Characterization of soil-geosynthetic interaction based on surface roughness studies

摘要

Results from interface shear tests on sand-geosynthetic interfaces arc examined in the light of surface roughness of the interacting gcosynthctic material. Three different types of interface shear tests carried out using a modified direct shear test set-up are compared to understand the effect of parameters like box fixity and symmetry on the interface shear characteristics. Formation of shear bands close to the interface is visualized in the tests and the bands are analyzed using image segmentation technique implemented in MATLAB. A woven geotExtile with moderate surface roughness and a smooth polyester film are used in the tests. Effect of surface roughness of the geosynthetic material on the formation of shear bands, movement of sand particles and interface shear parameters is studied and compared through visual observations and image segmentation techniques.