الفهرس 
Arabic summary
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Abstract
The present research is concerned with the study of the effect of oil contamination on the physical properties, shear strength parameters and consolidation properties of clayey soils.
Oil-contaminated clayey soil was noticed in a big residential district in Sohag city, the capital ofSohag governorate in upper-Egypt. Oil leakage into soil resulted from breakage of three oil-pipe lines for a long period, which are carrying kerosene, solar and diesel from a pumping station on Lire River Nile shore to huge oil storage tanks along a distance ofabout 2.0 kms,
Contaminated soil samples were extracted from the site and tested in the laboratory. Two types of uncontaminated soil, i.e. clean soil, were extracted from other site with different plasticities. Threetypes ofoil with different viscosities 25. 160 and 420 centistokes at 30°C were mixed with clean soils at percentages 5%,. 10% and 15%.