Geomechanics and Engineering

Techno-Press (테크노프레스)
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Numerical simulation of set-up around shaft of XCC pile in clay

  • Liu, Fei (School of Civil Engineering, Chongqing University) ;
  • Yi, Jiangtao (School of Civil Engineering, Chongqing University) ;
  • Cheng, Po (School of Civil Engineering, Chongqing University) ;
  • Yao, Kai (School of Qilu Transportation, Shandong University)
  • Received : 2020.03.14
  • Accepted : 2020.04.24
  • Published : 2020.06.10
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Abstract

This paper conducts a complicated coupled effective stress analysis of X-section-in-place concrete (XCC) pile installation and consolidation processes using the dual-stage Eulerian-Lagrangian (DSEL) technique incorporating the modified Cam-clay model. The numerical model is verified by centrifuge data and field test results. The main objective of this study is to investigate the shape effect of XCC pile cross-section on radial total stress, excess pore pressure and time-dependent strength. The discrepancies of the penetration mechanism and set-up effects on pile shaft resistance between the XCC pile and circular pile are discussed. Particular attention is placed on the time-dependent strength around the XCC pile shaft. The results show that soil strength improved more significantly close to the flat side compared with the concave side. Additionally, the computed ultimate shaft resistance of XCC pile incorporating set-up effects is 1.45 times that of the circular pile. The present findings are likely helpful in facilitating the incorporation of set-up effects into XCC pile design practices.

Keywords

Acknowledgement

The authors wish to express their thanks to the very competent reviewers for the valuable comments and suggestions. The research described in this paper was financially supported by the Natural Science Foundation of China (Grant/Award Numbers: 51778091), the graduate scientific research and innovation foundation of Chongqing, China (Grant/Award Numbers: CYS18023).

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