Overall plastic geogrid in reinforced soil interface interaction highlights the remarkable reinforced friction mosaic bite performance

which has been widely used in reinforced earth structure.Pullout tests are thought to reflect the interface characteristics of reinforced material in landfill soil.Through pull-out test on plastic geogrid in soil rock mixture

interfacial friction coefficient between steel plastic geogrid and the mixture with different proportion of earth is determined.When the filling material is all the ballast materials

the interface coefficient of friction（interface friction angle）is the maximum.Under the natural condition

the interface friction coefficient is 0.81

the interface friction angle is 39°.In the saturated state

the interface friction coefficient is 0.63

the interface friction angle is 32.2°.Analysing the influence of the overburden pressure

rock water content and the proportion of soil to rock in the mixed in filling materials on the interfacial friction coefficient and interfacial friction angle.We conclude that for the mixed filling materials interface coefficient of friction and friction angle of interface decrease with the increase of overlying vertical loads.When the content of slag is certain

along with the increase of water content

the interface coefficient of friction（interface friction angle）decreases;when the water content filling matevials is certain

with the increase of stone slag content

the interface coefficient of friction（interface friction angle）increases.At the same time

two kinds of failure mode and effective thickness of reinforced plastic geogrid are tested and analyzed.