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中文摘要：
考虑相变和全球气温升高的影响，采用有限差分法FLAC3D软件，对新建兰新铁路第二双线季节性冻融段的路基稳定性进行了研究。通过建立路基模型，选取适当的模拟计算参数、边界条件、初始条件、处理相变及求解方法，对考虑相变情况下路基温度场和变形场进行数值分析。分析表明，相变作用对路基温度场的影响很大；高度为4．2m的路基发生冻胀时，路面的相对变形较小，而路肩的相对变形较大，在距离坡脚约1m处会有很大隆起变形，路基的稳定性受到较大影响。
英文摘要：
Considering the phase-changes and influence of the global temperature rising and using the FLAC3D software of the finite difference method, this paper studies on the subgrade stability of seasonal frozen-thaw section of the second line in new Lanzhou-Urumqi Railway. Through establishing the subgrade model, selecting the suitable simulation parameters, the boundary cbndition, the initial condition, the methods for dealing with phase transitions and calculation, the numerical analysis of subgrade temperature field and deformation field with phase changing was carried out. Calculated result shows that phase change has a great impact on the subgrade temperature field. When frost heave occurs in the subgrade whose height is 4.2m, the relative deformation of road surface is small, and the relative deformation of road shoulder is large. There is large heave deformation about 1 m from the toe of roadbed, and the stability of the roadbed is affected greatly.
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