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基于国道214不同试验路段的地温监测资料,对沿线沥青、水泥路面下路基的浅层温度差异、年平均温度差异及路面对路基温度的影响深度等进行了分析,并根据分析结果开展模拟分析。结果表明,沥青路面与水泥路面下路基浅层温度差异存在着明显的季节性差异。路面类型对路基下多年冻土的影响深度基本在路面下8 m以内。通过模拟分析得出了相同条件下沥青和水泥2种路面类型下路基融化核形成的时间差异,路基下最大融化深度随路基运营时间和路基高度的变化规律,以及沥青和水泥2种路面下多年冻土最大融化深度的差异及其发展规律等。可以根据研究结果提出一些有效的措施来保持路基的热稳定性。
Based on the ground temperature monitoring data of 214 national highway sections, the shallow temperature difference, the annual average temperature difference and the influence depth of roadbed on the subgrade temperature along the asphalt and cement pavement along the road are analyzed, and the simulation analysis is carried out according to the analysis results . The results show that there are obvious seasonal differences in the shallow layer temperature difference between the asphalt pavement and the cement pavement. The influence of pavement type on subgrade permafrost is basically within 8 m below the road surface. Through the simulation analysis, the time difference of subgrade melted nuclei under asphalt and cement under two kinds of pavement types under the same conditions was obtained. The maximum melted depth under subgrade changed with subgrade operating time and subgrade height, and asphalt and cement under two kinds of pavement for many years The difference of maximum thawing depth of frozen soil and its development law. Based on the research results, some effective measures can be put forward to keep the thermal stability of roadbed.