柴油污染对高岭土液塑限影响试验研究

he research about engineering property change of soil contaminated by organic compounds has drawn more and more attention in the field of geoenvironmental engineering. However, most studies are still mainly focused on sands, and few works are related with clayey soil. Thus, diesel oil is adopted as organic contaminant, and a kind of commercial kaolinite is used as the representative of clayey soil. The contaminated soil specimens are manually prepared in the laboratory. The modified oven-dry moisture content is first studied in consideration of the mutual existence of water and diesel oil in pore space of clay. Then the Atterberg limits of contaminate soil are measured through combined test method in order to experimentally study the influence of diesel oil content on the Atterberg limits of kaolinite. It is found that the moisture content obtained from traditional oven-dry method is lower than that of the real water content for oil-contaminated kaolinite. As the oil content is increased, the difference between the measured moisture content from traditional oven-dry method and the real water content gets larger. In addition, both the liquid limit and plastic limit of the contaminated kaolinite are nonlinearly decreased with the increase of the diesel oil content. Their variation trend is quite similar to each other, thereby the diesel oil content nearly has no effect on the plasticity index of contaminated kaolinite.