Geosynthetic-reinforced pile-supported embankments with caps in a triangular pattern over soft clay |
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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 Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;2. Priority Research Centre For Geotechnical And Materials Modelling, Faculty of Engineering and Built Environment, The University of Newcastle, Callaghan, NSW, Australia;3. Key Laboratory of High-Speed Railway Engineering of Ministry of Education, School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;1. Department of Civil Engineering, National Institute of Technology Surathkal, Mangalore, 575 025, India;2. Department of Civil Engineering, Indian Institute of Technology, Chennai, 600 036, India |
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| Abstract: | Given the limit studies on the behavior of GRPS embankments with different numbers of geosynthetic layers and pile caps in a triangular pattern, this paper conducted a series of three-dimensional (3-D) numerical analyses. The numerical model was verified based on a well-instrumented large-scale test. A 3-D soil arch model was proposed for pile caps in a triangular pattern, in which the crown of the upper boundary was approximately 1.4 times the clear spacing of pile caps. Inclusion of geosynthetic reinforcement reduced the soil arching effect but increased the total load carried by the piles. For the case with three geosynthetic layers, the lower layer had a significant effect on load transfer than the middle and upper layers, but each layer had an almost proportional effect on mitigating the differential settlement on the top of the gravel cushion. The maximum strains in the reinforcement concentrated on the geosynthetic strips bridging over two adjacent square cap corners. |
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| Keywords: | Geosynthetics Pile-supported embankment Load transfer Soil arching Triangular pattern Numerical analysis |
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