Interface instability between HDPE geomembrane and sand is a main reason for landfill structural failure on lining interface. Though frictional coefficient of textured geomembrane is large

it is easy to be splited by the huge tension force accumulated on the landfill lined slope

or to be weared and teared. A novel concept of reinforced HDPE geomembrane is proposed. A series of direct shear tests were carried out to investigate interfacial characteristics and stress mechanism under different normal stresses and spaces of reinforcement. Comparison was made between stress-strain relationship and strength property of reinforced geomembrane

smooth geomembrane and textured geomembrane. It was shown that cohesion of strip geomembrane was increased

internal frictional angle was reduced

while both of lump geomembrane were increased considerately. Along with decreasement of space

cohesion of reinforced geomembrane added. However there is a gradual reduction of internal frictional angle when it exceeds a specific value. Compared with smooth geomembrane and textured geomembrane

reinforced geomembrane

as is a new kind of geosynthetics

not only has a higher interface shear strength with sand

but also has a better rupture strength.