... of subgradesthe subgrades must be tamped before paving the GCLs, the surfave should be smooth. And it ... should be more than 30cm.the construction of GCLs ahould be begin until checking out the foundation ... affecting on the overlapping quality.to avoid the GCLs gliding, had best to fix it with nails ... bevel. Such as drawing.both sides of the GCLs are geotextile and woven geotextile, when paving, the ...