To overcome the squeezing effect of pipe pile construction

a drilling with a prestressed concrete (DPC) pipe pile with drilling into hole

synchronous sinking pile and post-grouting was developed. It was a type of the rock-socketed and non-squeezed pipe pile. In this paper

the deformation and pressure change in the soil around the pile

caused by the drilling unloading and side post-grouting

were tested by in-situ tests. Based on test results

the change rules of unloading and grouting effects along the horizontal and vertical directions were analyzed

revealing the disturbances of soil around the pile. Moreover

a method for estimating the disturbances of DPC pipe pile construction was developed based on the circular hole shrinkage theory. The study shows that the disturbances mainly manifests unloading and grouting effects. Drilling unloading causes a shrinkage of the hole wall of 3.5−18.9 mm

and subsequent pile side post-grouting restore the shrinkage deformation by 28% to 50%

partially eliminating the impact of drilling unloading effect. In addition

the deformation and pressure change of soil around the pile caused by drilling unloading can be estimated by the modified circular hole shrinkage theory. Compared with the squeezing effect of displacement piles

the unloading effect of DPC pipe piles is significantly smaller

more advantages in application in urban areas with dense buildings and pipelines.