Research on calculation method of compressive bearing capacity of pre-bored grouted planted pile in soft soil area

As a kind of green and environmental-friendly embedded pile, pre-bored grouted planted (PGP) pile has been successfully applied in the eastern coastal soft soil area of China in recent years. However, there are different standards for the selection of pile diameter in the calculation of shaft resistance in the current codes for different types of implanted piles. In addition, the values of ultimate shaft resistance and ultimate tip resistance of implanted piles are mainly modified according to the parameters of precast piles, and there are few studies on the values of modification coefficients. Based on the load transfer mechanism of PGP pile, the value of pile diameter in the calculation of shaft resistance is analyzed according to the static load test data of six groups of PGP pile. Based on 33 groups of static load test data of PGP piles, the correction coefficient of end resistance of enlarged head of PGP piles is calculated. Finally, the rationality of the proposed formula and the recommended parameters for calculating the bearing capacity of PGP piles is verified by 30 groups of field test data. The research results can provide a theoretical basis for the design and engineering application of embedded piles such as PGP piles.