边汉亮, 马宇豪, 张建伟,等.不同桩长对GFRP复合桩竖向承载性能影响研究[J].河南理工大学学报（自然科学版）,doi:10.16186/j.cnki.1673-9787.2022120033

BIAN H L, MA Y H, ZHANG J W, et al.Effect of different pile sizes on vertical bearing capacity of GFRP composite piles[J].Journal of Henan Polytechnic University(Natural Science) , doi: 10.16186/j.cnki.1673-9787.2022120033

不同桩长对GFRP复合桩竖向承载性能影响研究(网络首发)

边汉亮1, 马宇豪1, 张建伟1, 瑜璐1, 樊亚龙2

1.河南大学 土木建筑学院，河南 开封  475004;2.中建七局第四建筑有限公司，陕西 西安  710000

摘要:为了探究不同桩长对玻璃纤维增强复合材料桩（GFRP桩）竖向承载性能的影响，开展室 内模型试验，分别对普通钢筋混凝土桩（RC桩）和GFRP复合桩的竖向承载性能进行研究，同 时利用有限元软件模拟不同桩长对其竖向承载特性的影响。结果表明.与RC桩相比，玻璃纤 维复合布与土体的摩擦系数比混凝土与土体的摩擦系数高，有利于GFRP复合桩侧摩阻力的 发挥；模型试验中，GFRP复合桩的竖向位移较RC桩减小14.4%，侧摩阻力占比增大9.4% ；对 比桩长5，10，15 m，GFRP复合桩的桩身侧摩阻力占比分别占桩基极限承载力的42.44%， 63.09%，75.69%，随着桩长的增大，GFRP复合桩桩侧厚阻力的发挥效果更好，对应的桩基极限 承载力越高，GFRP桩-土的界面摩擦特性发挥越理想。试验结果可为GFRP复合桩的竖向承 载力设计提供参考。

关键词:GFRP复合桩;竖向承载性能;模型试验;压实度;摩擦系数

中图分类号：TU473.1

doi:10.16186/j.cnki.1673-9787.2022120033

基金项目:国家自然科学基金资助项目（51508163）； 河南省研究生教育改革与质量提升工程项目（YJS2021JD13）

收稿日期:2022-12-13

修回日期:2023-03-21

网络首发日期: 2023-09-26

Effect of different pile sizes on vertical bearing capacity of GFRP composite piles(Online)

BIAN Hanliang1, MA Yuhao1, ZHANG Jianwei1, YU Lu1, FAN Yalong2

1.School of Civil Engineering and Architecture，Henan University，Kaifeng  475004，Henan，China;2.The Fourth Construction Company Ltd of China Construction Seventh Engineering Bureau，Xi'an  710000，Shaanxi，China

Abstract:To explore the influence of pile length on the vertical bearing capacity of glass fiber reinforced composite pile （GFRP composite pile）. A series of model tests were performed to investigate the vertical bearing capacity of the ordinary reinforced concrete pile （RC pile） and GFRP composite pile，respectively. At the same time，the effect of pile length was researched by the finite element analyses for the vertical bearing capacity.In this study，an advantage of the GFRP composite pile was that the friction coefficient between the GFRP composite pile and soil was higher than that between the RC pile and soil. In the model test，the vertical displacement of the GFRP composite pile decreased by 14.4% compared with the RC pile， and the proportion of side friction increased by 9.4%.For the GFRP composite pile with lengths of 5 m，10 m，and 15 m，the side friction forces accounted for 42.44%，63.09%，and 75.69% of the ultimate bearing capacity，respectively. With increasing length，the side friction of the GFRP composite pile increased，which led to the corresponding results：a higher ultimate bearing capacity in the pile foundation，and larger inter⁃face friction of GFRP composite pile-soil.The conclusions could provide some suggestions for the design of the vertical bearing capacity of GFRP composite piles.

Key words:GFRP composite pile;vertical bearing capacity;model test;compaction degree;friction coefficient

CLC：TU473.1