Centrifuge tests to investigate global performance of geosynthetic-reinforced pile-supported embankments with side slopes |
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| Affiliation: | 1. Federal University of Rio Grande - FURG, Rio Grande - RS, School of Engineering, Brazil;2. Federal University of Rio de Janeiro, COPPE, Rio de Janeiro, RJ, 21945-970, Brazil;3. LUNAM Univ., IFSTTAR, Department GERS, Laboratory Geomaterials and Models in Geotechnics, Route de Bouaye, CS4, 44344, Bouguenais Cedex, France;1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Geotechnical Research Institute, Hohai University, Xi Kang Road, Nanjing 210098, China;2. Geotechnical Research Institute, Dept. of College of Civil and Transportation Engineering, Hohai University, Nanjing, China;1. Department of Civil Engineering, 23 College Walk, Monash University, Melbourne, Vic. 3800, Australia;2. Golder Associates Pty. Ltd. Building 7, Botanicca Corporate Park, 570 – 588 Swan Street, Richmond, Vic. 3121, Australia;3. GeoEngineering Centre at Queen''s-RMC, Queen''s University, Ellis Hall, Kingston, ON K7L 3N6, Canada;1. School of Engineering, Design and Built Environment, Western Sydney University, Kingswood, NSW 2751, Australia;2. Cardno, L9 The Forum, 203 Pacific Hwy, St Leonards NSW 2065, Australia |
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| Abstract: | Three centrifuge model tests were conducted to investigate the influence of the number of geosynthetic layers and the pile clear spacing on the global performance of Geosynthetic-Reinforced Pile-Supported (GRPS) embankments with side slopes constructed on soft soil foundations. This study found that the change of the geogrid number from one to two did not significantly affect the foundation settlement, the geogrid deflection, and the vertical stress at the embankment base. For the GRPS embankment with a single geogrid layer, the geogrid strain distribution at the embankment base showed an “M” shape along the transverse direction with the maximum strain near the embankment shoulder. When two geogrid layers with sand in between were used, the upper and lower layers showed different strain distributions with the maximum strains happening near the embankment shoulder and at the center of the embankment for the upper and lower layers respectively. The strains of the upper geogrid were smaller than those of the lower geogrid. Smaller pile clear spacing reduced the geogrid deflection and the foundation settlement. Despite the change of the pile clear spacing, the progressive development of soil arching with the normalized displacement at the embankment base followed a similar trend without an obvious stress recovery stage. |
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| Keywords: | Geosynthetics Centrifuge test Embankment Pile Settlement Soil arching Strain |
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