摘要
电渗是使低渗透性土体排水固结的有效方法。为了了解电渗现象的基本规律,该文研制一套室内电渗试验设备,完成不同干密度高岭土试样的一维电渗试验。试验将土样分成6个部分分别进行监测,研究和分析土体电流、电渗出流体积、含水量、土壤溶液pH值和土体电阻等参数的变化。试验结果显示:在相同外加电压条件下,土样干密度越小,其总电阻越小,而电流和出流量越大,含水量变化也越大;电渗过程中土样内部伴随酸性带的发展和迁移,土体总电阻增加且电极附近区域电阻增长最为明显。试验证明电渗可以对高岭土试样进行有效脱水,但土体电阻的增加导致脱水效率逐渐降低。
Electro-osmosis is a potential effective method for dewatering and consolidation of soft soils with low permeability.An electro-osmosis system was developed in laboratory tests for dewatering of kaolin clay.The electrical current,volume of effluent,moisture content,pH,and electrical resistance were monitored for six layers of samples with different dry densities.The soil samples with lower dry densities have lower total resistances and the higher electrical currents,volumes of effluent and more change in moisture contents when the same voltage was applied.An acid transition zone developed in the samples with increased total flow resistance during the electro-osmosis and an apparent increase was found around electrodes.The results show that the electro-osmosis dewatering is effective for kaolin clay but becomes less effective with the increase electrical resistance.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第9期1353-1356,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学基金资助项目(50978139)
教育部科学技术重点项目(109006)
教育部新世纪优秀人才计划项目(NCET-07-0480)
关键词
高岭土
电渗
电场
含水率
干密度
PH
kaolin clay
electro-osmosis
electrical field
water content
dry density
pH
