New approach to junction efficiency analysis of hexagonal geogrid using digital image correlation method |
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| Affiliation: | 1. Department of Civil Engineering, National Central University, Jhongli, Taiwan, ROC;2. Department of Mass Rapid Transit, Sinotech Engineering Consultant, Ltd, Taipei, Taiwan, ROC;1. VNU Key Laboratory of Geo-environment and Climate Change Response, University of Science, Vietnam National University, Hanoi, Viet Nam;2. Faculty of Advanced Science and Technology, Kumamoto University, Japan;3. Vietnam Japan University, Vietnam National University, Hanoi, Viet Nam;4. Faculty of Geology, University of Science, Vietnam National University, Hanoi, Viet Nam;1. GeoEngineering Centre at Queen''s-RMC, Dept. of Civil Engineering, Queen''s Univ., Kingston, ON, K7L 3N6, Canada;2. Canada Research Chair in Geotechnical and Geoenvironmental Engineering, GeoEngineering Centre at Queen''s-RMC, Dept. of Civil Engineering, Queen''s Univ., Kingston, ON, K7L 3N6, Canada;1. Department of Geotechnical Engineering (SGS), São Carlos School of Engineering (EESC), University of São Paulo (USP), São Carlos, São Paulo, Brazil;2. Mauá Institute of Technology (IMT), University Center, São Caetano do Sul, São Paulo, Brazil;3. Department of Transportation Engineering (STT), São Carlos School of Engineering (EESC), University of São Paulo (USP), São Carlos, São Paulo, Brazil;1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, 310058, China;2. Engineering Research Center of Urban Underground Space Development of Zhejiang Province, Hangzhou, 310058, China;3. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Institute of Geotechnical Engineering, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, 310058, China;4. Zhejiang Institute of Hydraulics & Estuary, Zhejiang Institute of Marine Planning and Design, Hangzhou, 310058, China |
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| Abstract: | Geosynthetics are commonly used in many civil engineering applications. At the same time, intensive development of these materials is being carried out. Therefore, it becomes more and more important to correctly determine the mechanical parameters of geosynthetics in laboratory tests. This is especially important for more complicated hexagonal geogrids. This article presents the results of the laboratory research carried out to evaluate the junction efficiency of hexagonal geogrid under static load by analyzing deformations of geogrid junctions and ribs. A new approach to determination the efficiency is given by the newly defined strain junction efficiency coefficient based on the true principal strains. In the laboratory tests the digital image correlation (DIC) method was used. This method allowed for the determination of displacements and strains of geogrid specimens in any direction and at any point. The results of the conducted research and analysis indicate that the proposed innovative junction effectiveness assessment method enables a better presentation of the geogrid performance at different levels of tensile load. In addition to the parameters given in the technical approval for this material, the proposed new strain junction efficiency coefficient can be an effective parameter for evaluating hexagonal geogrid performance at different strain levels. |
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| Keywords: | Hexagonal geogrid Geosynthetic Digital image correlation (DIC) Tensile testing Geogrid junction efficiency |
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