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Shock and Vibration
Volume 2017 (2017), Article ID 2431813, 9 pages
https://doi.org/10.1155/2017/2431813
Research Article

Experimental Study on the Behavior of X-Section Pile Subjected to Cyclic Axial Load in Sand

1School of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China
2Key Lab of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China
3School of Civil, Environmental and Mining Engineering, The University of Western Australia, Perth, WA 6009, Australia
4School of Civil Engineering, Chongqing University, Chongqing 400045, China

Correspondence should be addressed to Yiwei Lu; moc.361@nciewiyul

Received 13 August 2017; Revised 19 November 2017; Accepted 4 December 2017; Published 19 December 2017

Academic Editor: Lutz Auersch

Copyright © 2017 Yiwei Lu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

X-section cast-in-place concrete pile is a new type of foundation reinforcement technique featured by the X-shaped cross-section. Compared with a traditional circular pile, an X-section pile with the same cross-sectional area has larger side resistance due to its larger cross-sectional perimeter. The behavior of static loaded X-section pile has been extensively reported, while little attention has been paid to the dynamic characteristics of X-section pile. This paper introduced a large-scale model test for an X-section pile and a circular pile with the same cross-sectional area subjected to cyclic axial load in sand. The experimental results demonstrated that cyclic axial load contributed to the degradation of shaft friction and pile head stiffness. The dynamic responses of X-section pile were determined by loading frequency and loading amplitude. Furthermore, comparative analysis between the X-section pile and the circular pile revealed that the X-section pile can improve the shaft friction and reduce the cumulative settlement under cyclic loading. Static load test was carried out prior to the vibration tests to investigate the ultimate bearing capacity of test piles. This study was expected to provide a reasonable reference for further studies on the dynamic responses of X-section piles in practical engineering.