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Chuang Zhao


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Journal of Zhejiang University SCIENCE A 2021 Vol.22 No.4 P.277-295


Pile foundation of high-speed railway undergoing repeated groundwater reductions

Author(s):  Xue-cheng Bian, Lei Fu, Chuang Zhao, Yun-min Chen

Affiliation(s):  MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China

Corresponding email(s):   zhaochuang@zju.edu.cn

Key Words:  High-speed railway, Pile foundation settlement, Centrifuge testing, Numerical modelling, Groundwater declining, Drag load

Xue-cheng Bian, Lei Fu, Chuang Zhao, Yun-min Chen. Pile foundation of high-speed railway undergoing repeated groundwater reductions[J]. Journal of Zhejiang University Science A, 2021, 22(4): 277-295.

@article{title="Pile foundation of high-speed railway undergoing repeated groundwater reductions",
author="Xue-cheng Bian, Lei Fu, Chuang Zhao, Yun-min Chen",
journal="Journal of Zhejiang University Science A",
publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Pile foundation of high-speed railway undergoing repeated groundwater reductions
%A Xue-cheng Bian
%A Lei Fu
%A Chuang Zhao
%A Yun-min Chen
%J Journal of Zhejiang University SCIENCE A
%V 22
%N 4
%P 277-295
%@ 1673-565X
%D 2021
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2000235

T1 - Pile foundation of high-speed railway undergoing repeated groundwater reductions
A1 - Xue-cheng Bian
A1 - Lei Fu
A1 - Chuang Zhao
A1 - Yun-min Chen
J0 - Journal of Zhejiang University Science A
VL - 22
IS - 4
SP - 277
EP - 295
%@ 1673-565X
Y1 - 2021
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2000235

Long-pile groups of railway foundation undergo excessive settlements after groundwater reductions, which may exceed the settlement limit and threaten the safe operation of high-speed trains. However, the effect of groundwater reduction on a long-pile group (greater than 20 m in length) has not been fully understood, especially in respect of repeated reductions. In this study, a centrifuge test was conducted to investigate the responses of pile groups in silty soils subjected to repeated falls in the water table. The behavior of the piles was discussed based both on the test and on 3D numerical analyses. With the derived coefficient β for the axial force evaluation of the pile, the effect of lowering the water table on the railway pile foundation could be seen. Results of the tests and numerical analyses indicated that the water table decline significantly increased the down-drag and axial force of the pile, causing significant settlement. A longer pile presented a larger axial force at the neutral point. Nevertheless, the incremental percentage of the axial force decreased with increasing pile length with the same water table reduction. Because of group effect, the displacement of soil next to the center pile was smaller than that near the corner piles and showed a similar trend as the axial force of the pile. As the water table fell, the static load ratio affecting the progress of pile settlement increased disadvantageously, possibly inducing excessive pile settlement. A design method for railway pile foundations taking account of lowering groundwater was proposed with an example application, which provided a reference for similar projects.


创新点:1. 通过离心模型试验和数值模拟,重现地下水位下降过程中不同长度桩基的力学响应;2. 获得了桩-土相互作用及桩轴力计算参数β随水位下降的发展规律;3. 通过实际工程案例分析,提出了考虑地下水位下降的桩基设计方法.
方法:1. 通过离心模型试验和自主研发的水位控制系统研究地下水位下降对不同长度桩基的影响;2. 结合数值模拟,分析桩基沉降、轴力、摩阻力、群桩效应、参数β等随水位下降的发展规律;3. 通过实际工程案例,分析地下水位下降对高速铁路桩基沉降发展的影响,并提出考虑地下水位下降的桩基设计方法.
结论:1. 地下水位下降会增大桩-土差异沉降,引起摩阻力增长,从而造成桩基下沉.2. 桩中性点位置对水位下降不敏感;当水位下降幅值相同时,桩长越长,桩身轴力越大,但轴力增长比呈下降趋势.3. 在列车荷载下水位下降不仅会因固结效应增加桩基沉降,还通过增加桩摩阻力改变桩基沉降发展模式.4. 在列车循环荷载下,为使桩基沉降发展收敛,桩基承载力须增大60.9%以抵抗地下水位下降2 m的影响.


Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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