Experimental study of relationship between sand liquefaction and 
CFG pile construction parameters

YIN Xiao-ka; DU Si-yi; WANG Tao-tao

doi:10.16285/j.rsm.2020.1859

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Experimental study of relationship between sand liquefaction and CFG pile construction parameters

更新时间：2026-06-25

- Experimental study of relationship between sand liquefaction and CFG pile construction parameters
- Vol. 42, Issue 9, Pages: 2518-2524(2021)
- 作者机构：
  
  郑州大学土木工程学院,河南,郑州,450001
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2020.1859
  CLC： TU753.3
- Online First：30 August 2021，
  
  Published：2021
- 稿件说明：
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YIN Xiao-ka, DU Si-yi, WANG Tao-tao. Experimental study of relationship between sand liquefaction and CFG pile construction parameters[J]. 2021, 42(9): 2518-2524.
DOI：

YIN Xiao-ka, DU Si-yi, WANG Tao-tao. Experimental study of relationship between sand liquefaction and CFG pile construction parameters[J]. 2021, 42(9): 2518-2524. DOI： 10.16285/j.rsm.2020.1859.

摘要

饱和细砂液化一直阻碍长螺旋钻孔水泥粉煤灰碎石（cement fly-ash gravel，简称CFG）桩施工技术的发展。但CFG桩施工参数与饱和细砂液化的关系模型尚未得到研究。深入分析了CFG桩施工参数中桩间距l和钻杆转速? 对饱和细砂液化的影响，建立了施工参数和饱和细砂液化的关系模型。然后搭建试验平台，通过模拟饱和细砂中长螺旋钻孔CFG桩施工，分析了不同施工参数下的超孔隙水压力变化规律、饱和细砂液化现象和桩身形状。结果表明：随着转速增大和桩间距减小，饱和细砂液化加重，桩长变短，桩径变大；为减轻饱和砂土液化，应减小钻杆转速和增大桩间距。

Abstract

The liquefaction of saturated fine sand is a crucial difficulty hindering the development of long auger cement fly-ash gravel (CFG) pile construction technology. However

the relationships between liquefaction and two construction-related parameters of CFG piles

namely the pile spacing and the pipe rotation speed

during the piling process have not been well investigated. Thus

in this paper

the influences of these two parameters on the liquefaction of saturated fine sand are analyzed

and the relationships between the two parameters and liquefaction are established. Besides the theoretical studies

an experiment platform is also established to reproduce the construction process of a long auger CFG pile in the saturated fine sand. The results of laboratory tests show that the increase of pipe rotation speed and the decrease of pile spacing promote the liquefaction of saturated fine sand

shorten the pile length

and increase the pile diameter. In order to relieve the liquefaction of saturated sand

the pipe rotation speed should be reduced and the pile spacing should be increased.

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