Squeezing effects of different piles are hot issues and important problems in engineering design and constructions. Based on the Fourth Yangtze River Bridge?s north-line soft soil treatment engineering at Nanjing

the squeezing effects of X-section cast-in-place concrete pile (referred to as XCC pile) were studied. The influence of pile construction on pore water pressure changes

earth pressure and lateral displacement are observed by pre-laying piezometers

earth pressure cells and inclinometers

respectively. Instruments are embedded at different directions and different depths. Through analyzing the data from field tests

the squeezing effects of XCC pile are obtained. The results show that the maximum horizontal displacement occurs at the top of the piles; and these displacements can be neglected when the distance exceeds five times of equivalent pile diameter. It is also shown that crowded soil pressure and pore-water pressure decreased with the increasing of center distance; besides

pressure of sharp corner is larger than that of concavity. The data from field tests provide other engineers with reliable evidences.