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对典型涵洞的路涵过渡段路基土体的冻结特征展开监测,并分析路涵过渡段路基及其下地基土的冻结特征和时空变化过程及其对路基稳定性的影响。结果表明,涵洞的存在使得台后路基冻结深度约为天然场地最大冻结深度的2倍,同时涵顶和涵底的冻结时刻和融解时刻均较涵侧要早;涵洞间接充当了通风管道的作用,减弱了路基的阴阳坡效应差异;涵洞的存在对其周围路堤的温度场有明显的影响,其显著增大了涵顶、涵侧填料温度随气温变化的幅度。通过对路涵过渡段土体冻结特征的监测分析,为涵下地基处理和路涵过渡段的路基填料选择及铺设方式提供参考。
The freezing characteristics of the subgrade soil in the culvert transitional section of culverts and culverts are monitored. The freezing characteristics and the temporal and spatial variation of subgrade and subsoil in the transitional sections between the road and culvert are analyzed and their influences on subgrade stability are also analyzed. The results show that the existence of culverts makes the freezing depth of subgrade more than twice as large as the maximum frozen depth of natural site, meanwhile the freezing moment and melting moment of culvert and culvert are earlier than that of culverts. Culvert indirectly acts as ventilation pipe , Weaken the difference of yin-yang slope effect of subgrade; the existence of culvert has a significant effect on the temperature field of the embankment around it, which significantly increases the amplitude of the culvert roof and culvert side filler temperature changing with temperature. By monitoring and analyzing the freezing characteristics of the soil in the transitional section between road and culvert, this paper provides a reference for the selection of subgrade fillings and laying ways for subgrade treatment and road-culvert transition.