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Geosynthetic-Geosynthetic Interface Behaviour Analysis Using Digital Imaging
Although there is an abundance of literature on the subject of the interface shear strength of geomembrane-geotextile interfaces, there is a dearth of information on the actual physical interaction at these interfaces. Displacement is required to achieve peak shear strength, following which, post peak shear strength reduction is typically observed. This study uses digital imaging techniques to investigate physical changes to the geomembrane surface during shearing in order to determine if geomembrane wear contributes to this post peak shear strength reduction. The study uses optical microscopes with digital image capture and two different scanning electron microscopes. The results show the importance of using an appropriate technique for the digital imaging as some techniques may result in misinterpretation of the physical changes to the surface. The study also identifies additional wear caused by material entering the shear area within the direct shear apparatus. This paper describes an analysis of sheared geomembrane samples using digital imaging techniques. The following conclusions are drawn: (1) The digital imaging technique used for analysis is important, as many features can be missed or misinterpreted if an inappropriate technique is employed. (2) The amount of wear is dependent on the normal stress during shearing. At 400 kPa significant damage is observed. This may have implications for tests at higher normal stresses. (3) The leading edge of the DSA apparatus can damage asperities that enter the shearing area. It is important to select sampling locations from within the existing shear area.
Geosynthetic-Geosynthetic Interface Behaviour Analysis Using Digital Imaging
Although there is an abundance of literature on the subject of the interface shear strength of geomembrane-geotextile interfaces, there is a dearth of information on the actual physical interaction at these interfaces. Displacement is required to achieve peak shear strength, following which, post peak shear strength reduction is typically observed. This study uses digital imaging techniques to investigate physical changes to the geomembrane surface during shearing in order to determine if geomembrane wear contributes to this post peak shear strength reduction. The study uses optical microscopes with digital image capture and two different scanning electron microscopes. The results show the importance of using an appropriate technique for the digital imaging as some techniques may result in misinterpretation of the physical changes to the surface. The study also identifies additional wear caused by material entering the shear area within the direct shear apparatus. This paper describes an analysis of sheared geomembrane samples using digital imaging techniques. The following conclusions are drawn: (1) The digital imaging technique used for analysis is important, as many features can be missed or misinterpreted if an inappropriate technique is employed. (2) The amount of wear is dependent on the normal stress during shearing. At 400 kPa significant damage is observed. This may have implications for tests at higher normal stresses. (3) The leading edge of the DSA apparatus can damage asperities that enter the shearing area. It is important to select sampling locations from within the existing shear area.
Geosynthetic-Geosynthetic Interface Behaviour Analysis Using Digital Imaging
Zaharescu, C.A. (author) / Fowmes, G.J. (author) / Dixon, N. (author) / Wu, H. (author)
2015
8 Seiten, Bilder, Tabellen, Quellen
Conference paper
Storage medium
English
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