冻融作用对膨润土防渗毯防渗特性的影响  

Effect of freeze-thaw action on geosynthetic clay liner anti-seepage characteristics

作　　者：周春生[1,2] 史海滨[1] 于健 

机构地区：[1]内蒙古农业大学水利与土木建筑工程学院,呼和浩特010018 [2]内蒙古财经学院资源与环境经济学院,呼和浩特010051 [3]内蒙古水利科学研究院,呼和浩特010010

出　　处：《农业工程学报》2012年第5期95-100,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国际科技合作重点计划项目(2008DF70880);国家农业转化资金项目(2010GB2A400060);国家科技支撑项目(2007BAD88B04);内蒙古农业大学科技创新团队资助计划

摘　　要：为研究膨润土防渗毯(Geosynthetic Clay Liner)在寒旱区渠道衬砌应用中的防渗性能,该文采用室内模拟方法对3种膨润土防渗毯(分别为韩国、中国生产,编号为1#、2#、3#)的抗冻特性进行了研究,结果表明:采用黄河水水化31次冻融后,1#、2#、3#膨润土防渗毯自由膨胀体积增加了16.7%、4.5%、8.0%,滤失量降低了31.1%、28.9%、27.0%,屈服值增加了200.0%、23.3%、90.6%。31次冻融循环后滤出液EC值分别降低27.3%、27.0%、31.0%,渗透系数均增加了1个数量级,但渗透系数仍较小,仅为渠床土壤渗透系数的0.35%～0.72%;研究表明,膨润土防渗毯可用于西北干旱盐渍化地区渠道衬砌。In order to study the seepage control performance of Geosynthetic Clay Liner（GCL） in lining channel in the cold and arid regions,the antifreeze characteristics of three different GCL（produced in Korea and China,1#、2#、3#） were studied with indoor simulation method.The results showed that by hydrating with the Yellow River water and after 31 times of freeze-thaws,the free swelling volume of 1#、2#、3# GCL increased by 16.7%、4.5% and 8.0% respectively;The filtration loss reduced by 31.1%、28.9% and 27.0% respectively;The yield value increased by 200.0%,23.3% and 90.6% respectively,and the EC values of the filtrate reduced by 27.3%、27.0% and 31.0% respectively.The permeability coefficient increased by one order of magnitude,but was still small,which was 0.35-0.72% in canal bed.These indicated the GCL can be used in canal lining in the northwest arid and saline regions.

关 键 词：膨润土 剪切应力 试验 冻融循环 滤失量 渗透系数 

分 类 号：TV223.4[水利工程—水工结构工程]