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Reasonable Height of Roadway Embankment in Permafrost Regions

机译:多年冻土区公路路堤的合理高度

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摘要

Many researches and engineering practices about the Qinghai-Tibetan Highway have proved that the thermal stability of the roadbed is the key problem of the roadway stability in permafrost regions. Beginning with the concept of critical heights of roadway embankment in permafrost regions, we conducted an in-situ experiment along the Qinghai-Tibetan Railway and a series of numerical analysis about the reasonable heights of roadway embankment on the Qinghai-Tibetan Plateau. The main conclusions are as follows: (1) the in-situ experiment shows that the rise of permafrost table under the embankment is not in proportion to the increase of embankment height. When the embankment is higher than 4m, the rises of permafrost table decrease with increasing embankment height. (2) the numerical analysis illustrates that, under the condition of mean annual air temperatures (MAAT) at -3.0, -3.5, -4.0, -4.5℃, respectively, the minimum embankment heights for asphalt pavement should be 8.24, 5.32, 3.11, 1.67m, and the maximum embankment heights should be 2.79, 3.4, 3.71, 3.99m; otherwise, the minimum embankment heights for gravel pavement should be 1.84, 0.55, 0.42, 0.42m, and the maximum embankment heights should be 3.42, 3.90, 4.13, 4.39m. (3) the critical values of MAAT for the existence of the critical embankment heights are -3.9℃ for asphalt pavement and -2.8℃ for gravel pavement.
机译:关于青藏公路的许多研究和工程实践证明,路基的热稳定性是多年冻土区道路稳定性的关键问题。从多年冻土区路堤临界高度的概念开始,我们沿青藏铁路进行了现场试验,并对青藏高原路堤的合理高度进行了一系列数值分析。主要结论如下:(1)现场试验表明,路堤下多年冻土层的上升与路堤高度的增加不成正比。当路堤高于4m时,随着路堤高度的增加,多年冻土台面的上升幅度减小。 (2)数值分析表明,在年平均气温分别为-3.0,-3.5,-4.0,-4.5℃的条件下,沥青路面的最小路堤高度应为8.24、5.32、3.11。 ,1.67m,最大路堤高度应为2.79、3.4、3.71、3.99m;否则,砾石路面的最小路堤高度应为1.84、0.55、0.42、0.42m,最大路堤高度应为3.42、3.90、4.13、4.39m。 (3)存在临界路堤高度时,MAAT的临界值为沥青路面为-3.9℃,砾石路面为-2.8℃。

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