Research on simplified calculation of settlement of cast-in-situ concrete thin-wall pipe pile composite foundation

The cast-in-situ concrete thin-wall pipe pile (PCC pile) is a kind of rigid pile applied mainly to soft foundation treatment. Based on the working performance and mutual influence of the system of PCC pile-soil-cushion, PCC pile composite foundation is discussed in elastic method. A new calculation method of composite modulus of the PCC pile composite foundation is developed. Furthermore, pile-soil stress ratio and settlement can be derived from the proposed method. And it is proved that the method is practicable and applicable in the field by a practical engineering.