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Volume 47 Issue 7
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ZHANG Xiaoling, ZHANG Xiaowei, XU Chengshun. Bearing capacity of pile foundation in soft clay under cyclic loading[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(7): 1365-1372. DOI: 10.11779/CJGE20240169
Citation: ZHANG Xiaoling, ZHANG Xiaowei, XU Chengshun. Bearing capacity of pile foundation in soft clay under cyclic loading[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(7): 1365-1372. DOI: 10.11779/CJGE20240169
shu

Bearing capacity of pile foundation in soft clay under cyclic loading

  • 1.

    College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China

  • 2.

    Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China

Funds: 

the General Programof National Natural Science Foundation of China 52478324

the Key Program of National Natural Science Foundation of China 52438009

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  • Received Date: February 21, 2024
  • Revised Date: June 27, 2024
  • Accepted Date: July 15, 2024
  • Available Online: July 15, 2024
  • Published Date: July 16, 2024
    Graphical Abstract
    • Abstract
  • It is known that the strength and stiffness of soft clay will decrease with the continuous action of cyclic loading. Currently, the majority of studies on load transfer models for piles in soft clay under cyclic loading are based on the hyperbolic model, which are more complex and less efficient. In this study, a mechanical model for soils considering the cyclic weakening effects of soft clay is proposed. The secondary development of the ABAQUS subroutine is utilized to describe the cyclic weakening characteristics of soils, and the method is introduced into the calculation of the pile-soil interaction model. The conventional static load transfer model for piles is enhanced, and a trilinear model for resistance force of piles that can account for the cyclic weakening effects of soft clay is proposed. A method for calculating the bearing capacity of pile foundation is established based on the load transfer method with the cyclic weakening effects of soils. The calculated results are compared with those of the model tests, and the correctness of the proposed method considering the cyclic weakening effects of soft clay is verified. Finally, the method is applied to the calculation of the ultimate bearing capacity of pile foundation in an actual project of offshore wind power pile foundation. It is found that when the monopile foundation in soft clay is subjected to cyclic loading, the ultimate bearing capacity of the monopile will show a tendency of first fast and then slow attenuation with the increase of the number of cycles. With the increase of the cyclic loading level, the decay rate of the ultimate bearing capacity of the monopile increases, and the increase rate is from slow to fast. When the cyclic loading level exceeds a certain limit value, the decay rate of the ultimate bearing capacity increases rapidly.
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    • References (15)
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