Volume 24 Issue 6
Dec.  2024
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FENG Zhong-ju, XU Bo-xi, DONG Jian-song, ZHANG Cong, LIU Xu-zhao, LAI De-jin. Seismic performance of large-diameter and variable cross-section pile group foundation in earthquake-induced subsidence sites[J]. Journal of Traffic and Transportation Engineering, 2024, 24(6): 80-91. doi: 10.19818/j.cnki.1671-1637.2024.06.005
Citation: FENG Zhong-ju, XU Bo-xi, DONG Jian-song, ZHANG Cong, LIU Xu-zhao, LAI De-jin. Seismic performance of large-diameter and variable cross-section pile group foundation in earthquake-induced subsidence sites[J]. Journal of Traffic and Transportation Engineering, 2024, 24(6): 80-91. doi: 10.19818/j.cnki.1671-1637.2024.06.005
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Seismic performance of large-diameter and variable cross-section pile group foundation in earthquake-induced subsidence sites

doi: 10.19818/j.cnki.1671-1637.2024.06.005
  • 1.

    School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China

  • 2.

    Fujian Traffic Construction Quality and Safety Center, Fuzhou 350001, Fujian, China

  • 3.

    Xiamen Road and Bridge Engineering Investment Development Co., Ltd., Xiamen 361016, Fujian, China

Funds:

National Natural Science Foundation of China 4190070568

Fujian Provincial Transportation Science and Technology Project JXFZ2020-XM0189

More Information
  • Author Bio:

    FENG Zhong-ju(1965-), male, professor, PhD, ysf@gl.gfscw.cn

  • Received Date: 2024-07-13
  • Publish Date: 2024-12-25
    Abstract
  • The model test on shaking table was used to select synthetic 5010 waves with different ground motion intensities. The effect of different ground motion intensities on the seismic performance of pile group foundation was studied. The differences in dynamic responses of horizontal displacement of pile top, bending moment of pile body, and pile foundation damage between single pile and pile group foundations under different ground motion intensities were compared. Research results indicate that under different ground motion intensities, pile group foundation is more stable than single pile foundation and less disturbed by seismic waves. The peak horizontal displacement of pile top of pile group foundation is significantly smaller than that of single pile, and the difference increases with the increase in ground motion intensity, with a maximum of 1.15 mm. Moreover, the peak horizontal displacement of pile top of pile group foundation occurs later than that of single pile. The bending moment change of pile group foundation along the pile body is the same as that of single pile, which increases first and then decreases. The difference in mechanical properties between silty soil layer and non-silty soil layer is more obvious due to earthquake-induced subsidence, so the peak value reaches at the interface of silty soil layer. The peak bending moments of pile body of pile group foundation under different ground motion intensities are smaller than those of single pile foundation, and the maximum difference is 13.02 kN·m. The peak bending moment of pile body of pile group foundation occurs later than that of single pile foundation. It can be concluded that there is a significant difference in the dynamic response between pile group foundation and single pile foundation under different ground motion intensities. The ground motion intensity that pile group foundation can withstand when damage occurs 0.35g, while that for single pile is 0.30g. The fundamental frequency drop of pile group foundation is 27.23%, while that of single pile is 33.46%. It indicates that earthquake-induced subsidence site has less influence on the fundamental frequency of pile group foundation, and pile group foundation can withstand greater ground motion intensity without damage. In summary, the seismic performance of pile group foundation is better than that of single pile in earthquake-induced subsidence sites. In engineering practice, the seismic performance of pile foundation can be improved by considering pile group effect and reasonable design of pile type.

     

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