摘要：Based on reuse of oil contaminated soil, cohesion and internal friction angle of clean clay-loam, crude oil contaminated clay-loam and diesel contaminated clay-loam were measured through direct shear test, the influence of water contents, crude oil content ratios and diesel oil content ratios on the shear strength of unsaturated clay-loam was comparatively analyzed. The results indicated that the shear strength decreased, as the water and oil in natural density is increasing. The decrease rate of cohesion was in the following order: water> diesel > crude oil. Diesel has little effect on the internal friction angle, while crude oil content ratio significantly affects the change in internal friction angle. Under the condition of maximum dry density, both diesel and crude oil increased the shear strength of contaminated soil and the increase of diesel-contaminated soil was greater than that of crude oil contaminated soil. Further study shows that the characteristics of oil contamination have a significant influence on soil strength. The oil mainly weakens the water and soil through non-electrical properties, which makes the clay- loam obviously ^sandy^ and improves the shear strength of the soil. While the strength of crude oil contaminated clay-loam slightly lower than that of diesel oil contaminated clay-loam because of lubrication and viscosity.
