Abstract: Based on analyzing the essential characteristics of the stability situation of current Qinghai-Tibet railway slope embankment in permafrost regions, and combining the study status quo of calculation and analysis method for stabilities, a method is put forward practically, which analyzes and calculates the stability of slope embankment from both thermal and mechanical aspects respectively and gives a comprehensive evaluation about it. Through analyzing and calculating an on-site typical cross-section, it can be seen that: ①For the slope embankment of which thermodynamic properties show a dynamic variation, that analyzing its most unfavorable conditions could be in line with the actual results of its stability. ②When slope embankment is at the thermal steady state, its mechanical stability may be presented unstable situation. Therefore, to get a more comprehensive and in line with the actual conclusion, it is needed to analyze its stability from the two aspects of thermal and mechanics. This method is simple in principle, and the result is clear, and it also is of important guiding significance to analyze and evaluate the stability of slope embankment in permafrost regions during the operational phase.

Key words: Qinghai-Tibet railway, permafrost, slope embankment, stability analysis