[Purposes] Addressing the technical challenges in the assembly construction of pile-slab embankment structures, particularly the difficulty in driving precast concrete (PC) piles through harder soil layers using traditional hammering methods, is crucial for enhancing the efficiency and quality of highway construction. This study focuses on the pile-slab embankment project of Luoshan to Henan-Hubei boundary section of Anluo Expressway. The aim is to explore and validate the feasibility and practical application value of the implanted PC pile technique. [Methods] Utilizing field load tests as the primary means, this study conducted a comprehensive and in-depth comparative analysis of the working behaviors of implanted PC piles and directly hammered PC piles. Additionally, numerical simulations were employed to delve into the influencing factors of the bearing capacity of implanted PC piles. [Findings] The test results revealed that the composite mortar layer surrounding the core pile can effectively transfer the load of the internal core pile to the surrounding soil layer, exhibiting significant diameter expansion and enhancement effects. The interaction between inner PC pile and outer composite mortar is obvious. As the pile depth increases, the axial force of the inner PC piles gradually decreases, while the axial force of the surrounding mortar exhibits a trend of first increases and then decreases. Furthermore, increasing the thickness and strength of the surrounding composite mortar contributes to further enhancing the overall bearing capacity of the implanted piles. [Conclusions] Under the same prefabricated pile conditions, the bearing behavior of implanted PC pile is superior to that of traditional directly driven prefabricated piles. This technique not only improves construction quality but also enhances the bearing capacity and stability of the pile bodies. It provides a new technical pathway and solution for the assembly construction of pile-slab embankment structures. This study contributes to advancing the technology and practice of highway construction, offering potential benefits for future infrastructure projects.