Earth Science Malaysia (ESMY)

Assessing geotechnical properties of Wetlands Area in Lagos Mainland Western Nigeria. This geotechnical research was conducted at Iyana-Ipaja community in Alimosho Local Government Area of Lagos State. Six soil samples and control samples were collected from seven different sampling points within this region for geotechnical analysis. Geotechnical properties index was carryout on the soil samples. Grain size The analysis, Specific Gravity, Atterberg Limits, Compaction Test, and Triaxial Tests was carried-out on Sample A, Sample B and Sample C. The liquid limit (LL) values for sample A, Sample B, and Sample C were 44.40%, 44.82%, and 45.13% respectively, while the plastic limit values were 28.63%, 33.30%, and 33.46% respectively. The plastic index values for samples A, B, and C were 16.76, 11.53, and 11.67 respectively. These soil samples were classified as inorganic clays of low to medium plasticity (CL) and were considered moderately plastic based on their plasticity index (PI) values being less than 17%. The natural moisture content values for soil samples A, B, and C were 98.02%, 33.22%, and 31.19% respectively. The percentages of fine Sand passing the 200 sieves were 84.35%, 65.29%, and 59.96% for samples A, Sample B and Sample C respectively, leading to their classification as Silty Sand (SM) with uniformly graded sand and silt mixture. The OMC and MDD for Sample A, Sample B and Sample C were found to be 24.4%, 26.3%, 27.5% and .34g/cm3, 1.17g/cm3, 1.27g/cm3 respectively. Wet weight measurements indicated variability but suggested characteristics of clay ranging from Very soft to Firm. The research suggests and concluded that the soil samples from the Iyana-Ipaja area of Alimosho LGA, Lagos, requires chemical stabilization, preferably with cement or lime, to be suitable for construction and geotechnical purposes.