In-Situ Test And Numerical Simulation Of Horizontal Bearing Capacity On Prestressed Concrete Pipe Pile

Prestressed concrete pipe pile is a kind of reinforced concrete precast pile combining pretensioned prestressing technique and rotational molding method. According to strength grade of pile body concrete they can be divided into two categories, one is prestressed concrete pipe pile (PC pile, the strength grade of pile body concrete not less than C50), the other is prestressed high strength concrete pipe pile (PHC pile, the strength grade of pile body concrete not less than C80).Since their advent, prestressed concrete pipe piles have been applied widely in domestic and overseas engineering construction field because of their numerous advantages, such as low cost, reliable quality, high bearing capacity and short construction period. However, in most cases they were used as vertical bearing piles, their horizontal bearing behavior was rarely researched; their theoretical studies are still far behind the engineering practice, it's design method still depends on engineering experience to a large extent. So it is necessary to implement further exploration on the horizontal bearing capacity of prestressed concrete pipe piles.Based on domestic and overseas research methods and results of prestressed concrete pipe piles, this paper brings in a practical case and introduces the method to determine horizontal bearing capacity ultimate value and eigenvalue of engineering pile by in-situ test, then simulates the pile-soil interaction of horizontal loaded single pile by the large-scale finite element analysis software ANSYS, researching the bearing capability and deformation behavior of horizontal loaded prestressed concrete pipe pile. Following conclusions are drawn:1. Under the same lateral load, when pile length increases the pile body horizontal bearing capacity of prestressed concrete pipe pile does not change significantly, but the working extent gradually decreases. It shows that in practical project pile body length just needs to meet the design requirements, there is no big significance to keep increasing the pile length.2. Elastic moduluses of pile body and soil are principal elements affecting horizontal bearing behavior of prestressed concrete pipe pile. Greater pile body elastic modulus could increase pile body horizontal interior force and decrease pile body horizontal displacement to something extent; with soil elastic modulus diminishing, the working extent of bottom pile body gradually increases, horizontal load sharing function of pipe pile is more obvious.3. With horizontal load value increasing, horizontal displacement and interior force of prestressed concrete pipe pile also increase and the variation tendency gradually trend to nonlinearity.4. By means of adding fill core, pile body stiffness of stressed section could be increased obviously; pile body horizontal displacement and interior force could be decreased.5. Properly increasing the thickness of prestressed concrete pipe pile can improve the pile body stiffness and control pile-top horizontal displacement and pile body horizontal interior force.6. For the prestressed concrete pipe pile carrying horizontal load, vertical load has a little effect on pile body horizontal bearing capacity, but it can control the tensile stress on pile body to something extent.