边界条件对多年冻土路基热稳定性的影响分析

发布时间：2018-06-23 21:14

  本文选题：青藏工程走廊 + 冻土路基　； 参考：《冰川冻土》2014年02期

【摘要】：多年冻土区的年平均气温是影响冻土路基边界条件的重要因素.在附面层原理的基础上,考虑采用带有相变的控制方程和数值方法,以相同尺度的路基模型为前提,选取不同的年平均气温为影响因素,对青藏工程走廊公路路基的人为冻土上限和年平均地温进行了研究.结果表明:公路路基下年平均地温随着年平均气温的升高而升高,人为冻土上限随着年平均气温的升高而显著下降.在年平均气温为-7.16℃时,路基修筑50 a后其年平均地温为-3.61℃,其人为冻土上限为-0.97 m;年平均气温为-3.21℃的条件下,路基修筑50 a后其年平均地温仅为-0.1℃,其人为冻土上限也降至-13.11 m.因此,可以看出:在未来气候持续变暖的背景下,现有处于稳定状态的冻土路基将逐渐变得不稳定.
[Abstract]:The annual mean temperature in permafrost regions is an important factor affecting the boundary conditions of permafrost subgrade. On the basis of the principle of boundary layer, the governing equation with phase transition and numerical method are considered. Based on the subgrade model of the same scale, different annual mean temperature is chosen as the influencing factor. The upper limit of artificial permafrost and the annual mean earth temperature of highway roadbed in Qinghai-Xizang project are studied. The results show that the annual mean ground temperature of highway roadbed increases with the increase of annual mean temperature, and the upper limit of artificial frozen soil decreases significantly with the increase of annual average temperature. When the annual average temperature is -7.16 鈩，

本文编号：2058458