Arching in geogrid-reinforced pile-supported embankments over silty clay of medium compressibility: Field data and analytical solution |
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| Institution: | 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. 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. 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. Deltares, Unit Geo-Engineering, P.O. Box 177, 2600 MH, Delft, Netherlands;2. Delft University of Technology, Netherlands;3. Ghent University, Belgium;1. Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China;2. Institute of Light-wave Technology, Xiamen University, Xiamen 361005, China;1. Institute of Geotechnical and Underground Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. Key Lab of Highway Construction & Maintenance Technology in Loess Region, Shanxi Transportation Research Institute, Shanxi 030000, China;1. Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Macau;2. UMacau Research Institute, Zhuhai, Guangdong, China |
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| Abstract: | The objective of this study is to improve the understanding of load transfer mechanism of Geogrid-Reinforced Pile-Supported Embankments (GRPS) via a new 3D analytical approach and comprehensive field tests. A full-scale embankment was built over a silty clay of medium compressibility as a part of the Liuzhou-to-Nanning High-speed Railway (LNHR) in China. Six sections of the embankment have been heavily instrumented producing comprehensive data of high quality. Field measurements evidence the existence of soil arching, membrane contribution and ground reaction, phenomena that are all contributing to load transfer mechanism. The new 3D analytical arching model accounts for a triangular arrangement of piles and, unlike existing methods, accounts for all relevant components of load transfer mechanisms. In addition, two key parameters were introduced in the model: an elastoplastic state parameter of soil arching (α) and a coefficient of equivalent uniform stress (β). The former was used to satisfy the load equilibrium in case of partial arching while the latter was adopted to allow possible nonuniform vertical stress acting on the ground surface. The so-called ground reaction method was incorporated in an innovative manner to take into account the reactive support of the subsoil beneath geogrid-reinforced layer when estimating the tension development in the geogrid. Finally, the performance of the proposed model was assessed against several existing models and field measurements. Results showed that the new model presented herein outperforms existing models and satisfactorily predicts both the pile efficiency and tension development within the geogrid. |
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| Keywords: | Arching effect Analytical method Load transfer Embankment Piles Field test |
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