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Geomechanics and Engineering
  Volume 11, Number 6, December 2016 , pages 847-865

Settlement behavior and controlling effectiveness of two types of rigid pile structure embankments in high-speed railways
Changdan Wang, Shunhua Zhou, Binglong Wang, Peijun Guo and Hui Su

    In this study, a series of geotechnical centrifugal tests were conducted to investigate the effectiveness of settlement control of two types of rigid pile structure embankments (PRSE) in collapsible loess under high-speed railway embankments. The research results show that ground reinforcement is required to reduce the postconstruction settlement and settlement rate of the embankments. The rigid pile structure embankments using rigid piles can substantially reduce the embankment settlement in the construction of embankments on collapsible loess, and the efficiency in settlement reduction is affected by the pile spacing. The pile-raft structure embankments (PRSE) have much stronger ability in terms of the effectiveness of settlement control, while the pile-geogrid structure embankments (PGSE) provides rapid construction as well as economic benefits. Rational range of pile spacing of PRSE and PGSE are suggested based on the requirements of various railways design speeds. Furthermore, the time effectiveness of negative skin friction of piles and the action of pile-cap setting are also investigated. The relevant measures for improving the bearing capacity and two parts of transition zone forms as positive control mean have been suggested.
Key Words
    high-speed railways; embankment engineering; rigid pile structure embankment (RPSE); centrifuge model test; settlement controlling; collapsible loess
(1) Changdan Wang, Shunhua Zhou, Binglong Wang:
Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, 4800 Cao'an Road, Shanghai, 201804 China;
(2) Peijun Guo, Hui Su:
Department of Civil Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario, L8S 4L6 Canada.

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