柴油污染对高岭土液塑限影响试验研究.doc


柴油污染对高岭土液塑限影响试验研究#
刘志彬,方伟*
(东南大学交通学院岩土工程研究所,南京市 210096)
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摘要:近年来,土体遭受有机物污染后引起其工程性质改变的研究越来越受到环境岩土工程界关注,而目
前大多数研究工作主要是针对砂土进行的,对于黏性土的相关研究则较少开展。基于此,选择柴油作为有
机污染物,商业高岭土作为黏性土材料,在室内人工制备成柴油污染土。首先分析了水油共存条件下,黏
性土烘干含水量的修正测试技术。然后采用液塑限联合测定法对污染土的界限含水率进行测定,试验研究
了柴油含量对高岭土界限含水率的影响规律。结果表明:常规烘干法所得含水率数值低于污染土的真实含
水率,而且随着柴油含量的增加,两者间差值越大;随着柴油含量的增加,高岭土的液限和塑限均非线性
减低,且两者的变化趋势相近,因此柴油污染土的塑性指数受柴油含量影响不明显。
关键词:污染土;柴油;高岭土;界限含水率;烘干法
中图分类号:TU411
Experimental study on the influence of diesel oil on the
Atterberg limits of kaolinite
LIU Zhibin, FANG Wei
(School of Transportation, Southeast University, Nanjing 210096)
Abstract: The research about engineering property change of soil contaminated pounds
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 anic contaminant, and a kind mercial 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 bined
test method in order to experimentally study the influence of diesel oil content on the Atterbe