The numerical study of the effect of the crude oil contamination on the stability of clayey soil slope

Document Type : Research Article


1 Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Assistant Professor, Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran


The presence of oily materials (crude oil contamination) in the clayey soil with low liquid limit (CL) causes the occurrence of changes in the stress-strain curve, wedge failure, plastic region, and strain energy of the soil slopes compared the uncontaminated soils due to the physical and chemical processes. These changes mostly cause the decrement in the safety factor against failure, the increment of the plastic region, and the decrement of the stability of the soil slopes. Yet, the effect of crude oil contamination on the parameters of the shear strength of the soil has been tested by the direct shear test as well as the bed reaction module by the plate loading test for various clayey and sandy soils. In this research, the effect of the oil contamination changes in the range of 0-16% (0-4%, 4-8%, 8-12%, 12-16%) on the safety factor of the stability of clayey soil slope has been studied by the numerical modeling of finite element method in ABAQUS software. The heights of clayey soil slopes are 10, 13, and 16 meters and the degree of the soil slope is 53. The results of this research show that the increment of the oil contamination will lead to the decrement of the stability of the clayey soil slope. It can be predicted that the safety factor value of the clayey soil slope can decrease up to 72% by increasing the oil contamination from 0 to 16%. Also, a 4% increment in the amount of crude oil contamination in clayey soil slope (12% to 16% oil contamination) can increase the horizontal displacement by 2 to 3 times, and vertical displacement by 3 to 4 times.


Main Subjects

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