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在多年冻土区,道路工程建设会引起下伏冻土吸热融化,进而威胁上部工程稳定性,这一冻土问题是多年冻土区工程建设面对的重要问题.对于青藏高速公路而言,由于铺设高吸热性的沥青路面和路基幅面增宽引起的尺度效应,路基吸热量较普通路基将大幅增加,使得其冻土问题更为突出.基于此,利用数值仿真手段,考虑全球气候变暖背景,对宽幅路基修建完成后20 a的热状况进行预测研究和比较分析,阐明了宽幅面沥青路面热效应对下部土体热状态的影响及其与路基边坡水平热效应的综合贡献,比较分析了全幅修建和分幅修建条件下下伏冻土热状态的异同.研究成果将为多年冻土区高速公路的路基稳定性研究和建设模式等提供基础理论指导.
In permafrost regions, road construction will cause the permafrost to melt under the permafrost so as to threaten the stability of the upper part of the project, which is an important issue in the construction of the permafrost region. , Due to the scale effect caused by the laying of high heat-absorbing asphalt pavement and widening of subgrade width, the heat absorption of subgrade is greatly increased compared with ordinary subgrade, making the problem of frozen soil more prominent.On the basis of numerical simulation, The background of climate warming is studied and comparatively analyzed on the thermal conditions of 20 a after the construction of wide subgrade is completed. The effect of wide-area asphalt pavement thermal effect on the thermal state of lower soil and its combination with the horizontal heat effect of subgrade slope are expounded And make a comparison and analysis of the similarities and differences of the thermal state of underburden under the condition of full-scale construction and sub-construction.The research results will provide the basic theoretical guidance for the research and construction mode of the subgrade in the permafrost expressway.