摘要
为研究柴油污染对水泥改良后花岗岩残积土压实特性的影响,通过室内击实试验,以柴油和水为介质,得到了单一水介质和油水混合介质时土样的击实曲线.发现污染土样的最优含水率呈下降趋势,而最大干密度却呈一定幅度的上升趋势.同时通过液限和塑限联合测定法得到土样的稠度界限,发现其塑限变化趋势与最优含水率相似,即土样的液限、塑限以及塑性指数都是先增大再减小,并且在含油率为6%时达到峰值.最后通过SEM扫描电子显微镜进行观察,分析并得到柴油污染改良土击实特性微观结构.微观视角下,水泥和柴油会发生物理胶结作用,填充了土颗粒之间的孔隙,导致单位体积下土样的孔隙率减小,从而密度增大.
In order to study the influence of diesel oil pollution on the compaction characteristics of granite residual soil after cement improvement,the compaction curves of the soil with single water medium and oil-water mixture medium were obtained through indoor compaction tests.It was found that the optimum moisture content of contaminated soil samples decrease while the maximum dry density increase to a certain extent.At the same time,the consistency limit of soil samples was obtained by the combined determination of liquid limit and plastic limit.It was found that the change trend of plastic limit of soil samples is similar to the optimal water content.That is,the liquid limit,plastic limit and plastic index of soil samples increase first and then decrease,and reach the peak value when oil content is 6%.At last,the compaction characteristics of the improved soil polluted by diesel oil were analyzed and obtained by SEM.From the microscopic point of view,cement and diesel oil act as physical cementation,filling the voids between soil particles,resulting in the decrease of voids per unit volume and the increase of density of soil samples.
作者
杨蒙
陈秋南
蒋刘妮
谢云鹏
李长利
杨振宇
YANG Meng;CHEN Qiunan;JIANG Liuni;XIE Yunpeng;LI Changli;YANG Zhenyu(Hunan No.6 Engineering Co.,Ltd.,Changsha 410035,China;School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Key Laboratory of Geotechnical Engineering Stability Control and Health Monitoring,Hunan University of Science and Technology,Xiangtan 411201,China;China Machinery International Engineering Design Research Institute Co.,Ltd.,Changsha 410007,China)
出处
《湖南科技大学学报（自然科学版）》
CAS
北大核心
2022年第4期25-30,共6页
Journal of Hunan University of Science And Technology：Natural Science Edition
基金
国家自然科学基金资助项目(52078211
51909087)
湖南省自然科学基金资助项目(2020JJ4021)
湖南省教育厅开放基金资助项目(18K064)。
关键词
柴油
污染土
花岗岩残积土
击实
微观结构
diesel oil
contaminated soil
granite residual soil
compaction
microstructure
