It is common that composite impervious layers of GM+GCL,which are superior to only GM or CCL,are used in solid waste landfills.

• 土工膜(GM)+压实性粘土(CCL)的复合防渗层在固体废物填埋场的防渗系统中已较为常用,它的防渗效果比单独的GM或CCL要好得多;