Experimental Analysis of Compaction Effect of Single Pile Jacked in Layered Ground

Abstract:

The experimental analysis of single pile jacked in layered ground is conducted to study the behavior of compaction effect during the pile pressing process.Through comparison and analysis of displacement field of different uniform soft and hard ground during pile penetration,the different displacement modes of soil located on different positions are obtained.Moreover,the tests reveal the soil displacement behavior produced by different positioning and the depth of the pile,especially at layered soil interfaces.The experimental results show that a lag effect existed between the maximum displacement and the pressed pile depth in the uniform ground.And,the maximum radial and vertical displacements appear at the soil interface,due to the difference of soft and hard soil mechanical properties,the changing laws of displacement show mainly that the soft soil become larger,the hand soil become smaller.The experimental results allow for a better understanding of the inherent mechanism of compaction of the jacked pile during the penetration process.These results are important for estimating the influence of pile installation and guiding pile design during construction projects.

Key words:layered ground; jacked pile; penetration process; compaction effect; model test