青藏工程走廊楚玛尔河高平原区路基边界温度特征

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.

Boundary temperature features of the embankment in Qumar River region along the Qinghai-Tibet transportation engineering corridor

Based on the observation of surface temperature (5-cm in depth) at K2968.2 of the Qinghai-Tibet Highway in Qumar River region on the Tibetan Plateau, the regression equations of the boundary temperature are fitted, and the differences in thermal state between south-facing and north-facing slopes of the railway and highway embankments are analyzed. It is revealed that the boundary temperature regression equation has high fitting degree, which can be used to numerically simulate the frozen soil embankments. The monitoring section of highway and railway embankments shows significant differences between south-facing and north-facing slopes. The temperature difference between the left and right slopes of the highway is 11.49℃ in winter, and its annual mean value is 4.77℃. The temperature difference between right and left embankment toes reaches 5.34℃ in winter, with an annual mean of 3.33℃. The difference between the mean annual original surface and air temperatures is 5.2℃. Looking from Freeze/thaw n-factors, with a lower freezing n-factor and a higher thawing n-factor, the south-facing slope exhibits an endothermic behavior; on the contrary, the north-facing slope shows exothermic effect. However, in the north-facing slope, there is a larger freezing n-factor, resulting in exothermic effect. There is basically the same changing tendency of solar radiation and temperature change on embankment slopes.