GCL在垃圾填埋场中的用量占其总用量的90%，而填埋场中的沥滤液含有大量高于1价的阳离子(如Ca2+，Mg2+等)，它们与GCL中的阳离子发生离子交换，影响GCL的防渗性能。经研究分析GCL膨润土中的阳离子与沥滤液中的阳离子发生离子交换的条件、机理、过程以及它们对GCL防渗能力的影响，提出了有针对性的解决办法。

The dosage of geosynthetic clay liner (GCL) is very great in landfills (about 90 percent of its sum dosage).The leachate in the landfills involves a lot of multi-valence cations,such as Ca2+, Mg2+,etc.,Ion exchange between these cations and cations in GCL will influence GTCL'S hydraulic conductivity.This paper presents the condition,mechanism and process of ion exchange between the ions of bentonite in the GCL and ions in leachate and their effects on GCL's impermeability,and some resolution methods are proposed.