Evaluation of geosynthetic interface friction at low normal stress: comparison between two different test procedures

The interface friction between geosynthetics has previously been extensively studied with reference to medium-high contact stresses. strength at low stress is a less investigated chapter whose importance, however, evident for the stability of geosynthetic landfill barriers during construction stage and covering systems. inclined plane most used laboratory test measuring normal stresses as 5 kPa. This type test, not free from criticalities, due non-uniformity induced by inclination plane. Alternatively, it possible extrapolate results classic direct shear which, generally cannot be performed such values. paper compares data provided tests an experimental apparatus capable performing horizontal vertical peculiarity this device guarantee constant growth rate tangential equivalent what happens test. good agreement obtained two different interfaces leads way future innovations insights on topic.