Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (5): 1625-1634.doi: 10.16285/j.rsm.2019.5723

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Experimental study of single pile–soil interaction under horizontal low-cycle reciprocating displacement

HUANG Fu-yun1, CHEN Han-lun1, 2, DONG Rui1, SHAN Yu-lin1   

  1. 1. Fujian Key Laboratory of Engineering Structure, College of Civil Engineering, Fuzhou University, Fuzhou, Fujian 350108, China 2. Fuzhou Urban and Rural Construction Development Co. Ltd, Fuzhou, Fujian 350007, China
  • Online:2020-05-27 Published:2020-10-13
  • Contact: CHEN Han-lun, male, born in 1994, Master, specialized in the jointless bridges and basic engineering. E-mail:
  • About author:HUANG fu-yun, male, born in 1979, PhD, Professor, Doctoral tutor, research interests: jointless bridges.
  • Supported by:
    the National Natural Science Foundation of China(51578161), Fujian New Century Talents Program(50011504) and the Project of Fuzhou Science and Technology (2018-G-63).

Abstract: To ensure better horizontal deformation resistance, the pile foundation of integral abutment jointless bridges (IAJBs) should be designed as flexible pile. However, the calculation algorithm of flexible pile in relevant codes in China is mainly applied to the laterally loaded pile, and whether it can be used to identify the flexible pile for IAJBs remains a tricky issue to be studied. Therefore, in order to study the aseismic performance and interaction mechanism of the single pile–soil system, three concrete model piles with different lengths were tested under horizontal low-cycle reciprocating displacement based on a specially designed pile deformation measurement method. The result shows that the earliest cracking position of concrete pile is between 3–6 times of pile diameter. The deeper the pile is buried, the better the effect of pile–soil interaction with a deeper location of the deformation characteristic point. Meanwhile, stiffness of pile–soil system, horizontal ultimate bearing capacity and aseismic performance is improved with burial depth increased. The result also indicates that, when the pile–soil system reach the elastoplastic stage, the flexible performance of the pile will gradually degenerate from the elastic pile to the rigid pile. Furthermore, the provisions in relevant codes in China are not safe enough when evaluating the flexural performance of the pile foundation of integral abutment jointless bridges. Hence, it is recommended to use the Broms method for the benchmarking calculation in practical engineering.

Key words: flexible pile, transverse stiffness coefficient, depth coefficient, flexural performance, horizontal reciprocating displacement