水质对膨润土防水毯防渗效果影响研究

针对我国西北干旱寒冷盐渍化地区渠道防渗存在的问题，对拟引进使用的膨润土防水毯的膨胀性能及防渗效果进行研究，提出推广应用一种新型复合土工合成材料（膨润土防水毯）。选择3种膨润土防水毯产品。采取室内试验，分析了不同浓度及离子溶液对膨润土防水毯防渗效果的影响。试验表明溶液浓度膨润土膨胀性能影响较大．当矿化度大于5g／L时膨胀量明显减小。离子及浓度对韩国1号（两层聚丙烯薄膜防护）防渗性能影响最小，除与膨润土成分及含量有关外，两层聚丙烯薄膜防护层结构对防渗性能也有较大的影响。

Study on the Influence of Water Quality on Anti-seepage Effect of Geosynthetic Clay Liners

Aiming at the existing problems of canal anti-seepage in the northwest draught cold saline regions,this paper studied the swelling performance and anti-seepage effect of GCL(geosynthetic clay liners) which is preparing to be introduced to use.Choosing three types of GCL products,this paper analyzed the influence of different concentrations and ion solution on the anti-seepage effects of GCL through indoors experiment.The result indicated that the solution concentrations had greater influence on the swelling performance of GCL,and the swelling quantity would reduce obviously when the mineralization degree was more than 5 g/L.Ion and concentration had the smallest influence on the anti-seepage performance of the Korea 1st product,which had two-layer protective polypropylene membrane.Besides the composition and content of the GCL, the structure of two-layer protective polypropylene membrane had biggish influence on the anti-seepage effect.