青藏铁路多年冻土区斜坡路堤的稳定性分析

Stability analysis of Qinghai-Tibet railway slope embankment in permafrost regions

通过分析目前青藏铁路多年冻土区斜坡路堤稳定性状况的本质特点,结合目前稳定性计算分析方法研究现状,切合实际地提出了从热学和力学两方面分别进行分析和计算,并综合评价斜坡路堤稳定性的方法。通过现场典型断面的计算分析可以看出:①对于热力学属性呈动态变化的斜坡路堤,分析其最不利状况可以得到符合实际的稳定性状况结果;②当斜坡路堤处于热学稳定状态时,其力学稳定性也可能呈现不稳定情况,所以需要从热、力学两方面共同分析其稳定性才能得到较为全面的符合现场实际的结论。此方法原理简单、结果明确,对于多年冻土区斜坡路堤在运营阶段的稳定性分析和评价具有重要的指导意义。

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.