Abstract: This study focuses on a factory building project in Haicang District, Xiamen City. After comprehensively analyzing the applicability of traditional bored cast-in-place concrete piles and static press-in precast concrete pipe piles in the complex geological conditions characterized by soil strata with boulders and hard residual formations, a detailed geological survey was conducted by using advanced drilling techniques tailored to each pile location. Based on the findings, a combined pile foundation design and construction scheme integrating static press-in pile driving with rotary drilling pilot hole piling was proposed. This approach enabled the successful installation of UHC high-strength concrete pipe piles in the project. The effectiveness of the method was validated through static load tests and comparative tests using high-strain and low-strain dynamic testing methods. The results demonstrate that this technique provides a technically feasible, cost-effective, and quality-assured solution for pile foundation engineering in similar complex geological conditions.

Key words: Rotary Drilling Piling, Multi-Boulder Strata, Piled Foundation, Load Test, High-Strain Dynamic Testing, Low-Strain Integrity Testing