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FENG Zhong-ju, WANG Xi-qing, LI Xiao-xiong, HU Ming-hua, YUAN Feng-bin, YIN Hong-hua, DONG Yun-xiu. Effect of sand liquefaction on mechanical properties of pile foundation under strong earthquake[J]. Journal of Traffic and Transportation Engineering, 2019, 19(1): 71-84. doi: 10.19818/j.cnki.1671-1637.2019.01.008
Citation: FENG Zhong-ju, WANG Xi-qing, LI Xiao-xiong, HU Ming-hua, YUAN Feng-bin, YIN Hong-hua, DONG Yun-xiu. Effect of sand liquefaction on mechanical properties of pile foundation under strong earthquake[J]. Journal of Traffic and Transportation Engineering, 2019, 19(1): 71-84. doi: 10.19818/j.cnki.1671-1637.2019.01.008
shu

Effect of sand liquefaction on mechanical properties of pile foundation under strong earthquake

doi: 10.19818/j.cnki.1671-1637.2019.01.008
  • 1.

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

  • 2.

    School of Geographic Information and Tourism, Chuzhou University, Chuzhou 239000, Anhui, China

  • 3.

    Anhui Transport Consulting and Design Institute Co., Ltd., Hefei 230088, Anhui, China

  • 4.

    China Highway Engineering Consultants Corporation, Beijing 100089, China

  • 5.

    Guangdong Communication Planning and Design Institute Co., Ltd., Guangzhou 510507, Guangdong, China

More Information
  • Author Bio:

    FENG Zhong-ju (1965-), male, professor, PhD, E-mail: ysf@gl.chd.edu.cn

    WANG Xi-qing(1990-), female, engineer, doctoral student, xiqingc@hotmail.com

  • Received Date: 2018-08-03
  • Publish Date: 2019-02-25
    Abstract
  • In order to improve the seismic resistance behavior of bridge pile foundation located at the liquefied layer, the shaking table model test with three directions and six degrees of freedom was carried out, the dynamic responses of pile tops' horizontal displacements and piles' accelerations and bending moments were analyzed under the seismic waves, and the damages of pile foundations under the actions of seismic waves were studied. Experiment result shows that, under the actions of seismic waves, the lateral expansion effect gradually decreases with the increase of the depth of liquified layer. Therefore, the peak horizontal displacement of pile top gradually decreases. However, the peak horizontal displacement of pile top will no longer be affected by the liquefied layer depth when the seismic acceleration exceeds 0.6g. The pile accelerations increase significantly in the fine sand layer because of the liquefaction of fine sand layer under the seismic loads. The stress caused by the overburden soil can enhance the shear strength of lower layer, therefore, the amplification factor of pile top increases as the depth of liquefied layer increases. Moreover, the amplification factor is the largest under the action of Kobe wave, and the smallest under the action of 5002 wave. The sand liquefaction also causes the strength of soil layer to decrease, leading to the acceleration magnification in the soil layer. All the maximum bending moments of piles appear at the boundary between the liquefied layer and non-liquefied layer, and under the same seismic intensity, the maximum bending moment of pile increases with the increase of liquefaction layer depth. When the seismic acceleration increases from 0.30g to 0.35g, the bending moment of pile shows a maximum increase of 33.3%. The pile foundations experience no difference in the damages caused by different types of seismic waves. Under the acceleration of 0.35g, the fundamental frequency of pile foundation has no change. But when the seismic wave strength exceeds 0.40g, the fundamental frequency of pile foundation suddenly drops from 1.65 Hz to 0.45 Hz. The pile foundations in the sand layer laterally displace due to the liquefaction, and the piles deform due to the shear stress, eventually leading to the damages of pile foundations. In conclusion, when the liquefied layer is relatively shallow, the excessive horizontal displacements of pile tops under the actions of seismic waves should be fully considered. In the seismic design of pile foundation, the bending resistance of pile foundation at the boundary between the liquefied and non-liquefied layer, and the liquefied layer depth must be considered.

     

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    • References(33)
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