Volume 25 Issue 4
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ZHANG Cong, FENG Zhong-ju, PENG Jian-bing, WANG Fu-chun, WANG Xi-qing, LI Yu-ting. Seismic subsidence characteristics and negative frictional resistance of soft soil around variable cross-section single pile foundations[J]. Journal of Traffic and Transportation Engineering, 2025, 25(4): 124-134. doi: 10.19818/j.cnki.1671-1637.2025.04.009
Citation: ZHANG Cong, FENG Zhong-ju, PENG Jian-bing, WANG Fu-chun, WANG Xi-qing, LI Yu-ting. Seismic subsidence characteristics and negative frictional resistance of soft soil around variable cross-section single pile foundations[J]. Journal of Traffic and Transportation Engineering, 2025, 25(4): 124-134. doi: 10.19818/j.cnki.1671-1637.2025.04.009
shu

Seismic subsidence characteristics and negative frictional resistance of soft soil around variable cross-section single pile foundations

doi: 10.19818/j.cnki.1671-1637.2025.04.009
  • 1.

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

  • 2.

    School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710064, Shaanxi, China

  • 3.

    Baoji Administrative Service Center, Baoji 721000, Shaanxi, China

Funds:

National Natural Science Foundation of China 52378322

Shaanxi Association for Science and Technology Youth Talent Support Program 20250461

Fundamental Research Funds for the Central Universities, CHD 300102215110

Fujian Provincial Transportation Science and Technology Project 202105

More Information
  • Corresponding author: PENG Jian-bing (1953-), male, professor, academician of Chinese Academy of Sciences, PhD, dicexy_1@chd.edu.cn
  • Received Date: 2024-09-26
  • Accepted Date: 2025-04-30
  • Rev Recd Date: 2025-03-21
  • Publish Date: 2025-08-28
    Abstract
  • To clarify the dynamic response and negative frictional resistance characteristics of variable cross-section single piles in seismic subsidence sites under earthquake action, physical model tests with a large-scale shaking table were carried out with Xiang'an Bridge as the engineering background, and a dynamic interaction model of variable cross-section single piles and soft soil was established. The seismic subsidence characteristics of soil layers, pile acceleration, horizontal displacement at the pile top, and negative frictional resistance under 0.10g-0.45g 5010 wave actions were researched. A calculation formula for seismic subsidence of soil layers based on the principle of vibration consolidation and a calculation formula for negative frictional resistance comprehensively considering soft soil thickness and seismic intensity were proposed. Analysis results indicate that the seismic subsidence amount of soft soil increases with the increase of seismic wave intensity, and when the seismic wave intensity is 0.45g, the seismic subsidence amount of soft soil reaches 0.48 cm. The theoretical calculation formula of soft soil seismic subsidence based on the principle of vibration consolidation agrees well with the test results. The acceleration of variable cross-section single pile foundation gradually increases along the direction of seismic wave propagation, and an acceleration amplification effect is produced at the pile top. The amplification factor of pile top acceleration is greater than 1, and the amplification effect decreases with the increase of seismic loading intensity. Under seismic waves of the same intensity, the peak acceleration at the pile end occurs earlier than that at the variable cross-section and pile top. The horizontal displacement at the pile top of the variable cross-section single pile changes significantly in the early stage of seismic wave loading, and the amplitude gradually decreases in the later stage. The negative frictional resistance of the variable cross-section single pile occurs within the range of 0-3 times the diameter of the large-section pile below the soft soil layer, and it gradually increases with the increase of seismic wave intensity. In summary, under earthquake action, variable cross-section single piles in soft soil seismic subsidence sites are prone to negative frictional resistance effects. In engineering design, optimizing the cross-section design of pile foundations can reduce the adverse effects of negative frictional resistance on bridge pile foundations.

     

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