Discussion on Design of PHC Short Pile Foundation with Pile Length of 6~8m

Due to the uneven change of geological conditions, short piles with a pile length of 6~8m often occur in PHC pipe pile foundations.At present, the current relevant national regulations do not stipulate the minimum pile length, and there is no clear design basis and method.The characteristic value Ra of the bearing capacity of a single pile was calculated by using the calculation formulas of pile foundation and pier foundation for PHC short piles, and the calculation results of Ra were compared and analyzed by combining with the vertical compressive static load test of single pile.The results show that the calculation formula of pile foundation is relatively accurate, and the Ra test of PHC short pile can meet the design requirements, and the settlement deformation of PHC short pile can meet the requirements of the specification.The overall stability of the PHC short pile foundation in the foundation where the embedded depth of the pile foundation and the depth of the pile bottom rock meet the requirements of the specification and there is no weak substratum under the bearing layer at the bottom of the pile, and the PHC short pile foundation is safe and reliable.