Abstract
Settlement deformation is a major problem faced by high-speed railways, especially in soft soil subgrade areas. The geosynthetics-reinforced and pile-supported (GRPS) composite foundation is an effective design method to minimize the differential settlement between the piles and supporting soil, which can also influence the overall post-construction settlement of composite foundations. With the advantage of a short construction period and small lateral deformation, etc., the GRPS composite foundation has been widely used in both highway and railway engineering projects. However, there is no unified analysis and evaluation method for the calculation theory of the deformation of reinforced mesh cushion (RMC) in GRPS composite foundation, and the failure mode of the RMC is not adequately researched. In this paper, the deformation and failure states of reinforcement body of high-speed railway GRPS composite foundation in soft soil and the principle of deformation of RMC under different conditions are analyzed and studied with numerical analysis and simulation calculation of single piles. Secondly, through the model test, the load transfer and deformation characteristics of GRPS composite foundations are studied. The load distribution characteristics of pile body and the deformation characteristics of both pile top and bottom piercing are analyzed. The interaction characteristics and deformed failure states of RMC and pile ends are revealed, which indicated the integral deformation shapes of reinforcement body located at both pile tops and pile interval regions. The maximum stress of the reinforcement body is calculated, which is distinguished from the original suspension theory. Finally, the existing reinforcement tensile force calculation equation has been optimized and improved, which can be used for the RMC design in the GRPS composite foundation.
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Acknowledgements
This work was funded by the National Natural Science Foundation of China (Grant 41731288, U1834206), the Science and technology research and development plan of China National Railway Group Co., Ltd (Grant 2017G008-J) and the Foundation of China Academy of Railway Sciences Co., Ltd. (Grant 2020YJ048).
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Li, TF. et al. (2022). Study of Deformation and Failure States of Reinforced Mesh Cushion in the Geosynthetics-Reinforced and Pile-Supported Structure of High-Speed Railway. In: Tutumluer, E., Nazarian, S., Al-Qadi, I., Qamhia, I.I. (eds) Advances in Transportation Geotechnics IV. Lecture Notes in Civil Engineering, vol 164. Springer, Cham. https://doi.org/10.1007/978-3-030-77230-7_22
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DOI: https://doi.org/10.1007/978-3-030-77230-7_22
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