الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Hydrocarbon contamination of soil has been a problem since the discovery of oil as a fuel service, particularly in developing nations. The presence of various kinds of automobiles and machinery has caused an increase in the use of engine oil. Used engine oil is disposed of by reuse in some industries or direct disposal, but in both cases, this leads to contamination of the soil with this used oil. Therefore, it is necessary to know the different geotechnical properties and behavior of the soil contaminated with this used oil to evaluate its use in any potential engineering application. This study aims to explore the effect of used engine oil on some properties of geotechnical soil by conducting some experiments in the laboratory such as compaction, California bearing ratio (CBR), direct shear, and consolidation tests. These experiments were conducted on clean soil and contaminated soil with different ratios of used engine oil. Contaminated soil samples were prepared by adding used engine oil in an amount of 4, 8, 12, and 16% of the dry soil weight. The results showed a remarkable variation in the geotechnical properties of the soil with the addition of the contaminant to the soil. Significant improvement occurred in most soil properties, with up to 8% contamination. As a result, this contaminated soil has been evaluated in an engineering application, which is its use as a sub-base layer in rural roads. A tank was made and filled with road layers, using contaminated soil as a sub-base layer. The contaminated soil used in the tank was prepared at the ratio of contaminant that gives the best soil properties (8%). The road layers in the tank were subjected to cyclic stress which represents the stress produced under the vehicle tire. The variables were the contaminated soil type, the contaminated layer thickness, the effective stress, and the number of cycles. Moreover, a two-dimensional axisymmetric finite element analysis on road layers was developed by using PLAXIS (ver. 20) finite element software package to investigate the effect of using contaminated soil on the structural response of rural roads.