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温度边界是冻土工程模拟中重要的边界条件之一。依据青藏公路多年冻土段不同走向路基断面表层温度的连续观测数据,分析了青藏工程走廊内路基实测的边界温度特征。结果表明:走向为W8°S的断面阴阳坡温差最大为5.81℃,走向为W34°S的断面坡面温差为5.68℃,走向为W86°S度的断面坡面温差为1.38℃,说明高原上无论路基走向如何,路基两侧坡面都存在温度差异,因此,两侧必须采取差异设计,以减少路基温度的不对称。同时,根据路基接收太阳能辐射反演路面及边坡表面温度,提出了工程热边界的简化计算模型,并将模型计算结果与实测数据进行对比,两者吻合较好。
Temperature boundary is one of the important boundary conditions in the frozen soil engineering simulation. According to the continuous observation data of the surface temperature of the subgrade in the permafrost section of the Qinghai-Tibet Highway, the measured boundary temperature characteristics of the subgrade in the Qinghai-Tibetan corridor are analyzed. The results show that the maximum temperature difference between the Yin and Yang slopes of W8 ° S is 5.81 ℃, the temperature difference between the W34 ° S section and the W86 ° S section is 5.68 ℃ and 1.38 ℃, Regardless of the direction of the subgrade, there are temperature differences on both sides of the roadbed. Therefore, differential design must be adopted on both sides to reduce the asymmetry of subgrade temperature. At the same time, a simplified calculation model of engineering thermal boundary is proposed according to the solar radiation retrieved by subgrade and surface temperature of slope, and the calculated results are in good agreement with the measured data.