Soil squeezing effect of jacked pile in layered ground by visualization experiment
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.
jacked pilelayered soilsearth squeezing effectvisual model testparticle image velocimetry tech-nique
国家科技期刊平台
NSTL
万方数据
维普
