吉林大学学报(工学版) ›› 2017, Vol. 47 ›› Issue (4): 1075-1081.doi: 10.13229/j.cnki.jdxbgxb201704010

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Negative skin friction of pile foundation considering soil consolidation in high fill site

ZHENG Yi-feng1, MAO Jian1, LIANG Shi-zhong2, ZHENG Chuan-feng1   

  1. 1.College of Construction Engineering, Jilin University, Changchun 130026, China;
    2.Jilin Provincial Communication Planning and Design Institute, Changchun 130021, China
  • Received:2016-06-12 Online:2017-07-20 Published:2017-07-20

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Abstract: Research about the location of neutral point of negative friction in pile foundation when silty clay is backfilled is carried out at T2 terminal of Longjia Airport, Changchun. Soil settlement observation, bearing capacity test of pile foundation and numerical simulation are adopted in the research. By observation and experiment, the accumulative settlement of backfill, the relation curve and fitting formula between the soil filling load and time and the Q-S curve of a single pile, the effects of soil depth on the internal force of pile body and on the pile side negative skin friction are obtained. Finite element software, Midas, is applied to compute the settlement deformation of the pile foundation. The actually measured pile side friction is used to simulate the interaction between the pile and surrounding soil. In the experiments, the pile bottom layer soil is simulated by elastic support, and the stiffness of the spring is calculated by “m” method. The residual settlement around the pile under different consolidation time is calculated by modified Takagi Shunsuke method. The negative skin friction neutral points under different consolidation times are located by comparative analysis of the results of theoretical calculation and field experiment. Then, the settlement correction coefficient of the foundation soil in this kind of field is modified.

Key words: civil engineering construction, pile foundation, consolidation settlement, neutral point

CLC Number: 

  • TU473.1
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