The Study On Compacting Effect Of Prestressed Concrete Pipe Pile And The Analysis Of Measured Data

As a new type of precast concrete pile, prestressed concrete pipe pile has many advantages, such as high bearing capacity, low cost, convenient detection and better quality, so it has been widely used in civil engineering, especially all types of buildings on soft clay foundation. But as a type of soil compaction pile, it often causes negatives effects on adjacent buildings and underground pipeline. As people’quality life and environmental consciousness gradually strengthens, more and more attention has been paid on compaction effects caused by pile driving process.Based on the studies about compaction effects at home and abroad, in this paper, the following studies has been done, including:1. This paper introduced the history of development and application of prestressed concrete pile firstly and introduced and analyzed one by one in studying soil compaction both at home and abroad, especially some new research in recent years. This paper introduces construction and testing technology. Some problems that arise frequently in the application of the pipe pile are discussed, and the author gives his own points on these problems.2. This paper introduces the theory of cavity expansion. The cavity expansion theory is applied to study compaction effect of pile driving in saturated soil. The influences of soil plug rate h/L and initial radius rate R0/Ru on the radius of Plastic zone Rp and cavity expansion pressure pu are studied during pile driving in saturated soil.3. Several laws and conclusions are gained trough many measured data of displacement and excess pore water pressure from the port of Dong-jiang pipe pile driving construction. Then excess pore water pressure caused by single pile is obtained from the measured data. Then the measured data and the theoretical results are compared.4. This paper discusses the time effect of bearing capacity. The mechanism of time effect on bearing capacity is analyzed. Then the bearing capacity growth curve is done with hyperbola through the measured data. The ultimate bearing capacity from hyperbolic, static load test and soil parameters was compared.