Abstract: The design conception of composite lines consisting of a geomembrane(GM),geosynthetic clay liners(GCLs) and compacted gravel soils in landfills was presented based on the climate characteristics,gravel soils material rich in nature,and GCLs have been exported all over the world for various applications.The analysis results from the test data of gravel soils material suggest that the power to resist the collapse of wetting-drying and freezing-thawing,long-term barrier performance,and the general ...