河南城建学院学报2024，Vol.33Issue(2)：20-26,7.DOI:10.14140/j.cnki.hncjxb.2024.02.004
静压桩在成层地基中挤土效应的可视化研究
Soil squeezing effect of jacked pile in layered ground by visualization experiment
摘要
Abstract
To scrutinize the squeezing effect of a jacked pile in layered soils and its difference from homogene-ous soil,some visual model tests of static jacking pile penetration in layered soils and homogeneous soils were carried out with techniques of transparent soil and particle image velocimetry(PIV).After the images of dis-placement vector,displacement isoline of soil mass and the displacement characteristics of interface between soft and hard soil layers were analyzed,the results show:in terms of pile lateral soil displacement and surface uplift,the influence range of Jacked pile in clay foundation is larger than that in sand,but the squeezing effect of sand foundation is greater than that of clay foundation within three times of the pile diameter;compared with homogeneous clay foundation,the pile-tip compaction effect of layered ground with clay layer in upper and sand layer in lower is weakened,lateral displacement around the pile increases,and the uplift value of the ground surface increases within two times of the pile diameter,and it decreases outside two times of the pile diameter;compared with homogeneous sand foundation,the pile-tip compaction effect of layered ground with sand layer in upper and clay layer in lower is enhanced,the lateral displacement and the uplift value of the ground surface decrease within three times of the pile diameter,but the influence of surface uplift extends beyond four times of the pile diameter;the displacements of the upper and lower layers are different at the interface of layered foun-dation,the displacement difference near the pile side is significant especially.关键词
静压桩/成层地基/挤土效应/可视化模型试验/粒子图像测速技术Key words
jacked pile/layered soils/earth squeezing effect/visual model test/particle image velocimetry tech-nique分类
建筑与水利引用本文复制引用
施静怡,吴能森,刘强..静压桩在成层地基中挤土效应的可视化研究[J].河南城建学院学报,2024,33(2):20-26,7.基金项目
福建省财政厅科技专项(KLE18014A) （KLE18014A）
福建农林大学产学合作项目(KH1500590) （KH1500590）
