doi:10.16186/j.cnki.1673-9787.2022120033

Received:2022-12-13

Revised:2023-03-21

Online Date: 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