柴油污染土的含水量计算方法与界限含水量变化规律  

Calculation method for water content of diesel oil contaminated soils and changing laws in Atterberg limit

作　　者：曾玲玲[1] 周梦学 王钢[1] 刘松玉[3] 洪振舜[3] 

机构地区：[1]福州大学土木工程学院,福州350108 [2]均和房地产土地评估咨询有限公司,厦门361004 [3]东南大学岩土工程研究所,南京210096

出　　处：《东南大学学报（自然科学版）》2016年第6期1278-1283,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金重点资助项目(41330641);福建省杰出青年科学基金资助项目(2016J06010)

摘　　要：以2种天然沉积土和钙基膨润土、钠基膨润土为源土,配置具有不同柴油含量及不同目标含水量的柴油污染土,进行柴油污染土的含水量测定及界限含水量试验研究.提出了柴油污染土的起始可挥发含油量的概念,建立了能够同时考虑柴油挥发性和黏土矿物对柴油吸附作用的含水量计算方法.结果表明,以天然沉积土为源土的含油污染土的液限和塑限均随含油量的增加呈先增大后减小的趋势;以钙基膨润土和钠基膨润土为源土的含油污染土的液限随含油量的增加而减小,塑限则呈相反的变化规律.柴油污染对塑限的影响明显大于对液限的影响.以钙基膨润土和钠基膨润土为源土的含油污染土的塑性指数随含油量的增加而减小,以天然沉积土为源土的含油污染土的塑性指数则呈相反的变化规律.By taking two natural clays and two clay minerals of calcium bentonite and sodium bentonite as the source of soil, the diesel oil contaminated soils with different contents of diesel oil and different water contents were prepared. The tests for the water contents and the Atterberg limits of the diesel oil contaminated soils were performed. A new concept was proposed for describing the initially volatile contents of the diesel oil contaminated soils, and a new calculation method for the water contents of the diesel oil contaminated soils was described by considering both the volatility of diesel oil and the adsorption of diesel oil by clay particles. The results that show the liquid limits and the plastic limits of the diesel oil contaminated soils prepared with original natural clays increase firstly and then decrease with the increase of the content of diesel oil. The liquid limits of the diesel oil contaminated soils prepared with two clay minerals of calcium bentonite and sodium bentonite decrease monotonously with the increase of the content of diesel oil, but contrary trends are found for the plastic limits. The influence of diesel oil on the plastic limits is obviously greater than that on the liquid limits. In addition, the plasticity indices of the diesel oil contaminated soils prepared with two clay minerals of calcium bentonite and sodium bentonite decrease monotonously with the increase of the content of diesel oil, but contrary changing laws are found for the diesel oil contaminated soils prepared with natural clays.

关 键 词：柴油污染土 含水量 挥发性 界限含水量 塑性指数 

分 类 号：TU411[建筑科学—岩土工程]