摘要
室内采用柔性壁渗透仪实测了膨润土改性黄土的渗透性能,分别在控制渗透时间、围压和渗透压等条件下探究了各自对改性黄土渗透系数的影响。研究表明,试验初期试样的渗透系数在同一数量级上有较大波动,随着持续时间增加渗透系数趋于稳定,稳定后几乎不随时间发生变化,增大围压和渗透压都可以引起改性黄土渗透系数在同一数量级上降低。因此,在填埋场设计时可以通过预测防渗衬里的围压和渗透压来预留渗透系数的安全储备。
The process stress of sanitary landfill is changing constantly in use,which will cause the penetrative conditions to change in landfill liner.It is of great realistic significance to explore the influence of these changes on the seepage performance of landfill liner.The permeability of modified loess soil by bentonite was tested with a flexible-wall permeameter,and the impact on coefficient of permeability of the modified loess soil was investigated under different conditions of penetration time,confining pressure and osmotic pressure.The research results show that coefficient of permeability of modified loess soil fluctuates in the same order in the initial stage,and the coefficient of permeability tends to be stable.Furthermore,the coefficient of permeability of modified loess soil can be reduced in the same order with the increasing confining pressure and osmotic pressure.Therefore,the safety of coefficient of permeability can be reserved by predicting the penetrative conditions in a sanitary landfill liner design.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2010年第5期108-112,117,共6页
Hydrogeology & Engineering Geology
基金
国家自然科学基金资助项目(50678075)
中国建筑股份有限公司资助项目(CSCEC-2008-Z-21)
关键词
改性黄土
渗透系数
围压
渗透压
modified loess soil
coefficient of permeability
confining pressure
osmotic pressure
