多年冻土区高等级公路路基温度场研究

Analysis of temperature field of high grade highway embankment in permafrost regions

在全球变暖的背景下,利用有限元法对多年冻土区高等级公路路基温度场进行数值模拟研究。分析路基高度分别为2.0,3.0,4.0,5.0和6.0 m时路基高度与路基下方冻土上限的关系,分析路面宽度分别为14.0,16.0,18.0,20.0和24.0 m时路面宽度与路堤内和基底融化夹层面积的关系。研究结果表明:在影响路基下方多年冻土上限和融化夹层面积的各因素(路基高度、边坡坡度和路面宽度)中,路基高度对冻土上限的影响程度最大,路面宽度对路基内和基底融化夹层面积的影响最大;冻土路基在20 a的设计使用年限内合理高度为4.26 m;冻土路基在不采取"冷却地基"措施的情况下,在20 a的设计使用年限内,路面最大宽度为6.0 m;当路面宽度为12 m时,分幅路基的合理间距为35.3 m。

Using the finite element method, the temperature field of high grade highway embankment was simulated and analyzed taking into account of climate warming. The relationship between the permafrost table and the embankment heights of 2.0, 3.0, 4.0, 5.0 and 6.0 m, respectively was studied, and the relationship between the thawing interlayers and the pavement widths of 14.0, 16.0, 18.0, 20.0 and 24.0 m, respectively was also researched. The results show that the height of embankraent has the largest influence on the permafrost table and the width of the pavement has the largest influence on the thawing interlayer inside the embankment and basement among the factors impacting on the stability of the embankment. In order to satisfy the service life of 20 a, the reasonable height of the embankment is 4.26 m. The maximum width of the pavement is 6,0 m without the cooling roadbed methods, When the pavement width of the separated embankment is 12.0 m, the reasonable distance between the separated road beds is 35.3 m.