土木与环境工程学报（中英文）2024，Vol.46Issue(6)：107-115,9.DOI:10.11835/j.issn.2096-6717.2023.039
XCC桩群桩沉桩挤土效应透明土模型试验研究
Experimental study of XCC pile group penetration effect based on transparent soil model testing technique
摘要
Abstract
X-section cast-in-place concrete pile(XCC pile),as a non-circular sectional special-shaped pile,turned the circular arch into reverse arch based on the principle of constant sectional special-shaped periphery enlargement,to turn the circular arc positive arch into an anti-arch,and finally forms a symmetrical X-shaped section,to expand the section perimeter and improve the bearing capacity.The installation process of XCC piles is actually a process of soil squeezing,and the effect of soil squeezing of pile group penetration is more complicated than that of single pile.However,there is limited research on the effect of soil squeezing of XCC piles group penetration at present,and the effect of soil squeezing of XCC pile group penetration is an important topic in the study of XCC piles.The effects of different pile types and different pile sequences on the squeezing effect of pile group penetration are studied.Based on the transparent soil technique,the penetration test of XCC pile and circular pile group was carried out.The displacement field variation pattern of pile group penetration was obtained via particle image velocimetry,and the influence of different pile types and penetration sequences on squeezing effect of pile group was studied.Results show that obvious cumulative effect and shielding effect can be observed during the penetration of XCC and circular group piles.For the displacement of the soil of the last penetrated pile dorsal surface,the displacement caused by XCC piles penetration reaches the peak first than that of the circular piles,and both XCC piles and round piles penetration produce obvious cumulative effect and shielding effect.The shielding effect of XCC pile is stronger than that of circular pile.Finally,empirical formula for predicting the shielding effect for XCC and circular piles under different penetration sequences was provided.关键词
透明土/现浇X形混凝土桩/群桩贯入/挤土效应/累积效应/遮拦效应Key words
transparent soil/cast-in-place X pile(XCC pile)/group pile penetration/penetration effect/cumulative effect/shielding effect分类
土木建筑引用本文复制引用
胡文强,周航,刘汉龙..XCC桩群桩沉桩挤土效应透明土模型试验研究[J].土木与环境工程学报（中英文）,2024,46(6):107-115,9.基金项目
国家自然科学基金(51978105) （51978105）
重庆市研究生科研创新项目(CYS22056) （CYS22056）
重庆市杰出青年科学基金(cstc2021jcyj-jqX0017)National Natural Science Foundation of China(No.51978105) （cstc2021jcyj-jqX0017）
Chongqing Graduate Student Research Innova-tion Project(No.CYS22056) （No.CYS22056）
Chongqing Science Fund for Distinguished Young Scholars(No.cstc2021jcyj-jqX0017) （No.cstc2021jcyj-jqX0017）
