Abstract: The equal stiffness substitution method is often used in PRC pipe pile supporting structure analysis, but for large spaced supporting piles, the existing substitution method will lead to the calculated width of the soil resistance inconsistent with the actual conditions. It is of practical significance to find an equal stiffness substitution method for the calculation of the large spaced supporting pipe pile. This paper presents a case history of a deep excavation project in Xuzhou, Jiangsu Province. Combined with the calculation method of the soil reaction width, the stiffness of supporting pipe pile is replaced by the rectangular square pile. To highlight the advantages of this method, the case without anchor is analyzed first, and compared with the existing equal stiffness substitution method. Then, this method is applied to calculate the PRC construction method pile and prestressed anchor support condition. The comparative analysis results show that for the large spaced soldier piles, the existing equal stiffness substitution method reduces the calculated width of the soil reaction force, and its predicted deformation is too large. The equal stiffness substitution for the rectangular square piles can avoid this problem. The stiffness substitution method of the PRC pipe pile is studied in order to provide a reference for similar deep excavation problems.

Key words: Deep Excavation Projects, PRC Pipe Pile, Equivalent Stiffness Replacement, Ground Anchor