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基于青藏高原楚玛尔河地区青藏公路里程K2968+200断面浅层地温监测数据(地表下5 cm),拟合了边界温度的回归方程,分析了公路路基及铁路路基两侧表层温度的特征.同时对路基坡面温度和理论辐射值的相关性进行了分析.结果表明:边界温度回归方程拟合程度较高,可作为冻土路基数值模拟温度边界选取的参考依据;监测断面公路和铁路路基都表现出显著的阴阳坡差异,公路左右坡面冬季温度差异达11.49℃,年均值差4.77℃,冬季铁路路基左右坡脚温度差异达到5.34℃,年均值差3.33℃,天然地表与气温的差值为5.2℃;根据融化与冻结n系数,位于阳坡一侧的冻结n系数较低且融化n系数大,表现为吸热;阴坡一侧冻结n系数较大,整体呈现出放热效应;路基边坡太阳理论辐射与温度变化趋势基本一致.
Based on the monitoring data of shallow ground temperature (KCM) at the K2968 + 200 section of the Qinghai-Tibet Highway in the region of the Chumar River in the Qinghai-Tibet Plateau, the regression equation of the boundary temperature is fitted and the surface temperature characteristics of the roadbed and both sides of the railway subgrade are analyzed. The correlation between slope temperature and theoretical radiation value is also analyzed. The results show that the regression equation of boundary temperature has a high degree of fitting and can be used as a reference basis for numerical simulation of temperature boundary in permafrost embankment. Monitoring section highway and railway embankment The difference between winter and winter slopes was 11.49 ℃ and 4.77 ℃ respectively. The temperature difference between the left and right foot of winter railway subgrade reached 5.34 ℃ and the annual average difference was 3.33 ℃. The difference between natural surface temperature and air temperature The value of which is 5.2 ℃. According to the coefficient of thawing and freezing, the freezing n coefficient at the side of the sunny slope is lower and the coefficient of melting n is larger, which shows endothermic. On the one side of the shady slope, the freezing n coefficient is larger and the whole shows the exothermic effect. Subgrade slope sun theory radiation and temperature trends are basically the same.