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Geomechanics and Engineering Volume 21, Number 5, June10 2020 , pages 489-501 DOI: https://doi.org/10.12989/gae.2020.21.5.489 |
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Numerical simulation of set-up around shaft of XCC pile in clay |
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Fei Liu, Jiangtao Yi, Po Cheng and Kai Yao
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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. | ||
| Key Words | ||
| XCC pile; coupled effective stress analysis; large deformation; time-dependent strength; pile shaft resistance | ||
| Address | ||
| Fei Liu, Jiangtao Yi and Po Cheng: School of Civil Engineering, Chongqing University, No.83 Shabei Street, Chongqing, 400045, China Kai Yao: 1.) School of Qilu Transportation, Shandong University, 12550 East Second Ring Road, Jinan, 250002, China 2.) Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, Singapore, 117576, Singapore | ||