Assesments of Frictional Properties of Geosynthetics Interface by Small Direct Shear Test

In this study, the frictional properties between geotextiles and geomembranes were estimated for utilization in the design of waste landfill systems. The shear stress at three different types of shear rates and each normal stress were evaluated by direct shear test. All eight geomembrane/geotextile interfaces showed post-peak reductions in shear strength and similar stress-strain curve patterns regardless of the type of materials. These post-peak strength reductions were apparently the polishing effects on the geomembrane surface. The shear rate showed no significant effects on the shear strength in each geosynthetic interface regardless of the type of geotextiles. The shear strength between geosynthetics interfaces increased proportional to the increasing normal stress. The parameters influencing the interface frictional properties between geomembrane and geotextile were the fiber length and type and the fiber diameter. The filament type in nonwoven geotextile exhibited higher frictional forces than other geotextiles.

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