摘要
利用土工离心机考察了铜离子泄漏后6个月至3年的时间里非饱和土中铜离子的变化和污染物的迁移机理。通过4种黏性土的离心模型试验研究,总结出铜离子在这类土体中的扩散规律。铜离子在一年内,主要受重力影响和水力梯度的作用,随渗流运移,存在一个舌状竖向扩散峰,污染范围近似呈三角形;一年后扩散范围逐渐转变为近似的正方形。竖向扩散速度高于水平向。土体密实度对铜离子的扩散有较为明显的影响,有效的击实或者碾压有助于防止污染物迁移。黏粒含量对铜离子的迁移阻碍非常迅速而且有效,黏粒含量很小的变化都会对迁移范围和速度有较大的影响。
A series of centrifuge tests were performed to investigate the behavior of copper ionic migration in unsaturated cohesive soils. From this study, it is indicated that the hydraulic driven flow controlled the migration of copper ions in soils during the period of the first year. The contaminant region changes from a triangular shape in the first year to a more square like later. Vertical movement is more significant than horizontal. Compaction is a very practical method to reduce the hydraulic conductivity of the soil and thus to retard the movement of contaminants. It was demonstrated effective by centrifuge tests. Minor difference of clay content in natural soils will result in significant difference on copper ionic migration. When mixed with bentonite, this barrier effect of clay was enhanced.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2006年第11期1885-1890,共6页
Rock and Soil Mechanics
基金
国家自然科学基金资助项目(No. 50109003)
关键词
离心机
铜离子
非饱和土
centrifuge
copper ion
unsaturated soil
