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Studies on Bearing Characteristic of Open-Ended and Close-Ended Pipe Piles under High-Speed Railway Loadings

Institute of Civil Engineering, Qingdao University of Technology, Qingdao 266033, P. R. China

Hydraulic Engineering Post-doctoral, Scientific Research Station, Zhejiang University, Hangzhou 310058, P. R. China

Research Center of Coastal and Urban, Geotechnical Engineering, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, P. R. China

E-mail Address: guoz@zju.edu.cn

Corresponding author.

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Xianzhang Ling

Institute of Civil Engineering, Qingdao University of Technology, Qingdao 266033, P. R. China

School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, P. R. China

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Xiuxia Yu

Institute of Civil Engineering, Qingdao University of Technology, Qingdao 266033, P. R. China

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, and

Na Zhu

Institute of Civil Engineering, Qingdao University of Technology, Qingdao 266033, P. R. China

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https://doi.org/10.1142/S0219455421400010Cited by:7 (Source: Crossref)

This article is part of the issue:

Special Issue on Safety Assessment of High-Speed Rail Systems
Guest Editors: Wei Guo, Zhiwu Yu and Quan Gu

Abstract

The pile foundation under a high-speed railway (HSR) not only bears the self-weight of the superstructure, but also bears a long-term vertical periodic load during its service. In this study, a large-scale vertical dynamic load test and particle flow numerical simulation method were adopted to investigate the axial cyclic performances of open piles in sand. The results from the dynamic test show that under a dynamic load with cyclic load ratios of 0.1 and 0.2, the surface displacement of the pile decays rapidly as the pile distance increases. Moreover, the higher the vibration amplitude and frequency, the larger the surface displacement. The influence range of the soil around the pile is approximately six times of the pile diameter. It is also found that the external frictional resistance of the upper part of the pile decreases, whereas that of the middle part increases. In addition, the internal friction resistance of the lower part of the pile decreases and gradually stabilizes after approximately 200 cycles. The simulation results show that the influence range of the pile on the surrounding soil is approximately 5–8 times the diameter of the pile under the action of dynamic loading; the vertical displacement of the pile mainly occurs at the beginning of the cycles. The total settlement of the pile foundation increases with an increase in the cyclic load ratio. With an increase in the cycle period, the friction resistance values on the outside of the pile and middle part significantly decrease and increase, respectively. After 10 cycles, the resistance gradually stabilizes, and no evident changes in the internal friction resistance of the pile are observed.

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