Tag Archives: : Erosion

Stabilization of Erosive Soil Using Some Inorganic Chemicals: Oba Excavation Site, as a Case Study (Published)

Soil erosion has become a serious topic of discussion in Anambra State, Nigeria because it has constituted to serious negative challenges in the economic livelihood of different communities in the State. This study is therefore aimed at using some inorganic chemicals to stabilize an erosive soil in Oba (a town in Anambra State). Laboratory analyses for the determination of the particle size distribution and inorganic chemical stabilization determination were carried out on the Oba soil sample. From the results obtained, it was discovered that the soil sample has a high percentage of sandy soil particles compared to the clay and the silt soil particles. After the soil sample was stabilized using the AlCl3, CaCl2, MgCl2, Ca(OH)2 and CaCO3, it was discovered that AlCl3 and CaCl2 had the highest stabilizing power while the Ca(OH)2 had the least stabilizing power. This was confirmed by using a pocket penetrometer.

Keywords: : Erosion, Inorganic, chemicals, penetrometer

Particle Size and Quick Undrained Triaxial Analysis of Soil Samples from Major Gullies Sites in Edo State (Published)

The issue of gully erosion is of major concern in Nigeria. The study was carried out in Edo state, Southern Nigeria. Edo State was chosen as the study area due to the fact that the magnitude of gully erosion has resulted in loss of lives and properties, destruction of arable lands and wastage of large areas of usable land. In the study particle test and quick undrained triaxial analysis of soil sample from the major gullies sites were determined. The analysis of soil samples collected from Edo South are more sand, this also explain why the areas are susceptible to gully erosion. This can also be attributed to the high volume of soil that is wash away in the area. The compressive strength of these soil samples collected from the area are in the ranges of 163Kn/m at Ambrose Ali University in Edo Central to 232 Kn/m at Igueben also Edo Central. The bulk density in the area ranges from 1.70Mg/m3 at Ambrose Ali University Ekpoma in Edo Central to 2.66Mg/m3 at Oka in Edo South and the moisture content ranges from 26.7% at Oka in Edo South to 32.0% at Ambrose Ali University Ekpoma in Edo Central

 

Keywords: : Erosion, Gully, Particle, Triaxial, Undrained

SUITABILITY OF LOCALLY SOURCED GRANULAR AGGREGATES FROM SOUTHWESTERN NIGERIA AS FILTERS FOR EROSION CONTROL IN EMBANKMENT DAMS (Published)

Filter with simple but effective job is one of the principal parts in an embankment dam which is able to immune the dam against erosion, prevent water escape and seal unfavorable cracks that may occur through the impermeable core. Geotechnical properties of granular materials (filters) from two States in the Southwestern Nigeria were presented in this paper, using locally and commercially sourced aggregates. Nine granular soil samples were collected: peat and sharp sands from two borrow pits; gutter and river sands with gravel from Ogbomoso, Oyo State; quarry dust and granite from Ministry of Transport Osogbo, Osun State. Samples were subjected to the following laboratory tests: Particle size analysis, Atterberg limit, Compaction, Specific Gravity, Constant Head Permeability. Results of the particle size analysis passing sieve No. 200 for peat, sharp, gutter, and river sands, with gravel, quarry dust and granite were 2.94%, 1.12%, 0.81%, 1.35%, 3.13%, 0.68%, 0.58%, 5.93% and 0.32% respectively while those passing through sieve No. 4 are 97.92%, 89.91%, 97.22%, 95.90%, 26.76%, 88.05%, 96.50%, 97.93% and 24.71% respectively. The plasticity Index were 5.13%, 6.94%, 8.17%, 6.11%, 8.37%, 0.59%, 2.47%, 2.48% and 10.76% respectively. Optimum moisture content and maximum dry density were (5.11% ;1830 Kg/m3) , (6.57% ;1960 Kg/m3) , (12.36% ;1940 Kg/m3) , (8.57% ;1930 Kg/m3) , (8.73% ;2080 Kg/m3) , (11.86% ;2150 Kg/m3) , (7.73% ;1820 Kg/m3) , (6.10% ;1840 Kg/m3) and (6.29% ;1720 Kg/m3) respectively. Specific gravities of the samples were 2.73, 2.70, 2.75, 2.80, 3.02, 2.84, 2.85, 2.82 and 3.98 respectively. Permeability coefficients were 3.54 × 10-5cm/s, 3.14 × 10-5cm/s, 3.59 × 10-5cm/s, 3.64 × 10-5cm/s, 2.59 × 10-5cm/s, 3.09 × 10-5cm/s, 2.87 × 10-5cm/s, 2.78 × 10-5cm/s respectively. The locally sourced materials are adequate and suitable to serve as filter materials, with relatively low cost compared to commercially sourced aggregates

Keywords: : Erosion, Filters, Geotechnical Properties, Granular Material, Locally Sourced

Suitability of Locally Sourced Granular Aggregates from Southwestern Nigeria as Filters for Erosion Control in Embankment Dams (Review Completed - Accepted)

Filter with simple but effective job is one of the principal parts in an embankment dam which is able to immune the dam against erosion, prevent water escape and seal unfavorable cracks that may occur through the impermeable core.

Geotechnical properties of granular materials (filters) from two States in the Southwestern Nigeria were presented in this paper, using locally and commercially sourced aggregates. Nine granular soil samples were collected: peat and sharp sands from two borrow pits; gutter and river sands with gravel from Ogbomoso, Oyo State; quarry dust and granite from Ministry of Transport Osogbo, Osun State. Samples were subjected to the following laboratory tests: Particle size analysis, Atterberg limit, Compaction, Specific Gravity, Constant Head Permeability.

Results of the particle size analysis passing sieve No. 200 for peat, sharp, gutter, and river sands, with gravel, quarry dust and granite were 2.94%, 1.12%, 0.81%, 1.35%, 3.13%, 0.68%, 0.58%, 5.93% and 0.32% respectively while those passing through sieve No. 4 are 97.92%, 89.91%, 97.22%, 95.90%, 26.76%, 88.05%, 96.50%, 97.93% and 24.71% respectively. The plasticity Index were 5.13%, 6.94%, 8.17%, 6.11%, 8.37%, 0.59%, 2.47%, 2.48% and 10.76% respectively. Optimum moisture content and maximum dry density were (5.11% ;1830 Kg/m3) , (6.57% ;1960 Kg/m3) , (12.36% ;1940 Kg/m3) , (8.57% ;1930 Kg/m3) , (8.73% ;2080 Kg/m3) , (11.86% ;2150 Kg/m3) , (7.73% ;1820 Kg/m3) , (6.10% ;1840 Kg/m3) and (6.29% ;1720 Kg/m3) respectively. Specific gravities of the samples were 2.73, 2.70, 2.75, 2.80, 3.02, 2.84, 2.85, 2.82 and 3.98 respectively. Permeability coefficients were 3.54 × 10-5cm/s, 3.14 × 10-5cm/s, 3.59 × 10-5cm/s, 3.64 × 10-5cm/s, 2.59 × 10-5cm/s, 3.09 × 10-5cm/s, 2.87 × 10-5cm/s, 2.78 × 10-5cm/s respectively.

The locally sourced materials are adequate and suitable to serve as filter materials, with relatively low cost compared to commercially sourced aggregates.

 

Keywords: : Erosion, Filters, Geotechnical Properties, Granular Material, Locally Sourced