Analyses on Soil Displacement Field Caused by Pressin Process of Pile Model Tests

Abstract:

Base on the digital image correlation (DIC) technique, soil displacements and corresponding earth pressures induced by pressin process of pile model tests were studied. In the model tests, the vertical accumulative soil displacements were tracked without marks. The soil displacement trajectories were plotted, which revelated that pile pressin process caused different soil displacement paths at different depths and locations. Through joint analysis on the vertical displacements of soils around the pile and the corresponding earth pressure, the mechanism of earth pressure change was explained from the perspective of soil deformation. It shows that the displacement and earth pressure induced by advance of pile were conjugative. Finally, the influence of pressin velocity on soil displacements was investigated. The analyses presented in this study tended to further clarify the squeezing effect caused by pile pressin process and the mechanism of the development of earth pressures around the pile.

Key words:jacked pile; digital image correlation(DIC) technology; punching process; compacting displacement field; mechanism of soil pressure changes