It can be seen from the above that there is currently limited research on the ultimate bearing performance of pile foundations in fault zones. Pile foundations located within fault zones require sophisticated geological modeling to accurately reflect their bearing characteristics due to the complexity of their geological conditions. Therefore, this paper takes pile foundations within fault zones as the research object and uses the Xiangfan-Guangji Fault Suspension Bridge in Hubei Province as the engineering background. Triaxial compression tests were conducted on mylonite in the fault zone at the bridge site, and Mohr-Coulomb yield criteria were used to reflect the mechanical properties of mylonite. A three-dimensional refined geological modeling analysis method based on multi-platform collaboration was then established for pile foundation sites. Using ABAQUS finite element software, the deformation, stress and failure modes of pile foundations and surrounding rocks under different bridge load levels were studied to analyze the safety of pile foundations in fault zones and summarize their ultimate bearing characteristics, providing a theoretical basis for designing pile foundations in fault zones.
