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结合青藏铁路实际工程及有关测试数据的研究结果表明:青藏铁路多年冻土区路堤人为上限的主要影响因素依次为气温与年平均地温、填料类别、路堤高度、坡向与风、施工季节等。气温对路堤人为上限的影响是通过路堤表面温度的向下传播实现的;年平均地温作为一个冷源,在下方自下而上对人为上限也起着一定的影响作用。粗颗粒土作为填料可以满足路堤人为上限抬升的基本传热学条件;合理高度范围内,路堤高度与人为上限抬升值之间正相关;东西走向的路堤易于形成上凸型不对称的人为上限,南北走向的路堤易于形成上凸型对称的人为上限。暖季施工的路堤在基底地层中形成了高温夹层,影响了路堤地温场的恢复。
According to the actual project of Qinghai-Tibet Railway and related test data, the results show that the main influencing factors of man-made upper limit of embankment in Qinghai-Tibet Railway are the temperature and average ground temperature, packing type, embankment height, aspect and wind, construction season and so on. The influence of air temperature on the embankment’s artificial upper limit is achieved through the downward spread of the surface temperature of the embankment. The annual mean ground temperature, as a cold source, also plays a role in influencing the artificial ceiling from the bottom up. Crude granular soil as filler can satisfy the basic heat transfer conditions of embankment artificial upper limit elevation. Within the reasonable height range, embankment height is positively correlated with the man-made upper limit lift value. The east-west embankment tends to form an upward convex asymmetric artificial ceiling, The south-north embankment tends to form an artificial upper limit of convex symmetry. Embankments constructed in warm season form a high-temperature interlayer in the basement, affecting the restoration of the ground temperature field.