Journal Published Online: 15 July 2014
Volume 37, Issue 5

Image-Segmentation Technique to Analyze Deformation Profiles in Different Direct Shear Tests



Results from interface shear tests on sand–geosynthetic interfaces are examined in light of surface roughness of the interacting geosynthetic material. Three different types of interface shear tests carried out in the frame of direct shear-test setup 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 techniques in MATLAB. A woven geotextile with moderate roughness and a geomembrane with minimal roughness are used in the tests. The effect of surface roughness of the geosynthetic material on the formation of shear bands, movement of sand particles, and interface shear parameters are studied and compared through visual observations, image analyses, and image-segmentation techniques.

Author Information

Vangla, Prashanth
Civil Engineering Dept., Indian Institute of Science, Bangalore, IN
Gali, Madhavi
Civil Engineering Dept., Indian Institute of Science, Bangalore, IN
Pages: 13
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Stock #: GTJ20130138
ISSN: 0149-6115
DOI: 10.1520/GTJ20130138