Oil Contaminats Effect on the Dispersivity Potential and Shear Strength of Dispersive Clay Soils

Basic Divergent clay soils are soils that have high percentage of sodium ions.The soils prone to leaching when placed under water seepage and erosion. In this research, the impact of crude oil as a side effect of pollution (possibly positive) on the amount of divergence of the soil will be discussed. Therefore, first soil artificially by adding a solution of sodium hexametaphosphate were divergent and then some pinhole test on soil samples with different amounts of crude oil diverged (1, 3, 5 and 7%) were performed. In addition to this, the effect of crude oil pollutants on the shear strength and uniaxial testing was conducted to help. Results obtained showed that with presence of oil and increase in percentage of oil and the time of soil and oil contact, dispersivity of soil decrease. Thus with gradual increase of oil, the territory is quite divergent soil became non-divergent. Also the,single pivot (uniaxial )tests experiments showed that at the first samples strengths increase to 3% oil content and more oil quantities reduces the the resistance of the soil.