Research And Application On Vertical Bearing Capacity Of Prestressed Concrete Pipe Piles In Handan

The Prestress High Concrete Pile (PHC) was used in Handan city since2006, during just five years; it has been occupied more than40%of the engineering foundation treatment works in Handan. With the corresponding, the solution of the vertical ultimate bearing capacity of the single pile is limited and the static load test is not universal. So we need urgently to work out the local formula in Handan, at the same time, it will become more simple and accurate method to calculate vertical ultimate bearing capacity of single pile. In this paper, we collect the static load test data of the vertical ultimate bearing capacity of the single pile of PHC Piles for the last five years in the field of Handan. With the mathematical statistics and the numerical simulation method, we reach the following results.(1)We get the ultimate bearing capacity of the single pile by the statistical analysis of the region measured static pile load test data, according to1Stopt that it is the analysis software of mathematical optimization to the hyperbolic fitting with the Q-S curve of the single piles which are not up to the limits of destruction. At the same time, it is simulated with the FLAC3D simulation software, and it is feasible to the simulation on the curve fitting with the single pile local loading test of the PHC pile taking advantage of the mathematical statistics and the numerical simulation.(2)Statistical induction of15single pile static load test date on the local, with the "Construction of Pile Foundation Technical Specifications" as a basis, analysis of the difference is the reason. It is checked and fixed to the empirical formula of the vertical bearing capacity of single pile in the "Norms".(3)Analyze the relationship between the construction of the final pressure and ultimate bearing capacity, a preliminary study of the local static pressure pile piling comprehensive coefficient a1.It has a certain regional that the result of the simulation method and the correction factor.so it has a certain reference value to the preliminary design and the construction of the PHC pile in the corresponding area of Handan.