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结合季节冻土地区实际气候条件,基于第II类与第III类混合热边界条件,模拟季节冻土地区路基温度场变化规律,分析阴阳坡面温度差异;在考虑冻结锋面位置和形状基础上,引入土体的冻胀率和融沉系数,研究由阴阳坡温度差异引起的公路路基变形发育过程,揭示路基破坏机理。研究结果表明:在有地下水源的情况下,坡向不同而引起的阴阳坡温度差异对季节冻土地区路基横向不均匀变形影响较大;在冻结过程中靠近阴坡的路肩与坡脚变形较大,在融化过程中阴坡边坡顶部处的沉降最大,冻结和融化过程中边坡及靠近阴坡侧路基顶部均易产生张拉破坏。因此,季节冻土地区公路路基在设计与养护时应特别考虑阴坡及靠近阴坡面的路肩,可在阴阳坡面采取不同的设计与养护措施减轻阴阳坡温度差异。
According to the actual climatic conditions in seasonal frozen soil region, the variation rule of temperature field in subgrade in seasonal frozen soil region was simulated based on the mixed thermal boundary conditions of Class II and III, and the temperature difference between the two slopes was analyzed. Based on the location and shape of frozen front, The frost heave rate and thaw settlement coefficient of soil are introduced to study the deformation process of highway embankment caused by the difference of temperature between yin and yang slope and to reveal the failure mechanism of subgrade. The results show that in the case of groundwater source, the difference of temperature between the Yin and Yang slopes caused by the different slopes has a greater influence on the lateral inhomogeneous deformation of the embankment in seasonal frozen soil area. The deformation of the shoulders and foot near the shady slope In the process of melting, the settlement of the shady slopes at the top of the slopes is the largest. During the freezing and thawing process, the slopes and the top of the side subgrade near the shady slopes are prone to tension failure. Therefore, in the design and maintenance of seasonal embankment, the shady slope and the shoulder near the shady slope should be specially considered. Different design and maintenance measures can be taken on the yin-yang slope to alleviate the difference in temperature between the yin and Yang slope.