, peer review comments, different versions of the manuscript, comments of the editors, etc are available here: https://www.sdiarticle5.com/review-history/97900 Received: 20/01/2023 Accepted: 23/03/2023 Published: 28/03/2023 ABSTRACT This study examined the soil's shear strength qualities at various depths with natural soil moisture content. At various depths below the surface of the ground, ranging from 400mm to 24.75m for point 1 and 400mm to 11.25m for point 2, the soil sample was taken using the drilling method. Wet sieve analysis was used to determine the distribution of the grains, and each soil sample's natural moisture content was calculated. Other fundamental tests included the Atterberg limit test, specific gravity, and sieve analysis. The data revealed that silt and clay make up the soils at points 1 and 2, with the soil at point 2 being more plastic than the soil at point 1. In Addition, it was discovered from the results that soil shears more quickly at increasing in the depth of from ground surface and that the cohesiveness index and angle of internal friction are negatively associated. Original Research Article