Geomechanics and Engineering

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Settlement behavior and controlling effectiveness of two types of rigid pile structure embankments in high-speed railways

  • Wang, Changdan (Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University) ;
  • Zhou, Shunhua (Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University) ;
  • Wang, Binglong (Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University) ;
  • Guo, Peijun (Department of Civil Engineering, McMaster University) ;
  • Su, Hui (Department of Civil Engineering, McMaster University)
  • Received : 2015.08.09
  • Accepted : 2016.08.25
  • Published : 2016.12.12
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Abstract

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 post-construction 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.

Keywords

Acknowledgement

Supported by : National Natural Science Funds Fund of China, Central Universities of China

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