Abstract: In seasonally frozen regions, the frost heave and thaw settlement of high-speed railway embankments play a decisive role in the safety and stability of railways. Using the frost heave deformation monitoring of a specific railway embankment in a seasonally frozen area as the research subject, the deformation monitoring and data analysis were conducted throughout the entire freeze-thaw process. The study obtained the variations in the embankment’s temperature field, freezing depth, and frost heave over time and space. Detailed surveys were also carried out in key areas of frost heave deformation, obtaining the moisture content and fine particle content at different interfaces of the embankment. Through the in-depth analysis of the monitoring data, the study revealed that the primary factors influencing the freeze-thaw deformation of this railway embankment in the seasonally frozen area are water content and fine particle content. It was found that areas with higher water content and greater fine particle content exhibit significantly increased frost heave. Based on the research results, specific recommendations for improving embankment design and reinforcement measures were proposed. The findings of this study provide a scientific basis for the construction and maintenance of high-speed railways in seasonally frozen areas, contributing to enhanced railway safety and stability.

Key words: Railway Subgrade, Frost Heave Deformation, Water Content, Fine Particle Content, Reinforcement Measures