阴离子表面活性剂对黄土力学特性的影响  

Influence of anionic surfactants on mechanical characteristics of loess

作　　者：唐晓武[1] 寇乃羽[1] 李振泽[1] 陈云敏[1] 唐强[1] 

机构地区：[1]浙江大学软弱土与环境土工教育部重点实验室,杭州310058

出　　处：《岩土力学》2011年第1期141-145,共5页Rock and Soil Mechanics

基　　金：中央高校基本科研业务费专项资金(No.2009QNA4026);教育部博士点基金(No.20090101110075)

摘　　要：土体污染问题日趋严重,土体中污染物的环境效应已成为当前的研究热点问题之一,但对土体工程性质的影响关注不足。以黄土为对象,试验研究了阴离子表面活性剂对黄土力学性能的影响。阴离子表面活性剂具有弱化作用,可导致黄土黏聚力的下降、压缩性提高、渗透性降低,但可降低黄土的湿陷性。结合土-水特征曲线和扫描电子显微镜观察,进一步解释了污染物对土体力学性能产生影响的作用机制。在工程实践中,既要防止阴离子表面活性剂对黄土力学特性的劣化,同时又要注重其降低黄土的湿陷性。The environmental effect of soil contamination recently has aroused considerable public concern since the increasing soil pollution, however, less attention was given to engineering properties of contamination laden soil. Therefore, the influences of sodium dodecyl benzene sulfonate on the mechanical characteristics of loess have been investigated by the authors. It has been proved that the pollution can weaken the loess, reducing cohesion, compression strain and permeability, as well as limiting collapsibility. Moreover, the contamination mechanism towards soil mechanical characteristics was discussed with the assistance of scanning electron microscope in junction with the soil water characteristic curve. It is necessary to prevent the deteriorated effect of anionic surfactants on the loess in the engineering in future. Simultaneously it could be applied to reducing the collansibilitv of loess.

关 键 词：表面活性剂 黄土 力学特性 土-水特征曲线 

分 类 号：TU411[建筑科学—岩土工程]