Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (12): 3942-3954.doi: 10.13229/j.cnki.jdxbgxb.20240469

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Experimental on bearing characteristics of short and long pile foundation in loess area under submerged condition

Tian-zhong MA1,2,3(),Jia-jun Yang1,2,3,Zheng-zhen WANG1,2,3(),Zhang-jia CHEN1,2,3,Bao-wen GUO1,2,3   

  1. 1.School of Civil Engineering，Lanzhou University of Technology，Lanzhou 730050，China
    2.Key Laboratory of Disaster Mitigation in Civil Engineering of Gansu Province，Lanzhou University of Technology，Lanzhou 730050，China
    3.Engineering Research Center for Disaster Prevention and Mitigation of Western Civil Engineering，Ministry of Education，Lanzhou University of Technology，Lanzhou 730050，China
  • Received:2024-04-30 Online:2025-12-01 Published:2026-02-03
  • Contact: Zheng-zhen WANG E-mail:matz0914@163.com;wangzz@lut.edu.cn

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Abstract:

To deepen the research on the mechanisms of foundation and inundation， the effect of inundation on the bearing characteristics of long and short pile foundations in loess areas was explored through modeling tests. Sixteen combined piles （8 long and 8 short） were adopted in the test， and the wet subsidence deformation was comprehensively analyzed， pile bearing capacity and deformation characteristics under the conditions of vertical load and water immersion. The results show that the Q-s curve of the long and short pile foundation under vertical load and water immersion shows a typical slow-varying curve， and the settlement of the pile end gradually increases with the increase of water immersion and load. Water immersion intensifies the deformation of the wetted soil layer around the pile， and the wetted deformation is slowed down then sharply and then slowed down again， and the increase of the wetted depth leads to the development of pile lateral friction and the downward shift of the neutral point. After 10 days of water immersion， the maximum value of negative friction resistance of long pile is 61.27 kPa， and that of short pile is 53.85 kPa. When immersed in water， in terms of the speed of negative friction resistance reduction and the range of change of the depth of the neutral point， both are the most significant side piles， and the center piles and corner piles are close to each other； the maximum negative friction resistance occurs in the corner piles， and the center piles are second， and the side piles are the last. The maximum negative friction resistance occurs in the corner pile， followed by the center pile and the last one in the side pile. After the soil body is saturated， the neutral depth ratio of the long pile （side pile） is 0.55， the neutral depth ratio of the corner pile and the center pile is 0.64， and that of the short pile is in the range of 0.62-0.64， which is close to the recommended value of the pile foundation specification. Finally， the finite element simulation experiment simulated the water immersion test through the hydraulic equivalence principle， and the results were consistent with indoor tests， indicating the reliability of the experiment.

Key words: civil engineering, long-short composite pile, skin friction of pile, neutral point, finite element simulation

CLC Number: 

  • TU473

Fig.1

Layout of test piles （mm）"

Fig.2

Schematic diagram of layout of model test"

Fig.3

Schematic diagram of strain gauge layout of model pile"

Fig.4

Schematic diagram of sieve soil and pile positioning"

Fig.5

Schematic diagram of the test setup"

Fig.6

Collapsible amount over time"

Fig.7

Settlement curve of pile foundation load before flooding"

Fig.8

Relationship between settlement of pile top and time of water immersion"

Fig.9

Axial force distribution curves of long and short pile foundations before flooding"

Fig.10

Lateral friction distribution curves of long and short pile foundations before flooding"

Fig.11

Axial force distribution curve of long piles of long and short pile foundations after flooding"

Fig.12

Lateral friction resistance distribution curve of long and short pile foundation long piles after immersion"

Fig.13

Axial force distribution curve of long and short pile foundation short pile after flooding"

Fig.14

Lateral friction resistance distribution curve of long and short pile foundation short pile after immersion"

Table1

Material parameters"

类型弹性模量/MPa泊松比摩擦角/（°）黏聚力/kPa含水量/%
承台3×1040.30———
桩3×1040.34———
土体7.80.4425.515.613.0

Fig.15

Pile meshing diagram"

Fig.16

Model boundary condition diagram"

Fig.17

Comparison of the cumulative settlement and water immersion time curve of the pile top"

Fig.18

Comparison diagram of axial force of long and short pile foundations"

Fig.19

Comparison diagram of lateral friction resistance of long and short pile foundations"

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